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BRC-132: SSM addressing note for subtree data #171

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sirdeggen merged 1 commit into from
Jul 30, 2026
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BRC-132: SSM addressing note for subtree data #171

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7 changes: 7 additions & 0 deletions transactions/0132.md
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Expand Up @@ -47,6 +47,13 @@ Scope selection follows the `GroupBeacon` pattern defined in BRC-129. Operators
select one or more scopes via the `-announce-scope` flag on listening
components.

Addresses are shown in ASM (`FF0x`) form; under SSM, substitute the `FF3x`
prefix per [BRC-129](./0129.md) (`FF3E::B:FFFB` for inter-domain scope, SSM-only
per RFC 8815). The frame format and NACK/fragmentation paths are unchanged.
Under SSM, receivers `(S,G)`-join using the subtree-data source (the emitting
proxy, `senderIPv6`); the source set is distributed per BRC-129 (data-plane
sources via the shard manifest).

### Frame Header Format (92 bytes)

The BRC-132 header is layout-identical to the BRC-124 header. All infrastructure
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