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BRC-135: correct emitter HashKey group index to 0xFFFA; SSM egress note - #174

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jefflightweb:brc-135-fixes
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BRC-135: correct emitter HashKey group index to 0xFFFA; SSM egress note#174
jefflightweb wants to merge 1 commit into
bsv-blockchain:masterfrom
jefflightweb:brc-135-fixes

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This pull request:

Amends or corrects an existing standard, without the need for creating a new one

Summary

Two items.

  • Corrects the emitter HashKey ingredient from 0x0000FFFE (GroupBlockBroadcast) to 0x0000FFFA (GroupBlockHeader) — the egress channel the frame is actually sent on, matching the rest of the spec (the Multicast Group section) and the reference implementation.
  • Adds an SSM note: the egress address takes the FF3x form under SSM, the source is the emitter (emitterIPv6), and the multi-emitter reliability pattern must use distinct per-emitter sources or VRRP active-standby — anycast/shared-source emission is not supported under SSM (per BRC-129).

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