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BRC-131: SSM inter-domain addressing note for block broadcast #170

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sirdeggen merged 1 commit into from
Jul 30, 2026
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BRC-131: SSM inter-domain addressing note for block broadcast #170

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7 changes: 7 additions & 0 deletions transactions/0131.md
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Expand Up @@ -168,6 +168,13 @@ The global scope (`FF0E`) ensures block announcements cross site boundaries. The
group index `0xFFFE` is in the reserved control-plane range and is never used as
a shard group for any `shard_bits` ≤ 12.

The address is shown in ASM form (`FF0E::B:FFFE`), which under RFC 8815 is
intra-domain only; inter-domain delivery across site boundaries uses the SSM
address `FF3E::B:FFFE` (see [BRC-129](./0129.md)). The frame format, `HashKey`,
`SeqNum`, and NACK path are unchanged across modes. Under SSM, receivers
`(S,G)`-join using the block-announce source (the emitting proxy, `senderIPv6`);
block-broadcast sources are distributed per BRC-129.

### Sequence Tracking and Retransmission

BRC-131 frames use the same XXH64 hash-chain sequencing as BRC-124:
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