List of 44 Bitcoin fork tokens since Bitcoin Cash

Abstract: Although in 2018 Bitcoin may have somewhat moved on beyond this issue, in this sixth piece on consensus forks and chainsplits, we provide a list of 44 tokens which seem to have forked away from Bitcoin since the Bitcoin Cash split.

(Source: gryb25)

From late 2015 to the end of 2017, there was significant focus and analysis in the Bitcoin community about a chainsplits, finally resulting in the launch of Bitcoin Cash and then a plethora of other tokens. We have already covered some of topics related to these splits, in the five articles below:

In this sixth piece we list 44 Bitcoin forked tokens.

List of Bitcoin forked coins since Bitcoin Cash

Name URL/Source Fork Height
Bitcoin Cash https://www.bitcoincash.org 478,558
       Bitcoin Clashic http://bitcoinclashic.org (Forked from Bitcoin Cash)
       Bitcoin Candy http://cdy.one (Forked from Bitcoin Cash)
Bitcoin Gold https://bitcoingold.org 491,407
Bitcore https://bitcore.cc 492,820
Bitcoin Diamond http://btcd.io 495,866
Bitcoin Platinum Bitcointalk 498,533
Bitcoin Hot https://bithot.org 498,777
United Bitcoin https://www.ub.com 498,777
BitcoinX https://bcx.org 498,888
Super Bitcoin http://supersmartbitcoin.com 498,888
Oil Bitcoin http://oilbtc.io 498,888
Bitcoin Pay http://www.btceasypay.com 499,345
Bitcoin World https://btw.one 499,777
Bitclassic Coin http://bicc.io 499,888
Lightning Bitcoin https://lightningbitcoin.io 499,999
Bitcoin Stake https://bitcoinstake.net 499,999
Bitcoin Faith http://bitcoinfaith.org 500,000
Bitcoin Eco http://biteco.io 500,000
Bitcoin New https://www.btn.org 500,100
Bitcoin Top https://www.bitcointop.org 501,118
Bitcoin God https://www.bitcoingod.org 501,225
Fast Bitcoin https://fbtc.pro 501,225
Bitcoin File https://www.bitcoinfile.org 501,225
Bitcoin Cash Plus https://www.bitcoincashplus.org 501,407
Bitcoin Segwit2x https://b2x-segwit.io 501,451
Bitcoin Pizza http://p.top 501,888
Bitcoin Ore http://www.bitcoinore.org 501,949
World Bitcoin http://www.wbtcteam.org 503,888
Bitcoin Smart https://bcs.info 505,050
BitVote https://bitvote.one 505,050
Bitcoin Interest https://bitcoininterest.io 505,083
Bitcoin Atom https://bitcoinatom.io 505,888
Bitcoin Community http://btsq.top/ 506,066
Big Bitcoin http://bigbitcoins.org 508,888
Bitcoin Private https://btcprivate.org 511,346
Classic Bitcoin https://https://bitclassic.info 516,095
Bitcoin Clean https://www.bitcoinclean.org 518,800
Bitcoin Hush https://btchush.org 1st February 2018
Bitcoin Rhodium https://www.bitcoinrh.org Unknown
Bitcoin LITE https://www.bitcoinlite.net Unknown
Bitcoin Lunar https://www.bitcoinlunar.org Unknown
Bitcoin Green https://www.savebitcoin.io Unknown
Bitcoin Hex http://bitcoinhex.com Unknown

(Source: BitMEX Research, Forked coin websites, findmycoins.ninja)

Please note it is very important to handle these new fork tokens with caution. In particular, we would strongly advise you not to import your Bitcoin private key into any new fork token wallets without first spending the Bitcoin to a new output associated with a different private key after the token snapshot point, so that your Bitcoin is not at risk.

 

 

BitMEX Downtime, May 17 2018

Today, May 17, 2018, the BitMEX trading engine encountered several separate and heretofore unpredictable problems, causing feed latency and downtime in spurts throughout the day.

Disks mounted to the main trading engine hardware degraded sharply in performance at roughly 10:00 UTC. This degradation caused feed latency during scheduled archive and reindex jobs, which caused significant backpressure. Disk I/O operations were running at roughly 1/20 of their expected rate.

BitMEX runs redundant drives, but in this case, both drives were simultaneously exhibiting this degraded behavior. We had no choice but to schedule a maintenance downtime to replace them. Unfortunately, backpressure reached critical levels faster than we expected and we moved up our timetable.

At no point was data integrity compromised by this problem, but restoring the machine to a functional state with nominal disk performance took longer than expected to execute and verify.

After this action was complete, we restarted trading. Unfortunately, another problem was uncovered during the next archive, where a reindex job combined with a previously rare request pattern led to unexpected index regeneration and symbol revalidation on specific tables. This led to another backpressure scenario, with similar symptoms.

We have identified and fixed multiple contributing factors to the above behavior. The trading engine team will be closely monitoring engine performance throughout the day while continuing root cause analysis for the slowdowns.

Why UPs?

BitMEX is proud to launch its first optionality products: UPs and DOWNs. This marks a very significant milestone in the product development history of the platform. With futures, swaps, and now options, BitMEX is inching closer to the goal of offering all manner of derivative products for the crypto-coin industry.

Why UPs and DOWNs?

UPs or Upside Profit Contracts, and DOWNs or Downside Profit Contracts are similar to call and put options. One of our biggest strengths at BitMEX is in engaging with the community and listening to our customers, and we have heard the roar for such products as the level of sophistication grows in this industry.

Why Now?

The liquidity profile of Bitcoin derivatives trading has changed dramatically over the past 12 months. The BitMEX XBTUSD Perpetual Swap is now the most heavily traded instrument in the entire crypto trading industry. Average daily trading volumes are in the billions of USD notional.

Before non-linear products like options are viable, linear products (Perpetual Swaps and Futures) must be sufficiently liquid. Given the liquidity profile of XBTUSD and the quarterly Bitcoin / USD futures contracts, we now believe there is sufficient liquidity in order to launch a successful options product.

What’s the Use Case?

Imagine Bitcoin is currently trading at $10,000 and you believe that by the end of the week, it will move 10% higher to $11,000. However, you don’t want any exposure to the price unless it hits your target. Also, you do not want your position to be liquidated before your target is reached, irregardless of the intra-week spot movements. For example, if the price drops to $5,000 but recovers to $12,000 by the settlement date, you will still profit and will not be liquidated.

Hence, you want the ability to participate above your target of $11,000 on the long side. The UPs product allows you to express this view, however this “optionality” comes at a cost which is the premium you pay to the seller of the option.

Why Can You Only Buy?

Selling naked (i.e. unhedged) options is one of the fastest and easiest ways to financial ruin given the potential for unlimited losses. On BitMEX, traders are limited to the margin they deposit on the platform, hence if the seller of the option cannot make good on potential losses, then socialised loss systems will need to be put in place which we want to avoid. As a result, we require sellers of the options to post the full notional value of the UP or DOWN contract.

Because no leverage is offered to sellers, it is very expensive from a capital perspective to make a market. In order to guarantee tight spreads at sufficient size, the BitMEX affiliated anchor market maker will be the only entity allowed to sell options initially.

Many of you may have concerns that the BitMEX affiliated entity is the sole market maker, however here are some points to consider:

  1. As further discussed below, one cause of the engine overload issue is that we have many market makers constantly updating quotes on currently listed products. This consumes a vast amount of precious engine capacity. Until our engine performance is fixed, we refrain from listing any new product that exacerbates the issue. (E.g. this is one of the reasons why we delisted a number of our quarterly altcoin futures contracts, since the volumes they generated did not justify the engine resources consumed.) Hence, if only one market maker quotes on the UPs and DOWNs product, then the impact will not be meaningful on the engine.
  2. The UPs and DOWNs products need to be fully margined. That is, buyers must pay the premium in full and sellers must post the full notional of the option in margin. That means that irregardless of where the price settles, neither buyers nor sellers will ever be liquidated. If the contract settles in the money, buyers are assured they will always receive their profit. Furthermore, this means that the anchor market maker cannot manipulate the UP or DOWN market in any way to liquidate any customer. 
  3. The anchor market maker is tasked with keeping a tight market so that buyers can enter and exit trades as they wish throughout the contract’s length. We want to increase liquidity, having wide markets or an empty order book is not in BitMEX’s interest.
  4. As we respond to customers’ feedback about the products, changes will be made to the UPs and DOWNs contracts. The anchor market maker will be able to adjust to the new product structure faster than any third party. That means that we can fail fast, and relaunch the product quickly with guaranteed liquidity.

What Are We Doing About Engine Performance?

At BitMEX, our top priority is improving the performance of our engine. In a detailed blog post, BitMEX Technology Scaling: Part 1, our CTO Samuel Reed explains in detail the issues we face and what we are doing to resolve these issues. However I will reiterate some points here.

The solution is not as simple as adding more servers or more engineers. The engine has a maximum throughput that is constrained by risk checks and calculations which are performed on each order, position, trade or price change so that we can maintain mathematical consistency on a platform that allows for 100x leverage. We have a two-pronged strategy to solve for this unique problem that BitMEX experiences:

  1. Optimise as many existing functions as possible to obtain efficiency gains. We have been rolling out improvements weekly; however, that extra capacity is consumed very quickly as the demand increases to match engine performance improvements.
  2. Re-architect the engine from the ground up so that the aforementioned issues can be scaled horizontally which will allow for more products and more users without overload issues. This work is ongoing, it won’t be solved overnight, but we are working towards this goal.

I want to emphasise that we will not list any products that worsen engine performance until we increase capacity sufficiently.

Additionally, we are scrutinizing which API users cost us the most in resources. Further API rate limits on traders with non-optimal Quote / Trade ratios are forthcoming. I remember how hard I fought as a CEO to convince traders to provide liquidity on our platform. This action pains me deeply and further sharpens my focus on finding a solution to this problem so that anyone who desires to provide liquidity may do so.

Launching the UPs and DOWNs products does not mean that BitMEX has forgotten or ignored the overload issue. Rather, we must continue to launch and test new products within reason so that in a year’s time we have another wildly successful product like XBTUSD.

If you are a talented engineer who believes he or she has a solution to this problem, we want to hear from you / hire you. Please reach out to us via the careers page or email, and a senior member of staff will review your qualifications or suggestions.

– Arthur Hayes, CEO and co-founder

BitMEX Market Making Desk

We have recently updated our Terms of Service to explicitly clarify the relationship between BitMEX the trading platform, and an affiliated entity that engages in market making.

ToS Update

BitMEX has a for-profit trading business that, among other things, transacts in products traded on the BitMEX platform.  The trading business primarily trades as a market maker. The trading business is organised to be separate and distinct from the platform business. Specifically, no front office personnel are shared between the trading business and the platform, the trading business operates from a separate physical location, and the trading business does not have access to any platform order flow, execution, customer or other information on terms that are not otherwise available to any other platform user. In addition, unless otherwise set forth in the terms of a specific BitMEX product, the trading business receives access and trading privileges only on the same terms as are available to any other user.

Why Market Make?

Early on we discovered that market makers are very fickle. They only want to invest the time connecting to a trading platform that already has flow. What they don’t want to do is try out a new exchange where they must expend resources connecting only to have no takers. Given trades must be collateralised, this reduces their returns.

In order to entice others to provide liquidity, we funded an entity that would quote as soon as a new product listed. As the product became more liquid, this entity would scale back it’s quotes and focus on another product with lower liquidity on the BitMEX platform.

Right now the activity of this affiliated entity is concentrated on the altcoin contracts. XBTUSD and the quarterly Bitcoin / USD futures contracts have plenty of liquidity, and new market makers join every day to beef up those orderbooks. Mission accomplished … for now.

Being able to immediately support a new and illiquid product allows us to experiment with products that other platforms without an anchor market maker cannot. It also speeds up the process to obtaining other 3rd party liquidity providers.

How Do We Align Incentives?

The trading entity is a for-profit operation. However, their earnings are comprised of a service fee paid by the business, that is the BitMEX trading platform. In terms of trading PNL, the market making desk’s goal is to be breakeven.

If the desk is making too much trading PNL, the business will instruct them to tighten spreads and increase size. As a franchise, BitMEX succeeds because of greater trading volumes, not because of the market making desk’s trading PNL.

The market making desk earns the most if the exchange earns the most. That also means that dishonest and manipulative behaviour on the part of the market making desk is not tolerated. As you saw mentioned, the desk sits in a separate physical location. They also have no better information or access than any other trader on BitMEX. If traders feel that the platform is not fair, they will leave, and no one will get paid.

Our lead outside counsel is fully aware of the operation and advises us on best practices to ensure that we place the interests of BitMEX customers first.

What Activities Does The Desk Engage In?

The primary trading activity is providing two-sided liquidity on selected BitMEX products. The desk’s current focus is on increasing the liquidity on the altcoin contracts. The desk will also be the anchor market maker for the UPs and DOWNs products.

The desk also trades OTC with various counterparties globally.

As mentioned earlier, the desk does not engage in manipulative behaviour. The desk does not front-run customers. The desk does not manipulate either the market on BitMEX or the underlying exchanges for the purposes of stop loss hunting, or causing cascading margin calls.

None of this behaviour has occurred in the past, and if such behaviour is discovered, those responsible will be terminated immediately for cause.

Who Runs The Desk?

The head trader is Nick Andrianov. He is a former Deutsche Bank equity flow and exotics options trader. Nick and I have known each other for over ten years. His integrity is unquestionable.

Nick receives the business objectives from various senior members of BitMEX. The business and the market making desk work closely with the express goal to make every single BitMEX product as liquid as possible.

Financial Risks

Trading losses incurred by the market making desk will not affect the solvency of the BitMEX trading platform.

As stated above, the market making desk sits within a separate entity. Their goal is to provide liquidity to BitMEX and the wider crypto capital markets.

– Arthur Hayes, CEO and co-founder

BitMEX Technology Scaling: Part 1

Hi there – I’m Samuel Reed, CTO of BitMEX.

It’s been an incredible journey over the last four years building BitMEX. When we started, I don’t think any of us could have imagined the success this platform would achieve or how it would come to dominate Bitcoin/USD trading in 2018.

From 2014 to today, the BitMEX platform has grown from zero to an average of $3B of trading volume per day. Our flagship product, XBTUSD, trades more than any crypto product in the world. We serve customers all over the world, in five languages, and have become the premier platform for Bitcoin price discovery and liquidity.

The BitMEX team has been hard at work improving capacity, building a solid mobile offering, and creating a tech team that is truly best-in-class. We are not resting on our laurels, enjoying this success for the sake of it. Quite the opposite: we’ve been busier than ever.

We’d like to let the community in on how we formed and how we’re moving forward. As was wisely said: “In order to defeat the bug, we must understand the bug”1


I’ll begin with a true story.

Source: russellfreeman.com

In 2014, I was speaking at a web development panel in Hong Kong for General Assembly, a coding bootcamp. They wanted to give their soon-to-graduate students a taste of what it was like to work professionally. I took the opportunity to talk about my history: a career made of positions in several small businesses, startups, and government – with an emphasis on how incredibly in-demand software engineers are.

A rather loud personality in the back asked a question: “How do cash-poor startups looking for a CTO make a case? How do you attract great talent in such a competitive atmosphere?”

“Well, that’s a good question, and a tough answer,” I said. “Without funding, you have the challenge of a serious risk versus a sure thing. Why should any experienced developer forgo $200,000 or more at a large tech company, in a comfortable, resource-rich environment, to work 80 or more hours a week? You essentially have to find some bozo” – I really said this – “who believes in your idea so much he’s willing to take the risk despite so many better options.” I wished him good luck and we continued the panel.

He came up to me after the panel and told me he wanted to do a Bitcoin derivatives exchange. I knew then: I was that bozo, and Arthur Hayes and I were to become business partners.

Without any major funding, we brought an alpha online within six months and started with the BitMEX Trading Challenge, an no-rules trading competition where we put the exchange through its paces. And it really was no-rules (aside from multiple accounts) – hacking the site would win you the prize. We paid out a few Bitcoin in bug bounties in those days but we didn’t have any major failures.

Much to the annoyance of my wife, we launched BitMEX on during our honeymoon in Croatia, on November 24, 2014. Ben and Arthur celebrated separately, in Hong Kong. Notice the original trading interface in both photos. You can still read the original Trollbox messages from that day.

November 24, 2014, Dubrovnik, Croatia.
November 24, 2014, Hong Kong.

 


All projects are a product of the time in which they are built. In early 2014, the crypto ecosystem was reeling from the vacuum Mt.Gox left behind. The focus at the time was not “proof of work” vs. “proof of stake”, as it is today, but a forgotten term called “proof of reserves” – just Google it and look at the timestamps of all the popular posts. In fact, a question about this was the top-voted comment on our Reddit launch announcement.

The first rule of running a Bitcoin exchange is, and always has been, “Don’t lose the Bitcoin.”

This rule pervades everything we do at BitMEX. It permeates our policy, even today: we still use a 100% cold wallet where every transaction is multisig. Look up a 3BMEX transaction on the blockchain, and you’ll see it. For 1,250 straight days (!), at least two out of the three of us have gotten up, read the day’s withdrawals, done our risk checks, and signed, to be passed onto the next partner for signing and eventual broadcast.

At the time, I thought users would resist this. Yes, Bitcoin is better in so many ways than any monetary system that has come before it. But it is weaker too. Custodianship is an unsolved problem that requires constant vigilance. I think our customers know this and appreciate it. In our early days, we received a large number of complaints about withdrawal times. Today, where we are the largest exchange by volume in the world, we receive barely any. People get it – caring for your deposits this way is not easy. We do it not because it is convenient, but because it is safe.

BitMEX in 2014.

2014 also influenced how we built BitMEX. My frontend experience lead me to adopt ReactJS and made BitMEX the first exchange to launch with it, a choice that has paid dividends well into 2018.

We were also the first – and likely still the only – exchange to ever build our matching and margining engine on kdb+/q, a technology traditionally used for querying of large-scale time-series data. It’s a natural fit. It’s fast (bear with me), using SIMD instructions to greatly boost throughput, it’s flexible, and it’s accurate. Kdb+’s flexibility and speed allowed us to pivot our product offerings twice: from low-leverage inverse and quanto futures to high-leverage ones, and from high-leverage futures to our flagship product, the XBTUSD Perpetual. This required flexibility, innovation, and a lot of sweat equity from everyone on the team, and we’re so proud of how far it’s come.


Now, it wouldn’t be fair to come this far without addressing the title of this post. BitMEX now trades as much as US$6.5 billion per day. Our most recent 1-minute record was US$35 million, a number that is higher than the entire month of April 2016.

The highlighted month, March 2016, had 16M of volume on XBTUSD. XBTUSD now peaks at double that in just one minute.

The following charts show monthly turnover in increasingly large timescales, to highlight detail completely lost in the overall view:

To understand why BitMEX is experiencing slowdowns, despite using a solid technology like kdb+, it’s important to understand what BitMEX does differently than other exchanges.

100x is a number that elicits a large number of reactions, ranging from “are you crazy?” to “how is this possible?” It is only possible due to incredible financial engineering from our co-founder and CSO Ben Delo. Ben is a diligent and brilliant mathematician. He built a perfect mathematical model for trading, a constantly-coherent system that continuously audits all trades and always sums to zero. Transactions don’t get lost in the BitMEX engine. A user’s balance never goes negative. There are entire classes of bugs that are common on other platforms that never occur on BitMEX, and it is that attention to detail that makes all the difference. Mark/Fair Pricing, the weighted ADL system, perpetual contract funding rates, and live isolated/cross remargining are all new, novel concepts that did not exist before BitMEX.

This consistent coherency inside the BitMEX engine makes 100x possible. Kdb+ has historically been fast enough that we can continuously remargin all positions upon each and every price change. This provides the safety and speed necessary to not only survive within the razor-thin requirements of 0.5% maintenance margin, but thrive. The BitMEX Insurance Fund, a fund that guarantees settlement of BitMEX contracts, contains (at the time of writing) an incredible 6,149 XBT, over US$50M. Competing firms have insurance funds in the single digits of Bitcoin, despite offering as low as only 20x leverage.

BitMEX won’t sacrifice safety for speed. The security of our users’ funds and confidence in their trades is paramount. But we hear all of you: you want to trade faster, you want freedom from “System Overload” messages, and we will give that to you.

Since late 2017, the BitMEX team has refocused on engine performance as our highest priority. We have built, and are continuing to build, a team full of the top professionals in the space. This team works hard, building capacity for the next 100x increase in trading volume.


In the second part of this series, I’ll explain in-depth:

  • How the BitMEX engine processes orders and remargining
  • How real-time messages flow through our system to your browser
  • How BitMEX uses API-first design to provide the most powerful API in the business
  • Performance charts showing hot-spots, peak versus baseline load, and corner-cases
  • A breakdown of the dreaded “System Overload” message, and how it is generated

In the third part, I’ll also explain:

  • Performance numbers showing how capacity has increased since 2017
    • We have made large strides in the past months – but demand has increased to match
  • Roadmaps and pending work for Q2
  • BitMEX’s vision for the future of online derivatives trading

Thank you to all of you for being a part of BitMEX’s success. Ben, Arthur and I feel fortunate than to be a part of such a great company: our customers, team, and market opportunity are simply best-in-class.

Reach out to me directly on Twitter at @STRML_ and on Telegram at STRML. I also occasionally talk with traders on the Whalepool TeamSpeak, a fun community of traders that have given great feedback and encouragement to BitMEX for years.


A common sight from the window of the apartment where BitMEX was launched, in Dubrovnik.

1 – Starship Troopers was ahead of its time with its views on software development.

Funding Mean Reversions 2018

One of the most powerful and simple trading strategies is mean reversion. The XBTUSD swap features a funding rate that is exchanged between longs and shorts every 8 hours. The rate is calculated based the observed premium or discount of the swap over the spot index from the previous 8 hours. The lag between observation, announcement, and payment of funding gives this rate predictive power.

The intent of the funding rate is to entice traders to take the counter-trend position. If the market is falling, those trading with the trend will pay funding (shorts). If the market is rising, those trading with the trend will pay funding (longs). The trend is your friend until it ain’t. Anecdotally traders notice that the funding is elevated in absolute terms directly preceding a turn in the market’s direction.

Last September I presented a simple mean reversion funding strategy. If funding is high in positive terms, short XBTUSD right before funding is charged. Receive the funding payment, then cover the short position 8 hours later. If the funding is high in negative terms, go long XBTUSD right before funding is charged. Receive the funding payment, then close the long position 8 hours later. Depending on your criteria for when you put on this trade, there is a historically positive profit.

Armed with slightly longer than one year’s worth of data (March 2017 to April 2018), I have calculated the historical returns for this strategy. The trading triggers happen at one and two standard deviations away from the mean on the positive and negative side. The below are the results:

Sigma – This is the number of standard deviations away from the mean.

Count – For negative funding, this is the number of observations where the funding rate is below or above the Sigma for negative and positive funding rates respectively.

% Passes – This is the percentage of observations in the Count sample set where if the Sigma is negative, the next log 8-hour return is positive; or if the Sigma is positive, the next log 8-hour return is negative.

Cumulative Funding – This is the total amount of funding received from the observations in the Count sample set. If the Sigma is negative you will be going long XBTUSD and receiving funding. Therefore, even though the Cumulative Funding is listed as negative, you will receive this as income.

Cumulative XBTUSD Return – This is the sum of the next log 8-hour return of observations in the Count sample set.

Cumulative Return – This is how much you will earn from this mean reversion strategy. That is the funding income net of the return from the XBTUSD trades.

% of Total Observations – [Count / Total Number of Observations]

The most profitable range in this simplistic study is between the one and two Sigma absolute ranges. That fundamentally makes sense. If the funding is at the maximum, the counter-trend trade will very likely blow up in your face as the trend continues. Bitcoin, as readers know, is a very emotional market. The highs go higher and lows lower.

As the funding moderates during an extended rally or dump, that is when the tide is most likely to change. And that is when placing a counter-trend trade which receives the funding and direction change is the most profitable.

The more sophisticated statisticians amongst us can concoct much more advanced and nuanced mean reversion strategies centred around the XBTUSD funding rate. The data for the analysis I conducted are all freely available via our public API. This study is yet another proof that plenty of juice remains in the Bitcoin market for cool-headed analytical traders.

The Crypto Hangover

After a December to remember, crypto took a rough ride in the paddy wagon called the markets. The volatility was glorious, but for many, the gyrations negatively impacted their PNL. Bloodied traders, hedge funds, and ICO issuers litter the information highway. The El Dorado of uncorrelated returns still entices many to continue their journey in this new and exciting industry.

2, But No 20

Every day my LinkedIn inbox was filled with at least one new person announcing they were opening a crypto hedge fund. Various media outlets reported that by the end of Q1, a few hundred registered crypto hedge funds existed.

The vast majority of these funds are long only. Meaning these fund managers are overpaid beta chasers. Nothing wrong with the beta, but when you fool yourself into thinking you produce alpha, disastrous results ensue.

The investors who gladly handed over thousands and sometimes millions of USD, now stare at scarlet numbers that would make Hester Prynne proud. As I check in with some of my hedge fund manager friends, the fundraising process is going slower than expected.

The second class of slightly more sophisticated fund managers expected to arbitrage their way into Steven Cohen’s league. These managers proved more successful; however, some learned that your risk management in the crypto markets better be airtight or you will get REKT. All manner of bad luck greeted their lackluster returns. The inability to manage margin requirements on spread trades is one sure way to destroy a spread trade.

All in all, many newly minted John Paulson wannabe’s learned that it wasn’t so easy to trade crypto. The markets were volatile, seemingly random, and did not “behave” as they should or had.

ICO, A Dream Deferred

Every tech team now needs an ICO strategy. If the un-washed public will hand you hundreds of thousands of Ether on nothing more than a slick website and a plausible whitepaper you have to take their un-dilutive money. The flood of ICOs continues unabated, most of the 2017 vintage deals now trade below their ICO price.

I firmly believe that the ICO is a revolutionary way to fund technology projects. And the ICO should allow anyone with an internet connection and a few Satoshi or Ether to participate in the success of a project. However, the ICO has morphed into a private-placement orgy.

The ICO deals have gotten bigger, which necessitated the creation of the Sale of Future Tokens (SAFT) monstrosity. Teams bypass the small individual investors who used to participate in public ICO issuances for private deals conducted through SAFTs. Telegram has raised over $2 billion via SAFTs issued to professional investors. Good on them, but we should not consider that a real ICO.

Traditional VC investors love the SAFT because it closely resembles the traditional Series Alphabet soup. The SAFT achieves the liquidity event very quickly, meaning they can dump their paper on retail investors in the secondary market. However, there is just too much token toilet paper for the market to absorb. The ICO market slumped and took its god Ether with it.

Many newly minted token investors will find that without the support of retail, they are just passing a hot potato along Sand Hill Rd. Unfortunately for their bonuses, these hot potatoes are marked to market almost immediately and could end up costing them percentage points of returns.

This is not an “ICOs are dead” market call, but rather for ICOs to regain their former glory, they need to go back to basics. The teams that can say no to SAFT, and actually launch a fair and widely distributed public token sale, will revive the market. There are still projects that will do extremely well, but most of these tokens are and always will be dog turd.

Trading All Markets

The financial media loves crypto; there’s pathos and a cast of very interesting characters (I’m loving Brock Pierce’s hats). Readers searching for the next get rich quick investment devour any and all crypto coverage. PSA: if you need to read Bloomberg to figure out what happened in crypto, don’t quit your non-crypto day job.

There are any number of reasons why the market plunged from $20k to $6k in Q1. US tax-related selling, regulatory FUD, the ICO slump, weak hands capitulating, are all plausible reasons. These combined with the simple fact that an asset that goes up 20x in one year is certainly due for a meaningful correction.

No financial reporter will accept the simple reason that nothing goes up or down in a straight line. There must always be a reason, and they print all manners of gobbledygook if it sounds plausible to their editor.

The best crypto traders can trade both bull and bear, and furthermore both trending and choppy markets. However, I have encountered very few of these specimens. Most successful traders learn their style and if the current market structure doesn’t fit, they take a break.

The market is in chop mode. After $10,000 thunderously fell, the market traded in a $6k to $10k range. The beauty of Bitcoin is that the range is very large, and moves sudden. For disciplined traders, this chop is a gold mine.

For those who thought merely sitting in a Telegram chat room, or reading /r/bitcoinmarkets was sufficient to generate mad gains, SFYL. What keeps traders coming back to the market is that hard work is actually rewarded. This is truly the only real free asset market globally. That should excite any student of the markets, and student one must be if you want to drive a Lambo and order trains of Dom P.

P.S. If you don’t know what a train is, order one at the club, and watch your heart skip a beat when presented with the bill.

Onward to The Elysian Fields

Before one departs for the Hamptons, French Riviera, or Bali, another quarter awaits. Q1 was the carnage, Q2 will be the consolidation.

The regulators spooked us, the drops nuked us; but after all of that $5,000 was not breached. Bitcoin is still here, the markets are still volatile, and more people than ever before know what a cryptocurrency, digital token, and or ICO is. That is a net positive.

Many exchanges now have more registered users than the stock exchange in their domicile. The demand to trade these markets surpasses the capacity of exchanges. Crypto is not going anywhere, and those who are completely comfortable in the digital arena will continue to prefer crypto investments to equities and fixed income.

I don’t know where the price will be in the next three months, but my spidey sense tells me a sentiment shift is occurring. The next test will be $10,000. Can we hold, and for how long? Then the journey back to $20,000 can continue.

New Ethereum Miner Could be a Game Changer

Abstract

We look at Bitmain’s new Ethereum miner and notice that it may be less energy efficient than one might expect for an ASIC. We explore the possibility that this miner contains a new more advanced form of technology, which is less efficient than ASICs, but potentially partially immune to PoW algorithm changes. We then conclude that whether this particular Ethereum chip is capable of this or not, this type of technology may eventually end the era of anti-ASIC PoW changes designed to improve decentralisation, such that crypto-coin communities may have to accept the inevitability of ASICs.

Overview

Bitmain have recently launched a new Ethereum miner, widely believed to be an ASIC, and it is expected to ship in late July 2018. However, many in the Ethereum community oppose ASICs and prefer GPU mining, since GPU companies are primarily concerned with gaming rather than crypto-coins, which should mean that the hardware is distributed more widely and fairly, improving decentralisation. Therefore a risk to Bitmain could be that the Ethereum community decide to hardfork to change the PoW algorithm, which could devalue the Bitmain machines and result in a large wasted investment.

In this report, we speculate that Bitmain may already be one step ahead of the Ethereum community. Bitmain may have already learnt a lesson with Monero, two coins which recently conducted PoW changes, potentially resulting in large devaluations of Bitmain’s ASIC chips. Developing a custom chip requires a considerable financial investment and therefore we think Bitmain may have taken some countermeasures to avoid another loss. Bitmain could have designed a new type of mining chip, less efficient that ASICs, but immune to PoW changes. This could make an Ethereum hardfork PoW change mostly pointless.

The recent Monero anti-ASIC PoW change

At the start of April 2018 the Monero community decided to hardfork and change the PoW algorithm, in an attempt to “brick” ASICs and make Monero more GPU-friendly. Due to sharp increases in hashrate, illustrated by Figure 1 and 2 below, the Monero community believed that ASIC manufacturers had developed Monero ASICs, in secret, and were mining the coin.

As Figure 2 shows below, the rolling 90-day hashrate growth rate reached c. 300% in the early part of 2018 (based on 7-day rolling averages). Even after factoring in the sharp increase in value of the Monero coin, this is an extraordinary growth rate. After Monero developers announced plans for a hardfork, Bitmain began to sell Monero ASICs on their website, indicating that they could indeed have been mining in secret. After the PoW change, as Figure 1 shows, the Monero hashrate dropped off significantly.

After the hardfork, the Monero chain split into two, with the original rules coin being called Monero Original (XMO). Although this coin had a lower value than Monero, it had a higher hashrate, since there was little else for the Monero ASICs to mine. There was no replay protection implemented for the split, however Monero increased the ring signature limit, therefore one can split Monero and Monero Original by first initiating a transaction on the Monero Original chain with fewer ring signatures than are allowed on Monero (less than 7).

Figure 1 – Monero hashrate compared to Monero price

Source: Coinmarketcap, BitMEX Research

 

Figure 2 – Monero hashrate compared to Monero price – Rolling 90-day percentage growth of 7-day moving average

Source: Coinmarketcap, BitMEX Research

Note: In the 7 days following the PoW hardfork, the hashrate rolling average excludes the period prior to the hardfork

Bitmain’s new Ethash miner

As we mentioned above, Bitmain has recently launched a new Ethereum miner, which is expected to ship around late July 2018. Given the history with Monero and the fact that many in the Ethereum community, including those mining Ethereum at home on GPUs, are likely to be unhappy at a new Bitmain product, Bitmain may be concerned. One downside to the new miner could be increased miner centralization, but in addition to this, the product may also receive hostility from some in the Ethereum community due to their financial interests in the existing Ethereum miners, GPUs. Bitmain’s management is not stupid, and therefore in our view the company is likely to act with caution and may have taken measures to mitigate against some of these risks.

Figure 3 – Bitmain’s new Ethereum miner: the Antminer E3

Specifications:

  • Power consumption: 800W
  • Hashrate: 180MH/s

Source: Bitmain

The advertised specification of the product is disclosed above. As the table below illustrates, a back -of-the-envelope calculation could imply this new Ethereum miner is less efficient than one would expect if it was an ASIC, based on comparisons with the efficiency gain measured on some of the other ASICs related to other coins. For instance a Bitcoin ASIC is c. 521x more efficient than an FPGA, while the Monero ASIC is c. 88x more efficient than a GPU. In contrast the new Ethereum miner is only c. 1.4x more efficient than a GPU. This could indicate that the new Ethereum miner is not an ASIC at all, but merely a new device more efficient than the existing GPU miners. However, we appreciate that the below table is a crude approximation which ignores many crucial variables and factors, such as the memory-intensive nature of the Ethereum mining algorithm. But although the calculation is inaccurate, the figures can still potentially illustrate a point:

Figure 4 – Approximate miner efficiency calculations

Miner Hash rate (GH/s) Power (W) Energy per hash (J/GH)
Bitcoin (SHA256)
CPU 0.0005 100 200,000
High end GPU 0.5 300 600
FPGA 0.8 40 50
High end ASIC 14,000 1,340 0.096
Efficiency gain 521x
Ethereum (Ethash)
High end GPU 0.032 200 6,250
Antminer E3 0.18 800 4,444
Efficiency gain 1.4x
Monero (CryptoNight)
High end GPU 0.0000001 200 2,000,000,000
ASIC 0.000022 500 22,700,000
Efficiency gain 88x

Source: BitMEX Research, Bitmain
Note: Figures are approximations

Mining chip types & Vector processors (VPs)

As Figure 5 below illustrates, when Bitcoin launched in 2009, mining was conducted using CPUs. However, the architectures of GPUs and FPGAs are more efficient at processing repetitive hash operations. Therefore the network shifted, first to GPUs and then to FGPAs. In 2013, ASICs designed for specific hash functions emerged. Compared to CPUs, GPUs and FPGAs, ASICs are far more efficient at running a particular algorithm, however excluding this, ASICs are far less efficient or actually totally useless.

Figure 5 – Crypto-coin chip type timeline

Source: BitMEX Research
Note: The inclusion of Vector Processors (VPs) towards the end of 2018 is speculative

It might be possible that Bitmain has developed a new type of chip, a Vector Processor. The architecture of this chip could be designed for PoW hash functions in general, but not for a specific hash function. These chips could then be more efficient than GPUs and FPGAs, but less efficient than ASICs. The advantage over ASICs is that they could be, in some respects, immune to PoW changes. It is possible that the new Ethereum miner falls into this category of chip, although this is mostly speculation on our part.

Figure 6 – The evolution of crypto-coin chip types

Chip type Central Processing Unit (CPU) Graphics Processing Unit (GPU) Vector processor (VP) Application Specific Integrated Circuit (ASIC)
Example crypto-coins Bitcoin (BTC) – 2009 to 2011 Bitcoin (BTC) – 2012 to 2013
Ethereum (ETH),
Monero (XMR)

Ethereum (ETH) – 2018 onwards

Bitcoin (BTC) – 2014 to present,
Monero Original (XMO)

Manufacturers Intel,
AMD
NVIDIA,
AMD
Bitmain Bitmain,
Canaan Creative,
Ebang,
Innosilicon
Foundry

TSMC, Samsung,
Global Foundries, SMIC

TSMC, Samsung,
Global Foundries, SMIC
TSMC TSMC,
Samsung,
Global Foundries
Primary use Computing Gaming Crypto-coin mining Crypto-coin mining
Immune to PoW change Yes Yes Potentially No

Higher efficiency

 

It is possible that Bitmain’s new Ethereum miner is tailored for Ethash, in that the components inside the miner such as the electric circuits, power control devices, memory and control modules could all be specifically calibrated for mining Ethereum. However the chip itself, which is the area that requires by far the most financial investment, could be more general and not specifically designed for Ethereum. Therefore if Ethereum conducts a PoW change, it could be possible to direct the chips into a new device as they leave the foundry or perhaps even recover the chips from the old device put them into a new Ethereum miner. Although again, at this point we are speculating.

Artificial Intelligence (AI) technology

At TSMC’s latest set of quarterly results on 19th April 2018, Co-CEO Mark Lie said the following:

[Bitmain] is doing a lot of things on blockchain technology, like AI. They are doing very well. We expect them to slowly move to the AI area.

Source: Q1 2018 earnings call

“AI” is a term with many meanings. Although at this point the situation is unclear, it is possible that any new Vector Processor chips could be what TSMC mean by AI technology. Since any such chip may be able to switch between hashing algorithms, at a stretch, one could argue this falls within the scope of AI. It remains to be seen if the chip is merely programmable, like modern GPUs, or if there is a trick up its sleeve that could give it an efficiency gain vs. GPUs in most cases. If present, this advanced technological capability is likely to be seen as a major achievement for Bitmain. Such technology may also be even more expensive to develop and more specialised than the technology in ASICs, which could make the decentralisation problem even worse.

Ethereum hashrate growth – No evidence of deployment of the new chips

Despite the above, we have not yet seen any strong indications of the deployment of the new chips on the Ethereum network. As Figures 7 and 8 below indicate, Ethereum’s hashrate appears, broadly speaking, to be following a normal trend given the price volatility.

Figure 7 – Ethereum hashrate compared to Ethereum price and NVidia GPU sales

Source: Bloomberg, Etherscan.io, Coinmarketcap, Nvidia, BitMEX Research

 

Figure 8 – Ethereum hashrate compared to Ethereum price – Rolling 90-day percentage growth of 7-day moving average

Source: Bloomberg, Etherscan.io, Coinmarketcap, BitMEX Research

Conclusion

When discussing the possibility that Bitmain’s new Ethereum miner isn’t an ASIC and that the new chip may be somewhat immune to PoW changes, Vitalik Buterin told us:

I have a very similar impression myself

Despite what we have said above, most of the content in this article should be considered guesswork. However, even if we are wrong about this particular chip, we still think it is reasonably likely that at some point in the future, Bitmain or another company, will develop a general-purpose hashing chip, which is more efficient than GPUs for almost all hashing algorithms. At this point the era of anti-ASIC PoW changes could be over, with crypto-coin communities having to make a choice between two potentially unfavourable outcomes:

  1. Allowing ASICs, or,
  2. Allowing general purpose hashing chips, where technologies and production capabilities could be even more concentrated.

Unless of course proof-of-stake systems prove robust enough.

 

Disclaimer

Whilst many claims made in this note are cited, we do not guarantee accuracy. We welcome corrections.

 

A Note on Recent ETH Liquidations

At 02:22 UTC on April 15, 2018, the ETHBTC on Poloniex crashed approximately 18% from 0.063 to 0.052. The Poloniex price is used as 100% of the index price (.ETHXBT30M) for the ETHM18 contract.

Crypto trading is very risky and underlying prices are highly volatile. While this type of movement is unexpected and undesirable, the price on BitMEX accurately reflected the price on the underlying spot market throughout this crash and recovery. Due to BitMEX systems functioning as expected and according to specification, there will be no refunds of losses sustained due to liquidations.

Index stability is important to us. BitMEX will continue to evaluate if adjustments are needed to existing index compositions. The liquidity of crypto spot markets is constantly in flux and can change significantly over the lifetime of a quarterly contract. Poloniex hosts one of the most liquid ETHBTC markets (note, not ETHUSD) in the world, but this unexpected action has triggered an internal re-review.

The Index Price is used as the central calculation for marking BitMEX futures. This Mark Price is used for margin calculations, which trigger liquidations. More information is available here.

Complete guide to Proof of Stake – Ethereum’s latest proposal & Vitalik Buterin interview

Abstract

In this piece we examine proof of stake (PoS) consensus systems.  We look at their theoretical advantages and weaknesses. We then analyse the specific details of some of the most prominent and novel PoS systems attempted thus far, where we learnt that some pure PoS systems becomes increasingly complex, to the point which they became unrealistic. We review the latest Ethereum proposal, which we think is a significant improvement compared to previous attempts and it could provide net security benefits for the Ethereum network. However, the system may still be reliant on proof of work (PoW), which is still used to produce the blocks and at this point it is not entirely clear to us if the PoS element of the process contributes to ensuring nodes converge on one chain.

Introduction

Before diving into the specifics of Proof of Stake (PoS), it’s important to clarify what one is trying to achieve when building these consensus systems. Essentially one is trying to construct a data structure with the following properties:

  1. No one entity controls the content of the data (distributed storage and verification of the data is not sufficient);
  2. The database can move forward, (Casper terminology: “Liveness”); and crucially
  3. Participants agree on the content of the data i.e. nodes have a mechanism to decide between conflicting valid chains (Casper terminology: “Safety”)

PoW uses the most accumulated work rule to decide between competing valid chains (fork choice rule). This is not only an apparent solution to criteria three above, but the PoW mechanism also inherently solves the block production and block timing issue. While total accumulated work is the fork choice rule, a block producer is also required to include an element of PoW in each block, a stochastic process, and therefore the issue of who produces each block and when each block is produced, is also be addressed by PoW.

PoS is the general concept of a fork choice rule based on the most accumulated stake (i.e. the chain with the most coins backing, voting or betting on it). However, unlike PoW, this does not necessarily directly address the issue of who produces each block or when blocks are produced. Therefore these issues may need to be addressed by alternative mechanisms. PoW is also a solution to the coin distribution problem, something which may also require an alternative solution in PoS based systems.

Theoretical overview of PoS

The byzantine generals problem

The Byzantine generals problem illustrates some of the  main challenges involved when attempting to construct a data structure with the properties mentioned above. Essentially the issue is about timing and how to determine which updates to the ledger occurred first. Actually if one third or more of the actors are disruptive, the problem is provably unsolvable, from a mathematical standpoint, as Leslie Lamport proved in 1982.

It is shown that, using only oral messages, [reaching agreement] is solvable if and only if more than two-thirds of the generals are loyal; so a single traitor can confound two loyal generals

Source: The Byzantine Generals Problem (1982)

PoW can therefore be considered as an imperfect hack, which seems a reasonably strong Byzantine fault tolerant system, but certainly not a mathematically robust one. It is in this context, of imperfect systems, which one should analyse PoS alternatives, as like PoW, these systems will also have flaws.

In PoS there are two competing philosophies. One of which is derived from PoW. Coins based on this include Peercoin, Blackcoin and earlier iterations of Ethereum’s PoS proposals. The second philosophy, is based more on Lamport’s academic research from the 1980s and embraces the conclusion Lamport reached that a two-thirds majority is required to build a Byzantine fault tolerant system. Ethereum’s current iteration of the Casper proposal adopts this second approach.

Advantages of PoS

PoS is typically looked at in the context of PoW, as an alternative which solves or mitigates against negative externalities or problems inherent in PoW based systems:

More environmentally friendly

Perhaps the most widely cited advantage of PoS systems is the absence of the energy intensive process which PoW requires. If PoS based systems can achieve the same useful characteristics as PoW systems, environmental damage can be avoided. This is a significant positive for PoS, although as we discussed in our piece on Bitcoin’s energy consumption, the problem may be slightly overstated, due to the incentive to use lower cost or otherwise failed energy projects as a source of power, limiting environmental damage.

Stronger alignment of incentives

Another major problem with PoW based systems is that the interest of miners may not align with that of coin holders, for example miners could sell the coins they mine and then only care about the short term, not long term coin value. Another issue is that hashrate could be leased, with the lesee having little or no economic interest in the long term prospects of the system. PoS directly ties the consensus agents to an investment in the coin, theoretically aligning interests between investors and consensus agents.

Mining centralisation & ASICs

Another key advantage of PoS based systems is potentially improving decentralisation. PoW mining has a number of centralising forces which are not applicable to PoS:

  • ASIC production is expensive and centralised (In Bitcoin Bitmain has a high market share);
  • Chip foundries are expensive and centralised (TSMC, Intel, Samsung & SMIC are the only players with scale);
  • ASIC related technologies can potentially be patented;
  • There may be a limited number of cheap energy sources, with restricted access; and
  • Many aspects of mining can have economies of scale, such as maintenance costs and energy costs, resulting in centralisation.

General and economic weaknesses of PoS

An incomplete solution

As we alluded to above, Satoshi’s PoW systems appears to kill four birds with one stone:

    • Chain selection (the fork choice rule),
    • Coin distribution,
    • Who produces blocks, and
    • When blocks are produced.

PoS only appears to be a proposed solution to the chain selection problem, leaving the other problems open. Although these other issues could be less significant than the chain selection issue.

An “unfair” economic model

One of the most common criticisms of PoS systems is that they allocate new funds in proportion to the existing holdings. Therefore the “rich get richer” and it results in a few wealthy users holding a higher proportion of the wealth than the more egalitarian PoW alternative. If one invests in a PoS system at the start, you can maintain your share of the wealth, alternatively in a PoW system your wealth is diluted as new rewards are distributed to miners. Indeed, if rewards are allocated in proportion to the existing holdings, one could argue its not inflation at all and that the reward is economically equivalent to adding more zeros to the currency. Therefore one can even claim the reward system is pointless and does not provide an incentive at all. However this only applies if all users become PoS validators, while in reality some users will want to use the funds for other purposes.

Risk of a loss of funds

Another issue is that staking requires signing a message from a system connected to the internet. Therefore stakers are required to have a “hot wallet” which increases the risk that funds are exposed to theft from hackers. Although it may be possible to mitigate this downside by having a private key only entitled to stake for a short period of time, after which the balance reverts back to the owner. Although if there is a slashing rule (punishment for voting on two conflicting chains), a hacker could conduct action which destroys the funds even if this mitigation strategy is used. Another potential mitigation strategy could be the creation of specialist hardware for staking.

Technical & convergence weaknesses of PoS

Nothing at Stake

Core to the consensus problem is timing and the order of transactions. If two blocks are produced at the same time, PoW solves the problem by a random process, whichever block is built on top of first can take the lead and then miners are incentivised to build on the most work chain. PoW requires energy, a finite real world resource and therefore miners have to decide which chain to allocate this resource to.

In contrast this process in PoS based systems is not entirely clear. If two blocks are produced at the same time, each conflicting block can build up stake. Eventually one block may have more stake than the other, which could make it the winner. The problem here is that if stakers are allowed to change their mind to back the winner, such that the system converges on one chain, why would they not use their stake on multiple chains?

After-all stake is a resource inherent to the chain and not linked to the real world, therefore the same stake can be used on two conflicting chains. Herein lies the so called “Nothing at stake” problem, which we view as the most significant issue facing PoS.

The “Nothing at Stake” problem

The Nothing at Stake problem Stake does not add to the convergence of the system, since the same stake can be applied to multiple competing chains, which is a risk free way of stakers increasing their rewards. In contrast, in PoW based systems, energy is a real world finite resource and therefore the “same” work cannot be applied to multiple competing chains.
Defense 1 The issue can be avoided or mitigated against. The protocol can be adjusted such that if a staker uses the same stake on multiple chains, a third party can submit a proof of this to either chain, resulting in a punishment, such as the confiscation of the stake (slashing conditions). Alternatively instead of a punishment, the cheater could lose potential rewards or be excluded from the staker pool.
Response from PoS sceptic The above defence is inappropriate and punishes what may be legitimate or necessary behavior. For example if a staker receives a block first, while the majority receives an alternative block first, it may be legitimate for that staker to change their mind and switch to follow the majority. Indeed the process of changing your mind and switching to the majority to ensure the network converges is the point of the consensus system. If this behavior is punished, how does the system converge?

Either the economic value of the punishment is higher than the rewards for switching to follow the majority, or it isn’t. Therefore the nothing at stake problem means PoS systems can never make a contribution to system convergence and the idea is therefore fundamentally flawed.

Defence 2 The apparent dilemma above can potentially be  resolved in various ways. For instance:

  • Earlier proposals from Casper used multiple rounds of staking. Changing one’s mind in the early rounds can be legitimate and perhaps the punishment is small, while in later rounds the punishment for using the same stake in multiple competing chains increases, such that eventually users have a high degree of assurance over the finality of the system.
  • The most recent iteration of Casper aims to allow validators to change their minds, but only in “legitimate” scenarios and not when its “illegitimate”.
Response from PoS sceptic By adding multiple rounds or criteria in which validators can change their minds one is increasing the complexity of the system. This is merely adding layers of obfuscation to conceal the inherent weaknesses illustrated by the nothing at stake problem, without solving the fundamental issue.
Defence 3 No system is perfect, indeed it’s mathematically impossible to construct a perfect system and therefore the nothing at stake problem is not solved, however the measures identified above mitigate the problem, such that these theoretical issues are unlikely to apply in the real world.

The long range attack consensus problem

Another potential issue with PoS is the so called “long range attack” problem. This is the idea that attackers could, for instance, buy a private key which had a large token balance in the past and then generate an alternative history from that point, awarding oneself more and more rewards based on PoS validation. Due to the large amount of rewards given to the attacker, one could then generate a higher stake chain than the existing chain and a large multi year chain re-organisation could be performed.

The solution to this problem is checkpointing, which is the process of locking in a certain chain state once a certain stake threshold has been met, such that it can never be re-organised. Critics argue that this solution requires one to keep their node online at all times, since an offline node cannot checkpoint. Some claim that if one goes offline, the security model therefore degenerates to “ask a friend”, since one is dependent on asking others for their checkpoints. Although in the past the Bitcoin reference implementation included checkpoints, the purpose of these was to speed up the initial sync, although the impact of this could be said to result in an “ask a friend” security model.

However, in our view this is a matter of different priorities. If one wants each individual user to fully verify all the rules and the state of the system, then relying in these checkpoints is insufficient. Indeed, the Satoshi’s original vision appears to imply that the ability of nodes to be switched off and then verify what happened when was was gone is potentially important:

Nodes can leave and rejoin the network at will, accepting the proof-of-work chain as proof of what happened while they were gone

Source: Bitcoin Whitepaper

Although the ecosystem is expanding, many businesses and exchanges operate 24×7 and are therefore required to keep a node running all the time, and can therefore do checkpointing. There are strong incentives preventing them from allowing a large chain re-organisation. To many, this is sufficient security and the risks posed by the long range attack problem are therefore irrelevant or too theoretical.

Stake grinding

In a pure PoS system, stakers also need to produce blocks. These systems have often worked by selecting a sequence of authorised block producers randomly from a pool, where the probability is proportional to the stake. The issue here is a source of randomness is required inside the consensus system. If the blocks themselves are used for generating the entropy, stakers could try to manipulate the content in blocks in order to allocate themselves future blocks. Stakers may then need more and more computing power to try more and more alternative blocks, until they are allocated a future block. This then essentially results in a PoW system.

In our view, the stake grinding problem is less of a fundamental problem with PoS, when compared to significant issues like the nothing at stake problem. All that is required to solve this problem is a source of entropy in the network and perhaps an Ethereum smart contract like the RanDAO, in which anyone can participate, can solve this problem.

 

Case Studies – Peercoin & Ethereum’s Casper

1 – Peercoin – 2012

Overview

Peercoin is a hybrid PoW and PoS system, built on the idea of coin age. The fork choice rules is the blockchain with highest total consumed coin age.

Coin age is simply defined as currency amount times holding period. In a simple to understand example, if Bob received 10 coins from Alice and held it for 90 days, we say that Bob has accumulated 900 coin-days of coin age

Source: Peercoin Whitepaper

In Peercoin, some blocks were produced purely using PoW, whilst other blocks were produced using PoW where the difficulty adjusts based on the coin age destroyed by the miner in the transaction (the coinstake transaction as opposed to a coinbase transaction). “For example, if Bob has a wallet-output which accumulated 100 coin-years and expects it to generate a [PoS block] in 2 days, then Alice can roughly expect her 200 coin-year wallet-output to generate a [PoS block] in 1 day.

Analysis

Weakness Summary
Nothing at Stake The protocol aims to prevent miners using the same coins in a coinstake transaction on multiple chains by ignoring the second conflicting chain. However this is not sufficient and can result in nodes diverging, if they receive the conflicting blocks in a different order.
Block production Solved by using PoW to produce the blocks
Long range attack This was a critical vulnerability for Peercoin, an attacker can simply save up coin age by not spending their coins and then launch a re-organisation attack.

This was solved by centrally broadcasting checkpoints several times a day. Peercoin was therefore a centralised system.

Stake grinding This may not have been an issue, since there was no selection from a validator pool as PoW was always required and coin stake altered the PoW target.

Conclusion

At the time Peercoin was an interesting early novel approach, however the proposal resulted in a centralised system, not able to match the properties of PoW.

2 – Ethereum – Caper full PoS system – 2015

Overview

This is a full PoS proposal, based on “consensus by bet” methodology.

  • Blocks are produced from a pool of block producers, a random number generator is used to select whose turn it is to produce a block and then the producer is given a time window in which they can produce a valid block.
  • There is a set of bonded validators, one must be in the set to make or take bets on blocks.
  • Validators can then make or take bets on block propositions, providing a probability each time, representing the return betters can make.
  • After several rounds of betting, as the probability approaches 1 or 99%, the block is considered final.

Source: Ethereum Blog

Betting strategy

According to the Ethereum blog, betting should occur using the following strategies by default:

  • If the block is not yet present, but the current time is still very close to the time that the block should have been published, bet 0.5.
  • If the block is not yet present, but a long time has already passed since the block should have been published, bet 0.3.
  • If the block is present, and it arrived on time, bet 0.7.
  • If the block is present, but it arrived either far too early or far too late, bet 0.3.
  • Some randomness is added in order to help prevent “stuck” scenarios, but the basic principle remains the same.

The default betting strategy had a formula (given below), to push the probability away from 0.5, such that the chain would move forward, with the probability expecting to either approach zero or one.

Let e(x) be a function that makes x more “extreme”, ie. pushes the value away from 0.5 and toward 1. A simple example is the piecewise function e(x) = 0.5 + x / 2 if x > 0.5 else x / 2

If a validator bets when the probability is 99%, the return is very small (a 1% return used as a measure from which the reward is calculated), in contrast a winning bet placed placed with odds of 0.5, represents a return of 100%, which results in a higher return from the rewards pool.

The fork choice rule then is the sum of all the weighted probabilities, which have crossed a certain threshold, say 0.99. For instance a chain of five blocks, each with a probability of 1 will represent a score of 5. Any validator who changes their mind after the 0.99 threshold has been crossed, can be punished (slashed) for staking on multiple chains. While changing your mind before the threshold is considered legitimate and there is no punishment in that scenario.

Analysis

In our view, this proposal is highly complex, which we consider as the main downside.

Weakness Summary
Nothing at Stake The protocol aims to prevent miners using the same coins to bet on multiple chains by using a punishment mechanism, in which validators would lose their deposit. In our view, this could harm the convergence of the system, although betting formula may move the probability away from 0.5, which is designed to help mitigate the issue.
Block production The RanDAO contract could be used to provide entropy to select the block producer. However, this only provides a time window in which blocks could be produced, it is possible there is a lack of consensus over whether the block was produced within the time window or not, after which the betting process is supposed to resolve the dispute.
Long range attack The nodes checkpoint blocks once a certain probability threshold has been reached. The long range attack problem remains for periods in which nodes are switched off.
Stake grinding The RanDAO contract may solve the stake grinding issue

Conclusion

The proposal was not adopted by Ethereum. In our view the proposal was never complete, as some parameters and aspects of the system lacked a specification. Although the consensus by bet approach was interesting, it seemed too complex and there were too many uncertainties. This approach illustrates the difficulties involved when constructing full PoS systems and how when one tries to address the weaknesses, it just results in more and more complexity, until the system becomes unfeasible.

3 – Ethereum – Latest version of Casper – The hybrid PoW/PoS System – 2018

Overview

The current Casper proposal represents a change in philosophy or a pivot, compared to some of the earlier PoS systems. It returns to the academic work of Lamport in the 1980s and Lamport’s theorem that these systems work if and only if two-thirds of agents in the system are honest. Therefore the current version of Casper is less ambitious than before. PoS is no longer used to produce blocks or decide on the timing of blocks, which is still done by PoW miners. The PoS system is used as a checkpointing process. In our view, this proposal is superior to the more complex earlier iterations of Casper.

The system works as follows:

  • The PoS system is only used every 100 blocks, to provide an extra layer of assurance over PoW, as a checkpointing system.
  • Participants in the PoS process send their Ether into a “validator pool”.
  • Every 100 blocks validators put their stake behind a checkpoint block, whilst also referencing a previous checkpoint block. If two-thirds of the funds in the validator pool support a proposal, the block is considered “justified”.
  • Once a block is justified, it can be used as a reference for future votes. Once two-thirds of the stake use a justified block as a reference, this justified block is considered finalised and this finality takes precedence over PoW.
  • Validators votes are only valid 12 confirmations after the last checkpoint block.
  • If the two thirds threshold is not met, the chain continues to progress based entirely on PoW.
  • If stakers do any of the following banned behaviors, in return for a small 4% fee, a third party can submit a proof of this, such that the cheater loses their entire stake/deposit (slashing):
    1. Votes for multiple conflicting blocks at the same height.
    2. Votes for multiple conflicting blocks at different heights, but using conflicting reference blocks, unless the new reference block has more height.

The Ethereum reward structure will be adjusted, such that PoS validators also receive a share of the rewards, in addition to the PoW miners. As far as we can tell, the details of this new allocation have not been decided yet.

Analysis

The latest iteration of Casper is a significant improvement from earlier versions, in our view, primarily because of lower levels of complexity and greater reliance on PoW mining.

In theory, there are only three problems with the new proposal:

  1. Over one third of the stakers refusing to participate – in which case we are just back to a PoW based system
  2. Stakers changing their mind after finality such that more than two thirds supports an alternative chain – the long range attack problem
  3. Stakers reaching two-thirds majority support for a lower PoW chain than the current leading PoW chain, a new way of causing a re-organisation. We view this as the most significant downside of this proposal.

Core to the assumption behind this system is that its PoW which drives the chain forwards and that the PoS system only comes into play, once the PoW miners have decided on a chain, PoS votes are not even valid before 12 miner confirmations. Indeed, if the two thirds majority cannot be achieved then the chain continues on a PoW basis.

Therefore, we conclude, that the core characteristic of this latest Casper proposal is that the PoW happens first, and only after this does PoS potentially provide an extra assurance against a chain re-organisation, orchestrated deliberately by a hostile PoW miners. PoW therefore still provides computational convergence, with the PoS mechanism defending against the threat of a human threat of a miner re-organisation. Therefore although PoS provides this safety, as point three above indicates, it also provides extra risk, therefore its not clear if there is a net benefit.

Weakness Summary
Nothing at Stake Validators can vote on multiple chains, but not at the same height. This is designed to allow validators to change their mind, but only for “legitimate” reasons.

For the hybrid version of the model, the convergence issue may be solved by relying on PoW mining.

Block production PoW miners produce blocks and therefore there is no issue related to selecting the block producer.
Long range attack Once two-thirds of the stake in the validator pool has used a block as a reference for voting, nodes finalize the block and there cannot be a re-organisation. The long range attack problem remains for periods in which nodes are switched off.
Stake grinding PoW miners produce blocks and therefore there is no stake grinding issue.

Other potential unresolved issues

In the event of a contentious hardfork and chainsplit, if the new chain alters the format of the validator checkpoint votes, two-thirds of the validators could conduct destructive re-organisations on the original chain, while avoiding punishment (slashing) due to the new voting format. Validators could therefore destroy the original chain, while still moving forward on a new chain of their choice. The system could therefore be less resilient to being shut down.

Exclusive BitMEX Research Interview with Vitalik Buterin on the latest Casper proposal

Question 1 – Even though the PoS system may provide more assurance than before, prior to the 34% voting threshold being reached, re-organisation risk may be higher, since a re-organisation can occur in more ways, both via PoS and via PoW. Are you concerned about the negatives of this?

I would say no. There are plenty of reasons to believe that it should not negatively impact stability. The pre-finalization chain scoring rule is “highest finalized epoch + total difficulty * epsilon”. There is a paper here that points out that any “monotonic” chain scoring rule is a Nash equilibrium; our scoring rule is clearly monotonic so it’s a Nash equilibrium. Both miners and validators use the chain scoring rule, so miners and validators would both naturally help the chain grow, not try to revert it. Casper FFG was deliberately designed in this way, to “play nice” both with “chain-based” intuitions of consensus as well as BFT-theoretic concepts of finality.

 

The only way in which “re-organisation risk may be higher” is either:

 

  • If validators are more likely than miners to be majority-dishonest
  • If the Casper-specific code has bugs

We accept that if either of these are true then Casper FFG can add risks.

Question 2 – How do you expect users and exchanges to behave? Should exchanges modify their behavior before crediting deposits, for example 2 confirmations plus 34% of validator votes?

If I ran an exchange I would do something like “wait 12 confirmations for deposits up to $10k, and finality for anything higher”

Question 3 – Will there be an overall confirmation score metric, combining both the impact of PoW and PoS, which exchanges can use?

I suppose it’s possible to create one. Here are a few distinct stages of confirmation that I can think of:

  • A transaction has been included into a block, which is the head
    • which is the Nth ancestor of the head
    • which is an ancestor of a checkpoint C which is an ancestor of the head. Validators have started voting on C.
  • Validators have justified C.
  • A child of C, C’, exists, and validators have started voting on C’ to finalize C
  • The child of C’ has >1/3 votes. At this point, at least one validator needs to actually be slashed for the transaction to be revertedC is finalized.

Conclusion

This latest PoS proposal is the best proposal so far, in our view. We think it may be adopted by Ethereum and it could make a net positive contribution to the security of the system. However, the system remains reliant on PoW mining, at least at the interim stage. PoW is relied on to resolve any Byzantine faults first, before the PoS process occurs. Therefore the system relies on PoW for both block production and for the crucial property of ensuring the system converges on one chain. Although PoS mining may mitigate some risks (hostile PoW miners), it is unclear if it makes a net contribution to convergence or security. Critics of PoS could therefore argue that any rewards redistributed from PoW miners to stakers unnecessarily dilutes system convergence and security.

Although we think the current proposal could work, the nothing at stake problem could still be a significant challenge. The jury is still out on whether this new mechanism solves this problem. Therefore despite the plan to use this proposal as a stepping stone, as part of a gradual shift towards a full PoS system, this could be more difficult to achieve than some in the Ethereum community think.

 

Disclaimer

Whilst many claims made in this note are cited, we do not guarantee accuracy. We welcome corrections.

 

Changes to altcoin futures contracts

On 30 March 2018, we are making the following changes to altcoin products:

  • The 0.25% settlement fee will be removed on futures products. We hope that will encourage greater liquidity by removing barriers to entry and exit.
  • We will be removing the DASH, ETC, NEO, XMR, XLM, and ZEC pairs after they expire, for the time being. This is to free up trading-engine capacity on our more popular contracts. After we make certain optimisations, we may re-list these.
  • The ADA, BCH, ETH, LTC, and XRP contracts will be re-listed for another quarterly today:
    • BitMEX Cardano / Bitcoin 29 June 2018 futures contract (ADAM18)
    • BitMEX Bitcoin Cash / Bitcoin 29 June 2018 futures contract (BCHM18)
    • BitMEX Ether / Bitcoin 29 June 2018 futures contract (ETHM18)
    • BitMEX Litecoin / Bitcoin 29 June 2018 futures contract (LTCM18)
    • BitMEX Ripple / Bitcoin 29 June 2018 futures contract (XRPM18)

Bitcoin price correlation: Record high against the S&P 500

Abstract: We look at the price correlation between Bitcoin and some traditional financial assets since 2012 and notice that the correlation with stocks in the last few months has reached record high levels, although it remains reasonably low in absolute terms. We conclude that a crypto-coin investment thesis of a “new non-correlated asset class” may therefore have some merit, although correlations may increase if the ecosystem expands. Due to the current correlation with stocks, Bitcoin may no longer offer downside protection in the event of a financial crisis, which some people may expect.

Overview

We calculated the 180-day rolling daily percentage price-change correlation between Bitcoin and a variety of traditional financial assets since 2012. As the chart below demonstrates, the correlation never really significantly escaped the -0.2 to +0.2 range, which is a reasonably low level.

Bitcoin price correlation versus various traditional assets – daily price percentage change over a rolling 180-day period. (Source: BitMEX Research, Bloomberg, Bitstamp)

Bitcoin vs. the S&P 500 and gold

Focusing on just the S&P 500 index and gold, it appears as if Bitcoin has experienced several periods of correlation.

  • During the Bitcoin price rally in March 2013, which commentators at the time suggested was partially caused by the Cypriot financial crisis, the Bitcoin price correlation with gold increased and remained somewhat elevated until the January 2014 Bitcoin price crash.
  • During the 2016 Bitcoin price rally, a moderately strong gold-price correlation returned again and gold and Bitcoin both had a strong year. This indicates that the same underlying economic factors and political uncertainty (the economic slowdown in China, Brexit, and the election of President Trump) may have contributed to price movements of both assets during this period.
  • During the recent Bitcoin price rally, things appeared somewhat different, with the price correlation between Bitcoin and stocks reaching record levels (almost 0.25). In our view, Bitcoin appears to have obtained some “risk-on” characteristics in this rally. Increased levels of liquidity available to investors and the amount of enthusiasm for new technology, may be driving price movements in both stocks and Bitcoin, to some extent. Therefore Bitcoin may be less likely to provide protection in the event of a financial collapse or fall in equity markets, something traditionally considered one of Bitcoin’s potential strengths. In addition to this, the price correlation with gold recently became slightly negative.

Bitcoin price correlation between the S&P 500 index and gold – daily price percentage change over a rolling 180-day period. (Source: BitMEX Research, Bloomberg, Bitstamp)

Statistical significance

The R-squared between Bitcoin and other assets in the chart below is low, peaking at only 6.1% with the S&P 500 during the recent price rally. In addition to this, we have not been able to prove the statistical significance of any daily price-change correlation between Bitcoin and any traditional asset using any robust methodology. Scientifically speaking therefore, this article is speculative.

Bitcoin price R-Squared between the S&P 500 index and gold – daily price percentage change over a rolling 180-day period. (Source: BitMEX Research, Bloomberg, Bitstamp)

Recent price movements

Although it’s difficult to make any conclusions based on robust statistical methodology, due in part to the limited number of data points, a chart of the Bitcoin price versus the S&P 500 in the last few months shows a strong positive relationship, which is difficult to totally ignore.

Bitcoin price compared to the S&P 500 index. (Source: BitMEX Research, Bloomberg)

Indeed, as Bloomberg pointed out with the graph below, the peak of the Bitcoin price actually coincided with the peak forward earnings valuation ratio in the S&P 500. This comparison may be somewhat spurious, since the stock market actually peaked at the end of January (while Bitcoin peaked in December) and earnings estimates reset to higher levels for the year ending December 2018 at the end of 2017.

Bitcoin price compared to the S&P 500 index’s forward P/E ratio. (Source: Bloomberg)

Ethereum and Litecoin

We also looked at the rolling Bitcoin daily price-change correlation between Ethereum and Litecoin. The price correlation between these coins and Bitcoin is obviously far higher than for traditional assets and it is statistically significant. During the massive crypto-coin rally in 2017, the price correlation to Bitcoin fell dramatically to the 0.1 level, as altcoins traded against Bitcoin and moved more independently. After the price correction started in 2018, price correlations have began to climb as the coins seem to move together again.

  • Litecoin — The correlation normally tends to be high, at around the 0.5 level. The price correlation dipped to around 0.2 in 2015, when there was not much Litecoin price action.
  • Ethereum — After Ethereum launched, the system was reasonably small and exposed to some unique risks, such as uncertainty surrounding its launch and the model of giving funds to the founding team. Therefore its price correlation with Bitcoin started low before eventually reaching levels similar to Litecoin.

Bitcoin price correlation between Ethereum and Litecoin – daily price percentage change over a rolling 180-day period. (Source: BitMEX Research, Bloomberg, Bitstamp)

Conclusion

Crypto-coin proponents sometimes mention that crypto coins are a “new non-correlated asset class” that can provide a hedge for traditional portfolio managers. These traditional portfolio managers are then expected to allocate a weighting in their portfolios for crypto-coins, which may cause further price appreciation.

It appears that Bitcoin has been a reasonably non-correlated asset class throughout its history. During the recent rally to a valuation of hundreds of billions of dollars, however, correlations — and, crucially, correlations to risk-on assets — started to increase.

Although there is some merit to the hypothesis of crypto-coins not correlating with traditional assets, if crypto-coin prices remain elevated or increase further and become a significant part of the global financial system, higher correlation with traditional assets may become inevitable.

Whether crypto coins are a “new” asset class and whether this matters is another topic. It’s not clear if there is significant merit merely to being new; more importantly, perhaps, is if crypto-coins offer anything unique.