--- Log opened Mon Oct 05 00:00:38 2020
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03:18 < michaelfolkson> I'm looking at creating a P2TR address which just needs a key path spend, not a script path spend.
03:18 < michaelfolkson> https://bitcoin.stackexchange.com/questions/99325/i-want-to-create-a-p2tr-pay-to-taproot-address-but-i-just-need-a-key-path-spen
03:19 < michaelfolkson> The BIP says you can calculate the tweaked public key using Q = P + int(H(bytes(P)))G
03:20 < michaelfolkson> Is that literally the hash of the number of bytes of the public key? int(H(bytes))
03:21 < belcher> id guess that means the bytes of P, fed into a hash function, then interpreted as an integer
03:22 < belcher> as the hash of the number of bytes would always be the same, it would be H(32)
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03:24 < michaelfolkson> P + H(32)*G
03:25 < michaelfolkson> Ok thanks
03:26 < michaelfolkson> If this is wrong (anybody else) please let me know and I'll update the SE post
03:26 < michaelfolkson> But thanks belcher
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04:28 < nickler> michaelfolkson: you've misunderstood belcher, he said it can't be H(32)
04:29 < michaelfolkson> Oh right gotcha :) I thought that seemed wrong
04:29 < nickler> bip-341 reuses some definitions of bip-340 including bytes(): P is an EC point, bytes(P) is the serialization of P
04:29 < nickler> with H(32) I think the attack described in footnote 22 would still work
04:30 < michaelfolkson> Sorry belcher, read it wrong
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05:55 < nickler> SE answer looks correct now
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--- Log closed Tue Oct 06 00:00:38 2020