btc(g3a): populated-block regtest harness + round-trip assertions - #435
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Isolated bitcoind regtest greenlight gate G3a: mine ONE block holding a diverse tx mix (P2PKH, P2SH 1-of-2, native P2WPKH/P2WSH, P2SH-P2WPKH, OP_RETURN) and HARD-FAIL assert that every output-script type and all SegWit witness data survive a full serialize->node->deserialize round-trip: A1 block is populated (coinbase + >=5 payload tx, not coinbase-only) A2 coinbase carries the segwit witness commitment (6a24aa21a9ed) A3 every witness-bearing tx has txid != wtxid (witness not stripped/lost) A4 types-in == types-survived-roundtrip across all core script types Additive scripts/ only; no consensus/shared-base/build.yml/CMake surface. Live evidence (VM420 regtest): block 6d88ddd3..e037eb9c1 height=272 txs=6 witness=4 types=[nulldata,pubkeyhash,scripthash,witness_v0_keyhash,witness_v0_scripthash,witness_v1_taproot] -> PASS
This was referenced Jun 24, 2026
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BTC v36 greenlight gate G3a — mirrors DGB #431. Mine ONE isolated-regtest block holding a diverse tx mix and HARD-FAIL that every output-script type and all SegWit witness data survive a full serialize->node->deserialize round-trip.
Assertions:
Live evidence (VM420 .121 regtest):
Additive scripts/ only; no consensus/shared-base/build.yml/CMake surface. Off-prod, isolated regtest, self-provisions coins.