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title: "Beware of Bitcoin's incompatibility with Coinbase & others"
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title: "Beware of Bitcoin's possible incompatibility with some major services"
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shorturl: "segwit2x-safety"
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active: true
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banner: "Beware of Bitcoin's incompatibility with Coinbase & others"
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banner: "Beware of Bitcoin's possible incompatibility with some major services"
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bannerclass: "alert"
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date: 2017-10-09
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date: 2017-10-11
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---
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## Summary
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A subsection of the Bitcoin economy including Coinbase have signed an agreement to adopt
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A subsection of the Bitcoin economy including prominent businesses such as Coinbase, Xapo, and BitPay have signed an agreement to adopt
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and implement a contentious hard fork of Bitcoin [sometime](http://bashco.github.io/2x_Countdown/) in November. A hard fork is a
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backwards incompatible change to the Bitcoin network. This hard fork is not supported by
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the majority of the Bitcoin users and developers and is therefore a contentious hard fork.
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By adopting this hard fork, we believe the supporters of this agreement of which the most
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prominent are Coinbase, Bitpay and Xapo are effectively exiting the Bitcoin system and are
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shifting their users to an alternative currency (an altcoin) which is incompatible with Bitcoin.
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By adopting this hard fork, we believe the supporters of this agreement are shifting their users to an alternative currency (an altcoin) which is incompatible with Bitcoin.
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The signatories of this agreement wrongly believe that the currency created by adopting
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this contentious hard fork will become Bitcoin. Therefore storing any BTC on services such
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this contentious hard fork will eventually become Bitcoin. Therefore storing any BTC on services such
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as Coinbase, Bitpay and Xapo is strongly not recommended. By storing BTC on these services, you could
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find that after the hard fork, your BTC has been replaced with something other than Bitcoin.
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find that after the hard fork, your BTC has been renamed to something else or replaced entirely with the new altcoin.
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The best way to ensure that your BTC is protected is to [download the latest version of Bitcoin Core](https://bitcoin.org/en/download)
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and transfer out any BTC stored on services that are a signatory to this agreement. We have
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listed the businesses supporting this contentious hard fork at the bottom of this document.
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## SPV Wallets
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For users who aren't prepared to install Bitcoin Core and go through the lengthy set up process, we recommend
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a wallet such as [GreenAddress](https://greenaddress.it/) or [Electrum](https://electrum.org/). Avoid using web wallets like blockchain.info.
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However users should only use these wallets to store their coins and never perform transactions until well after the hard fork. Any transactions you
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make on the Bitcoin blockchain can also be replicated and "replayed" on the altcoin chain. If the coins on the contentious
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hard fork have any value, there will be methods you can use to "split" your coins and have access to them. Pay extra attention
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to major Bitcoin communication channels and media shortly after the fork so you stay informed.
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There is considerable mining power supporting the contentious hard fork. Miners in Bitcoin
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are responsible for transaction ordering through putting transactions into blocks, and collectively
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creating a chain of these blocks. A supermajority of miners have pledged to support the contentious
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hard fork, therefore the longest chain as seen by an SPV wallet such as Electrum and Breadwallet (which perform
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no validation of the content of these blocks) may not be the true block chain. As a result of this, storing and
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using an SPV wallet during a hard fork is not recommended. You will be vulnerable to many attacks as your
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wallet is not aware that the miners are breaking the consensus rules.
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## Mobile wallets
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If you are a user of an SPV wallet, the best way to safely spend your Bitcoin after the hard fork
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is to transfer them to a [Bitcoin Core](https://bitcoin.org/en/download) wallet and then spend from
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there. If the contentious hard fork has failed and the supermajority of miners have broken their pledge
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to support the hard fork, it is safe to continue using SPV wallets, however you should check multiple
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Miners in Bitcoin are responsible for transaction ordering through putting transactions into blocks, and collectively
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creating a chain of these blocks. Most mobile wallets depend on blindly trusting the longest chain produced by the miners in order to safely send and receive transactions.
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There is considerable mining power supporting the contentious hard fork. A supermajority of miners have pledged to support the contentious
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hard fork, therefore the longest chain as seen by most mobile wallets may not be the true block chain. As a
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result of this, spending money from a mobile wallet during a hard fork is dangerous. You will be
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vulnerable to many attacks as your wallet is not aware that the miners are breaking the consensus rules on the longest chain.
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If the contentious hard fork has failed and the supermajority of miners have broken their pledge
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to support the hard fork, it is safe to continue using mobile wallets, however you should check multiple
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sources of Bitcoin news such as this website, [/r/bitcoin](https://www.reddit.com/r/Bitcoin/), and the [Bitcoin Forum](https://bitcointalk.org)
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to make sure that it's safe to continue using your particular wallet. As a general rule, we recommend that you
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avoid making transactions **during** the hard fork, but if you really need to transact, you must use Bitcoin Core.
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to make sure that it's safe to continue using your particular wallet. As a general rule, you should not perform any transactions
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during and shortly after the hard fork.
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## After the fork
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@ -49,7 +51,7 @@ Blocks may be slower shortly after the hard fork and your transactions will take
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will have to pay a higher transaction fee if your transaction is high priority and you want it confirmed
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in the next block. You should try to get any important transactions done a few days before the hard fork [date](http://bashco.github.io/2x_Countdown/).
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A lot of websites and programs will likely pop up around the time of the hard fork offering to split your Bitcoin
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so you can have access to both your BTC and to the new currency created by this contentious hard fork, you should
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so you can have access to both your BTC and to the new altcoin created by this contentious hard fork, you should
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exercise caution as many of these services are likely to be scams trying to steal your bitcoin. As the
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hard fork has very little replay protection, most transactions you perform on the Bitcoin network will also
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be valid on the hard fork network. You should keep this in mind when transacting.
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@ -65,57 +67,68 @@ As this new altcoin is not Bitcoin, Bitcoin.org will not list wallets and servic
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this altcoin as "Bitcoin" or "BTC" to their users after the hard fork. These services have exited
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the Bitcoin system in a contentious manner and therefore are no longer useful to our visitors.
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## New York Agreement signatories
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The following companies and services have pledged to adopt the contentious hard fork:
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The following companies and services have pledged to adopt the contentious hard fork.
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## Wallets
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+ 1Hash (China)
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+ Abra (United States)
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+ ANX (Hong Kong)
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+ Bitangel.com /Chandler Guo (China)
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+ BitClub Network (Hong Kong)
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+ Bitcoin.com (St. Kitts & Nevis)
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+ Bitex (Argentina)
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+ bitFlyer (Japan)
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+ Bitfury (United States)
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+ Bitmain (China)
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+ BitPay (United States)
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+ **BitPay (United States)**
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+ BitPesa (Kenya)
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+ BitOasis (United Arab Emirates)
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+ Bitso (Mexico)
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+ Bixin.com (China)
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+ Blockchain (UK)
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+ Bloq (United States)
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+ BTC.com (China)
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+ BTCC (China)
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+ BTC.TOP (China)
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+ BTER.com (China)
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+ **Blockchain.info (UK)**
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+ **BTC.com (China)**
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+ Circle (United States)
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+ Civic (United States)
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+ Coinbase (United States)
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+ **Coinbase (United States)**
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+ Coins.ph (Phillipines)
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+ GoCoin (Isle of Man)
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+ Jaxx (Canada)
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+ Luno (Singapore)
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+ Ripio (Argentina)
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+ Unocoin (India)
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+ **Xapo (United States)**
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## Exchanges
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+ ANX (Hong Kong)
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+ Bitex (Argentina)
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+ bitFlyer (Japan)
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+ Bitso (Mexico)
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+ BTCC (China)
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+ BTER.com (China)
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+ **Coinbase (United States)**
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+ Coins.ph (Phillipines)
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+ CryptoFacilities (UK)
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+ Korbit (South Korea)
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+ Safello (Sweden)
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+ SFOX (United States)
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+ **ShapeShift (Switzerland)**
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+ SurBTC (Chile)
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## Miners
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+ 1Hash (China)
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+ Bitcoin.com (St. Kitts & Nevis)
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+ Bitfury (United States)
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+ Bitmain (China)
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+ Bixin.com (China)
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+ Genesis Mining (Hong Kong)
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+ ViaBTC (China)
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## Other
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+ Bitangel.com /Chandler Guo (China)
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+ BitClub Network (Hong Kong)
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+ Bloq (United States)
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+ Civic (United States)
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+ Decentral (Canada)
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+ Digital Currency Group (United States)
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+ Filament (United States)
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+ Genesis Global Trading (United States)
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+ Genesis Mining (Hong Kong)
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+ GoCoin (Isle of Man)
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+ Grayscale Investments (United States)
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+ Jaxx (Canada)
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+ Korbit (South Korea)
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+ Luno (Singapore)
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+ MONI (Finland)
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+ Netki (United States)
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+ OB1 (United States)
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+ Netki (United States)
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+ Purse (United States)
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+ Ripio (Argentina)
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+ Safello (Sweden)
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+ SFOX (United States)
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+ ShapeShift (Switzerland)
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+ SurBTC (Chile)
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+ Unocoin (India)
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+ Veem (United States)
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+ ViaBTC (China)
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+ Xapo (United States)
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+ Yours (United States)
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