📅 Original date posted:2014-03-29
📝 Original message:On Saturday, 29 March 2014, at 9:44 am, Tamas Blummer wrote:
> I used Shamir's Secret Sharing to decompose a seed for a BIP32 master key, that is I think more future relevant than a single key.
> Therefore suggest to adapt the BIP for a length used there typically 16 or 32 bytes and have a magic code to indicate its use as key vs. seed.
I have expanded the BIP so that it additionally applies to BIP32 master seeds of sizes 128, 256, and 512 bits.
https://github.com/whitslack/btctool/blob/bip/bip-xxxx.mediawiki
The most significant change versus the previous version is how the coefficients of the polynomials are constructed. Previously they were SHA-256 digests. Now they are SHA-512 digests, modulo a prime number that is selected depending on the size of the secret.
Matt Whitlock [ARCHIVE] /
npub17q…upwet
2023-06-07 15:16:35
in reply to nevent1q…4j5u
Author Public Key
npub17qxssk9sj2r7jswvh3y32e7vwz7mcckhz33gk9nurdmw0lhsfkgswupwetPublished at
2023-06-07 15:16:35Event JSON
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"id": "0d4cb9290b4f4ad95dadb666cb8392a2ba43f5cbe134c5c942d4a896c4401b5a",
"pubkey": "f00d0858b09287e941ccbc491567cc70bdbc62d714628b167c1b76e7fef04d91",
"created_at": 1686150995,
"kind": 1,
"tags": [
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"content": "📅 Original date posted:2014-03-29\n📝 Original message:On Saturday, 29 March 2014, at 9:44 am, Tamas Blummer wrote:\n\u003e I used Shamir's Secret Sharing to decompose a seed for a BIP32 master key, that is I think more future relevant than a single key.\n\u003e Therefore suggest to adapt the BIP for a length used there typically 16 or 32 bytes and have a magic code to indicate its use as key vs. seed.\n\nI have expanded the BIP so that it additionally applies to BIP32 master seeds of sizes 128, 256, and 512 bits.\n\nhttps://github.com/whitslack/btctool/blob/bip/bip-xxxx.mediawiki\n\nThe most significant change versus the previous version is how the coefficients of the polynomials are constructed. Previously they were SHA-256 digests. Now they are SHA-512 digests, modulo a prime number that is selected depending on the size of the secret.",
"sig": "e923027d454c87b3b3328f3cb7943516974fe8b48f062e96ff29f95b8337889c98a06fa2bb7701b07b34d4afb2cd701ff0fa4a539ea682cf6e7fd64d7ec127e5"
}