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BIP32 amendment: base58chk-encoded extended keys are always 111 chars #1584

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BIP32 amendment: base58chk-encoded extended keys are always 111 chars #1584

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@jonatack jonatack commented Apr 30, 2024 •
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Replaces #727. The description below is copied from that PR.

Base58chk-encoded extended keys are always 111 characters long. Amend wording of BIP32 accordingly.

Diff:
-This results in a Base58-encoded string of up to 112 characters.
+This results in a Base58-encoded string of exactly 111 characters.

Proof:
Version bytes: 0x0488b21e (“xpub”), 0x0488ade4 (“xprv”), 0x043587cf (“tpub”), 0x04358394 (“tprv”)

Largest version byte is 0x0488b21e, smallest 0x04358394.

Largest “possible” key:

kL = 0x0488b21effffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff (78 bytes)
b58chk(kL) = xpubEPi3iGSX9RiyuXPTijevUmMctBDQs2TWCMgUd3qKp6qCgUc8RUsPdPBrRC6whFeWTg37DcmnJJiKFL73DH4sjdApJkXBD3vFcBP4xHq3fPY
len(b58chk(kL)) = 111

Smallest “possible” key:

kS = 0x043583940000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 (78 bytes)
b58chk(kS) = tprv8ZgxMBicQKsPcsbCVeqqF1KVdH7gwDJbxbzpCxDUsoXHdb6SnTPYxdwSAKDC6KKJzv7khnNWRAJQsRA8BBQyiSfYnRt6zuu4vZQGKjeW4YF
len(b58chk(kS)) = 111

@mmgen @jonatack
Base58chk-encoded extended keys are always 111 characters long. Amend…
f1c296b 
… wording of BIP accordingly.

-This results in a Base58-encoded string of up to 112 characters.
+This results in a Base58-encoded string of exactly 111 characters.

Version bytes: 0x0488b21e (“xpub”), 0x0488ade4 (“xprv”), 0x043587cf (“tpub”), 0x04358394 (“tprv”)

Largest “possible” key:
   kL = 0x0488b21effffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff (78 bytes)
   b58chk(kL) = xpubEPi3iGSX9RiyuXPTijevUmMctBDQs2TWCMgUd3qKp6qCgUc8RUsPdPBrRC6whFeWTg37DcmnJJiKFL73DH4sjdApJkXBD3vFcBP4xHq3fPY (111 chars)

Smallest “possible” key:
   kS = 0x043583940000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 (78 bytes)
   b58chk(kS) = tprv8ZgxMBicQKsPcsbCVeqqF1KVdH7gwDJbxbzpCxDUsoXHdb6SnTPYxdwSAKDC6KKJzv7khnNWRAJQsRA8BBQyiSfYnRt6zuu4vZQGKjeW4YF (111 chars)
@jonatack jonatack mentioned this pull request Apr 30, 2024
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jonatack commented Apr 30, 2024 •
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Replaces #727 with cherry-picked 81644dd; note that BIP32 has status Final.

Pinging @sipa for feedback.

@murchandamus murchandamus added the Pending acceptance This BIP modification requires sign-off by the champion of the BIP being modified label May 8, 2024
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@jonatack @sipa @murchandamus @mmgen