BIP-352: clarify silent payment address length #2271

pull notTanveer wants to merge 1 commits into bitcoin:master from notTanveer:fix/sp-addr-len changing 1 files +2 −2

notTanveer commented at 11:05 AM on September 2, 2026: none

the address length note only gave 117 chars as the number to check against, using a 3-char HRP as the example without saying mainnet uses "sp" (2 chars, 116 total).

in bip-0352.mediawiki:210 in 66c0c6dbd9

 206 | @@ -207,7 +207,7 @@ A silent payment address is constructed in the following manner:
 207 |  *** The character "q", to represent a silent payment address of version 0
 208 |  *** The 66-byte concatenation of the receiver's public keys, ''ser<sub>P</sub>(B<sub>scan</sub>) || ser<sub>P</sub>(B<sub>m</sub>)''
 209 |  
 210 | -Note: [https://github.com/bitcoin/bips/blob/master/bip-0173.mediawiki BIP173] imposes a 90 character limit for Bech32 segwit addresses and limits versions to 0 through 16, whereas a silent payment address requires ''at least'' 117 characters<ref name="why_117_chars"> ''' Why do silent payment addresses need at least 117 characters?''' A silent payment address is a bech32m encoding comprised of the following parts:
 211 | +Note: [https://github.com/bitcoin/bips/blob/master/bip-0173.mediawiki BIP173] imposes a 90 character limit for Bech32 segwit addresses and limits versions to 0 through 16, whereas a silent payment address requires ''at least'' 116 characters for mainnet (117 characters for testnets, since the "tsp" HRP is 3 characters)<ref name="why_117_chars"> ''' Why do silent payment addresses need at least 116 (117 for testnets) characters?''' A silent payment address is a bech32m encoding comprised of the following parts:

nymius commented at 12:14 PM on September 2, 2026:

nit: the ref name can be changed too: why_116_chars

notTanveer commented at 7:38 PM on September 2, 2026:

done. thanks.

nymius commented at 12:23 PM on September 2, 2026: contributor

Verified with mainnet test vectors for sp codes.

ACK 66c0c6dbd9183906f07de1607b053edba9bc891c
clarify silent payment address length 2ec04a0fa1
notTanveer force-pushed on Sep 2, 2026
murchandamus added the label Fixups on Sep 4, 2026
murchandamus commented at 5:19 AM on September 4, 2026: member

LGTM, will merge in a few days if I don’t hear otherwise. cc: @theStack

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