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BIP-352: clarify silent payment address length #2271

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BIP-352: clarify silent payment address length #2271

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4 changes: 2 additions & 2 deletions bip-0352.mediawiki
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Expand Up @@ -207,7 +207,7 @@ A silent payment address is constructed in the following manner:
*** The character "q", to represent a silent payment address of version 0
*** 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>)''

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:
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<ref name="why_116_chars"> ''' Why do silent payment addresses need at least 116 characters?''' A silent payment address is a bech32m encoding comprised of the following parts:


* HRP [2-3 characters]
Expand All @@ -217,7 +217,7 @@ Note: [https://github.com/bitcoin/bips/blob/master/bip-0173.mediawiki BIP173] im
* checksum [6 characters]


For a silent payments v0 address, this results in a 117-character address when using a 3-character HRP. Future versions of silent payment addresses may add to the payload, which is why a 1023-character limit is suggested.</ref> and allows versions up to 31. Additionally, since higher versions may add to the data field, it is recommended implementations use a limit of 1023 characters (see [https://github.com/bitcoin/bips/blob/master/bip-0173.mediawiki#checksum-design BIP173: Checksum design] for more details).
For a silent payments v0 address, this results in a 116-character address when using the 2-character mainnet HRP ("sp"), or a 117-character address when using the 3-character testnet HRP ("tsp"). Future versions of silent payment addresses may add to the payload, which is why a 1023-character limit is suggested.</ref> and allows versions up to 31. Additionally, since higher versions may add to the data field, it is recommended implementations use a limit of 1023 characters (see [https://github.com/bitcoin/bips/blob/master/bip-0173.mediawiki#checksum-design BIP173: Checksum design] for more details).

=== Inputs For Shared Secret Derivation ===

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