Coinfloor logo

Coinfloor is a London-based Bitcoin exchange. Established in early 2013 with the aim of creating the world’s most reputable and trustworthy digital currency exchange. The company is focused on security and is known for being the first exchange to store all bitcoins in 100% multi-signature cold storage and employing procedures to deter money laundering amidst the lack of government regulation.[1]


Main information

  • Country: United Kingdom
  • Headquarter: London
  • Type: Exchange
  • Round: Seed
  • Cost: $0.1 million
  • Date: 8-Sep-2013
  • Investors: Passion Capital, Taavet Hinrikus, Individual Investors


Coinfloor has launched the first exchange-backed peer-to-peer marketplace for bitcoin, “Coinfloor Market”, which connects vetted brokers with investors and consumers looking to buy bitcoins. Buyers are able to send funds directly to a broker using a local UK bank transfer.[2] Coinfloor is also the first exchange to employ a sophisticated algorithmic rounding engine for fee calculation. By allowing direct conversion between bitcoins and the British Pound (Sterling), the exchange aims to reduce the inconvenience of a two-step conversion that people holding Sterling used to have to go through.

The start-up was founded by Mark Lamb, Amadeo Pellicce, and James McCarthy.[3] In October 2013 the company announced raising an undisclosed amount of venture capital funding from Passion Capital and Taavet Hinrikus, co-founder of TransferWise and the first employee at Skype. In December 2013, Obi Nwosu also joined the company as a co-founder.


Coinfloor began opening accounts for European customers on 29 October 2013 and announced it would be open for trading on 5 November 2013. The 5 November opening of trading was delayed due to technical problems, and Coinfloor re-launched on 25 March 2014.

Six weeks from launch Coinfloor became the first ‘Publicly Auditable’ bitcoin Exchange with a blockchain based proof of solvency available monthly to all its users.[4]

A week later Coinfloor announced setting up an over-the-counter market for bitcoin, aimed at investors looking to do large block trades in bitcoin.

On 30 June 2014 Coinfloor began accepting domestic deposits via local bank transfer in an effort to accelerate its local payments services. After three months of operations with Faster Payments, Coinfloor withdrew the option from its offer, after the Isle of Man banks demand that Capital Treasury Services (CTS), the company that linked bitcoin businesses to banks, cuts all ties with the bitcoin industry.[5]

In July 2014 Coinfloor announced the joining of an investor and Coinfloor’s new executive chairman Adam Knight, a former managing director from both Goldman Sachs and Credit Suisse.

In September 2014, after six months of continuous operations, Coinfloor reported reaching over 1130 bitcoin in 24h trading volume and a 30-day trading volume of over 1 million pounds.

In November 2014, Obi Nwosu took over as Managing Director and the company started to focus more on its relationships with the UK’s top bitcoin brokers. In the period between Q1 2015 and Q3 2016, Coinfloor has launched a number of services including Coinfloor Market and Advance Withdrawals. In July 2015, Coinfloor launched broker-based UK bitcoin marketplace. In January 2017, Coinfloor adopted a ‘no-fee’ bitcoin trading policy. [6]


Introduction of Coinfloor from Mark Lamb with Q&A (UK’s No. 1 Bitcoin exchange)

Coinfloor is a tight team of developers and business partners with experience in Bitcoin, security, analytics and financial services. Most of the team is based in London, England.

One of its founders was James McCarthy (aka Nefario) who was previously the founder of Global Bitcoin Stock Exchange, which controversially shut down in October 2012. McCarthy stepped down as CTO of the company in December 2013[7] and Obi Nwosu, previously CTO at QXL, and WeeWorld was appointed as the new CTO. In May 2014 James McCarty left the business entirely.

Obi Nwosu, Coinfloor’s Co-founder and CEO, has over 20 years of experience building ecommerce sites including WeeWorld, an online game where tens of millions of users bought virtual items using a virtual currency.

Mark Lamb, Co-founder is an ex-bitcoin broker, at one point personally handling over 10% of the UK bitcoin market. He has a noticeable presence in the media as well as major finance conferences (Keynote Speaker at Capital Creation 2014, guest presentation at Trade Tech 2014: All you need to know about investing in Bitcoins and Bitcoin conferences.[8]

Adam Knight, Coinfloor’s Chairman, was previously a Managing Director of the team responsible for building and managing the Credit Suisse – Glencore Global Commodities Alliance, a global commodity derivatives trading business. He was a managing director in the fixed-income department of the investment banking division of Credit Suisse and earlier ran the global metals trading business at Goldman Sachs. He has been an angel investor in London since leaving Credit Suisse in 2011 and believes “that Mark Lamb and his team are building a Bitcoin exchange and storage company that will become a leader in the sector”.


Coinfloor is not an FCA-regulated entity but has received formal communication from the regulatory body deeming regulation not necessary at this point in time. Bitcoin is currently not classified by the FCA as money and as such is not representative of monetary value. Coinfloor has been working closely with the HMRC on the classification of bitcoin.

Coinfloor was the first bitcoin exchange to be registered as a Bureau de change with HM Revenue & Customs and is registered at Companies House with registration number 08493818. Date of Incorporation: 18/04/2013

Provable Solvency Reports

Coinfloor has the longest standing track record among bitcoin exchanges in regards to auditing. Since its launch in 2014 [9] the company publishes monthly solvency reports that contain an obfuscated list of client balances.

Coinfloor’s Provable Solvency Report logic:

Coinfloor creates an obfuscated report of all current client balances (the Solvency Report) and then generates a SHA-256 hash of this report.
They then create a bitcoin transaction to themselves, that includes all currently held client bitcoins and include in the output script the OP_RETURN of the SHA-256 hash of the report, proving that at the time of making the solvency report, Coinfloor held all of its clients’ XBT funds. You can verify the amount and details of the transaction in the block chain following instructions provided by the Company with each report. It includes calculating a SHA-1 digest of a message consisting of the timestamp shown at the top of the Solvency Report and your Coinfloor API authentication cookie.

This audit solution is not seen as perfect but Coinfloor received a good response from the community to this step towards greater transparency.


Coinfloor was the first bitcoin exchange to implement 100% multisignature cold storage for storing client bitcoins. When you deposit, withdraw or purchase bitcoins at Coinfloor, your bitcoins are always held on offline devices within underground vaults which are said to maintain the same security standards as the Bank of England.[10]

Coinfloor’s cold storage is decentralised and secured with Multsignature Pay to Script Hash transactions. Each withdrawal from Coinfloor’s cold storage must be signed by multiple designated keyholders within isolated vaults. This policy prevents any unintended withdrawals from happening and insures against loss of client funds.

Coinfloor is providing company-owned bitcoins to fund the Advance Withdrawals service, allowing users to withdraw up to 2 bitcoins without waiting for a cold storage withdrawal.

Coinfloor Advance Withdrawals

In June 2015, in response to users’ complains about waiting for cold storage withdrawals and not being able to access bitcoind outside business hours, Coinfloor introduced Advance Withdrawals as a way for customers to quickly withdraw small amounts of bitcoins from a Coinfloor-owned online fund, without waiting for cold storage withdrawals.

In order to offer quicker withdrawals without compromising on their cold storage policy, Coinfloor is using company-owned bitcoins to fund our Advance Withdrawal service which enables users to withdraw up to 2 bitcoins without waiting for Coinfloor’s twice per day withdrawals from the cold storage held in underground vaults. The 2XBT limit is refreshed every time a cold storage withdrawal is processed and Coinfloor Advance Withdrawals are settled. Withdrawal requests that take you over 2.0000 XBT are queued for processing from the vault in the next batch.

Coinfloor continues to operate a 100% cold storage policy with no client funds held in a hot or warm wallet.

Maker Taker Trading Fees Schedule

Coinfloor uses a maker-taker fee model. This means that fees are charged after trades are matched and a different fee is charged to the “maker” and to the “taker” of liquidity.

Maker fees are paid when you add liquidity to the order book, by placing a limit order below the lowest sell price for a buy and above the highest buy price for a sell. Taker fees are paid when you remove liquidity from the order book, by placing any order that is executed against a limit order already on the order book.

The fees are charged after an order is matched and not for placing an order. This fee model is used in order to incentivise the most liquidity so that any orders made get fulfilled quickly and at the best possible rate.

Trading fees are charged in corresponding fiat currencies and are subtracted from the total fiat amount reserved by the order in the total balance.

Maker fee Taker fee Trailing 30 day trading volume in GBP Trailing 30 day trading volume in EUR Trailing 30 day trading volume in PLN Trailing 30 day trading volume in USD
0.15% 0.38% < 4,500 < 5,800 < 24,000 < 7,000
0.12% 0.36% < 20,000 < 25,000 < 105,000 < 30,000
0.10% 0.34% < 50,000 < 65,000 < 270,000 < 75,000
0.06% 0.32% < 100,000 < 130,000 < 550,000 < 150,000
0.00% 0.30% > = 100,000 > = 130,000 > = 550,000 > = 150,000

In order to ensure fairness, Coinfloor uses an approach called “weighted stochastic rounding” to calculate the fees charged to its users when trading. Weighted stochastic rounding over time minimises the effects of rounding errors. To understand why this rounding method is preferable to traditional “round-to-nearest” rounding methods, consider the case of one hundred occurrences of a 4.71 fee, each rounded according to the nearest whole number. Using the weighted stochastic rounding method, the expected value of the sum of these rounded figures is 471, which is exactly equal to the ideal sum of the unrounded figures. Using the traditional method, the expected value of the sum of the rounded figures would be 500, which is far from ideal as it results in a much higher fee charged.


The London-based operator of cryptocurrency exchanges, Coinfloor has said that the new exchange is under his control CoinfloorEX next month will launch futures contracts for bitcoin. “When you communicate with those who provide liquidity in the market, they all ask for one thing — give us futures contracts for bitcoin, but with physical calculations so that we can hedge risks on various trading platforms,” Coinfloor founder Mike lamb said.

CoinfloorEX exchange is mainly focused on hedge funds and private trading companies, as well as representatives of the mining industry. It was traders and large investors who began to criticize the settlement (non-delivery) futures contracts for bitcoin. They are convinced that the underlying asset in this case may be subject to manipulation by unscrupulous market players. The launch of futures on CoinfloorEX is scheduled for April.

External links

See Also on BitcoinWiki


  1. Wired London-based Bitcoin exchange Coinfloor opens for business
  2. Coinfloor Launches Broker-Based UK Bitcoin Marketplace
  3. Coindesk UK bitcoin exchange Coinfloor opens for business
  4. London’s New Bitcoin Exchange Hopes to Avoid Mt. Gox Fate
  5. Banks Cut Ties With Isle of Man’s Bitcoin Industry
  6. UK Exchange Coinfloor Embraces ‘No-Fee’ Bitcoin Trading – CoinDesk
  7. 2014 is going to be a big one – Launch Updates
  8. CoinSummit London 2014 – The Challenges of Operating a Bitcoin Business in Europe
  9. Coinfloor’s Quest to Invent Post-Gox Exchange Security
  10. Bitcoin security – We are paranoid about security