These Bitcoin companies already announced their position regarding a potential fork. If you didn’t yet, please let your users know where you stand.


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A joint statement by 20 exchanges

Including: Bitfinex, Bitstamp, BTCC, Kraken, BTC China, Poloniex, itBit, ShapeShift, bitt and others.

…we have decided to designate the Bitcoin Unlimited fork as BTU (or XBU). The Bitcoin Core implementation will continue to trade as BTC

However, none of the undersigned can list BTU unless we can run both chains independently without incident. Consequently, we insist that the Bitcoin Unlimited community (or any other consensus breaking implementation) build in strong two-way replay protection.


We are 100{88c91daedd271a990a10650c05d769cae2765e0603edf30ca95f18704e5748e8} supportive of the safe, tested SegWit functionality available for activation in core code today and believe it is by far the safest way to gain additional block space in the near term.

Bitcoin Unlimited does not meet the above tests for being a supportable fork today. In fact, it fails all three criteria. Additionally, there are serious problems with “emergent consensus”…

As such, we will not be able to provide support for a hard fork caused by Bitcoin Unlimited in its current form.


We cannot responsibly support Bitcoin Unlimited on the Bitrated platform as an altcoin due its lack of hardfork-related safety measures, its inherent re-org instability and its potentially prohibitive operational costs.

Bitrated is technically, financially and logistically unable to safely and reasonably support networks with unbounded block size or with the “emergent consensus” mechanism

In the case of the mainline Bitcoin client adopting an unbounded block size proposal, we will be forced to shut our full-nodes off and cease offering services for the BTC currency.

Canadian Bitcoin Economic Nodes

We support the activation of Segregated Witness as an immediate solution to Bitcoin scaling and as a fundamental component of a long-term capacity increases roadmap.

Any contentious hard fork of the Bitcoin blockchain shall be considered an alternative cryptocurrency (altcoin), regardless of the relative hashing power on the forked chain.

In addition, we believe Emergent Consensus fundamentally alters the nature of Bitcoin by increasing the responsibilities and powers of the Bitcoin miners, disrupting the existing checks and balances system.


…we support SegWit, both as an immediate yet cautious increase in block size, and as a first step for solutions like Lightning, which we are already building on.

We clearly recommend that issuers choose Bitcoin Core, as we believe it’s the safest option. For this reason, all hosted infrastructure supplied by us will continue to use Bitcoin Core. We also won’t be able to provide support for other forks.


I, Thomas Voegtlin, support Segregated Witness as a scaling solution for Bitcoin, and I am opposed to a hard fork initiated by miners running Bitcoin Unlimited.


As many of you might have noticed on Twitter, Bitsquare is in clear opposition to BU and I personally consider it not only as a reckless and irresponsible behavior […] but as a political attack on Bitcoin.

In the rather unlikely event that they really start a hard fork and the even more unlikely event that they would succeed to take over the Bitcoin network and destroy the current version I would either move the main currency to what will be the follower project of the current Bitcoin Core development branch or move to another Altcoin like Monero.

This personal position might explain why I react rather emotional and radical in regards to BU. I experience it not only as a threat for Bitcoin but as a threat to the work I was spending my time the last 3 years.”


We will support Bitcoin Core continuously as BTC.

Poloniex agrees that any contentious hard fork must include replay attack protection


The Armory developers (goatpig, droark, and achow101) support Segregated Witness as is in its current form, and also support Bitcoin Core. The Armory developers also oppose hard forks that may attack the original chain.

Bitonic / Bl3p

We will not consider contentious hard forks (without industry-wide consensus) as Bitcoin. Instead we will consider it an alternative cryptocurrency which we will not, out of principle, support.

… we are not financially and technically capable of supporting Bitcoin Unlimited based on the "Emergent Consensus" principle, not for ourselves and not for our customers.

BL3P will, in any case, continue to support the blockchain that is based on the Bitcoin Core software. The bitcoins on this chain will be listed as 'BTC'.


GreenAddress does not support contentious hard forks that risk disenfranchising users, irrespective of hashing power. We believe that such an outcome would create an irreparable precedent that would severely undermine social trust in Bitcoin and potentially set it back for years to come.

Blockchainlab Milan

Indispensable prerequisites for a hard fork to be not contentious are:

  1. Clear activation and on-chain coordination processes.
  2. Long grace period which reflects a pessimistic and conservative assessment of node upgrade capacity.
  3. Strong 2-way replay protection which does not place excessive burden on the users.
  4. Wipe-out protection, meaning that the hard fork must be permanent.
  5. Must be entirely open-source at all times of the development and implementation process.
  6. Must be peer-reviewed and tested extensively over a sustained period of time.

Currently Bitcoin Unlimited is not in compliance with any of points outlined. supports a single version of Bitcoin, which is Bitcoin Core (BTC)

we consider any hard fork which is rolled out without industry-wide consensus, and therefore splits the network, to be an altcoin, not Bitcoin itself. This is irrespective of how much hash power the forked coin may have. Ours is only one voice of many, but this is entirely consistent with the view currently taken by the economic majority of Bitcoin exchanges.


In the case of a fork, we support the plan as proposed by Bitfinex, Bitstamp, BTCC et al. It will not be possible for any exchange, including BitMEX, to support both chains separately. For these reasons, BU will not be listed or used as a deposit/withdrawal currency until replay protection is implemented and BU is not at risk of a blockchain reorganization if the Core chain becomes longer.

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1 BTC = $20217.03 USD  (via Coinbase)
1 ETH = $1353.54 USD  (via Coinbase)
1 LTC = $54.66 USD  (via Coinbase)
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