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The creators of Bitcoin Gold claim that they have implemented full replay protection. How does this replay protection work?

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I don't believe any replay protection has yet been implemented, they still have an issue open for it on the BitcoinGold repository here: https://github.com/BTCGPU/BTCGPU/issues/51

I haven't dug into the code itself but I would imagine that they would have closed the issue if they had implemented something.

The statement by Bittrex also claims that they haven't implemented any replay protection: https://support.bittrex.com/hc/en-us/articles/115002320451-Statement-on-Bitcoin-Gold-BTG-

Update as of 3rd November 17: A PR for replay protection has been merged, https://github.com/BTCGPU/BTCGPU/pull/109

They announced it via twitter here: https://twitter.com/bitcoingold/status/925600171425259520

It uses a new SIGHASH_FORKID to implement the 2-way replay protection.

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  • It's worth mentioning it is (hashtype | SIGHASH_FORKID (0x40) | 79 << 8 (20,024))
    – MCCCS
    Commented Nov 15, 2017 at 11:09

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