feat(rpc): tag Zebra-mined blocks with a 🦓 coinbase marker#10836
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Motivation
Closes #10835.
Solution
🦓marker (ZEBRA_COINBASE_MARKER) to the coinbase input of every block Zebra builds, as a single script push. Whenextra_coinbase_datais set, a": "separator and the operator data follow.mining.extra_coinbase_dataa validating newtype (ExtraCoinbaseData) capped at 86 bytes (the 94-byte coinbase budget minus the 4-byte marker, 2-byte separator, and 2-byte push opcode). Oversized values are unrepresentable, so the config fails to load and Zebra refuses to start.A separate marker push would need a
zcash_transparentchange; the single push carries marker + separator + data.Why
🦓, not "Zebra"?The marker is for machines — explorers and hashrate monitors that detect Zebra blocks by scanning coinbase data. Plain ASCII like "Zebra" is something miners genuinely type (pool names, messages, the word itself), so matching it would mis-tag other blocks. The 4-byte emoji (
f0 9f a6 93) is vanishingly unlikely in human text, so a hit is almost certainly a Zebra block — and it's 1 byte smaller than "Zebra", leaving more room in the tight coinbase budget. A leading emoji also reads as a deliberate tag, not incidental text.AI Disclosure