📅 Original date posted:2018-01-24
📝 Original message:Greetings.
I wanted to ask what was the rationale behind still having both public
key and signature in Segwit witness?
As is known for a while, the public key can be derived from the
signature and a quadrant byte, a trick that is successfully used both
in Bitcoin message signing algorithm and in Ethereum transaction
signatures. The later in particular suggests that this is a perfectly
functional and secure alternative.
Leaving out the public key would have saved 33 bytes per signature,
which is quite a lot.
So, the question is - was there a good reason to do it the old way
(security, performance, privacy, something else?), or was it something
that haven't been thought of/considered at the time?
Артём Литвинович [ARCHIVE] /
npub1g2…mxdp2
2023-06-07 18:10:15
in reply to nevent1q…kerx
Author Public Key
npub1g25gh600s2g8vxzwtgujwcwntz74ld8dnjs8rqvqn7dnk4c3j90smmxdp2Published at
2023-06-07 18:10:15Event JSON
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"pubkey": "42a88be9ef829076184e5a392761d358bd5fb4ed9ca07181809f9b3b5711915f",
"created_at": 1686161415,
"kind": 1,
"tags": [
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[
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"content": "📅 Original date posted:2018-01-24\n📝 Original message:Greetings.\n\nI wanted to ask what was the rationale behind still having both public\nkey and signature in Segwit witness?\n\nAs is known for a while, the public key can be derived from the\nsignature and a quadrant byte, a trick that is successfully used both\nin Bitcoin message signing algorithm and in Ethereum transaction\nsignatures. The later in particular suggests that this is a perfectly\nfunctional and secure alternative.\nLeaving out the public key would have saved 33 bytes per signature,\nwhich is quite a lot.\n\nSo, the question is - was there a good reason to do it the old way\n(security, performance, privacy, something else?), or was it something\nthat haven't been thought of/considered at the time?",
"sig": "5ad193834b32355952b107a79c893d785abc15696ce4be3694d13ae76bd92f6604dc2f6cebd536528320bf9c5f50860462138a4eab1c0560c0d32a419e16ab00"
}