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------X--.---------- BTC Blockchain \ .--------- BCC Blockchain

Let's say that we have some BTC coins from a transaction at block X. And, there are two blockchains now. Is spending these coins at both blockcoins prevented? Are there any BTC/BCC cross check for double spending?

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This is from their FAQ.

Bitcoin Cash transactions use a new flag SIGHASH_FORKID, which is non standard to the legacy blockchain. This prevents Bitcoin Cash transactions from being replayed on the Bitcoin blockchain and vice versa.

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  • I'm not talking about replaying a transaction. What I ask is what would happen if someone creates two different transactions for two different blockchains, using the same private key.
    – yozel
    Commented Aug 2, 2017 at 13:13
  • Then I don't understand your question
    – Pieter Wuille
    Commented Aug 2, 2017 at 14:02

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