test(dash-s8): mining.submit reassembly KAT — close subscribe->notify->submit triangle#635
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test(dash-s8): mining.submit reassembly KAT — close subscribe->notify->submit triangle#635frstrtr wants to merge 1 commit into
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…->submit triangle Pin the miner->pool submit half of the S8 stratum-binding suite: given a submit (extranonce2, ntime, nonce), reconstruct the exact 80-byte block header whose sha256d is the share identity, and prove the reassembled coinbase matches the split/notify leaf goldens byte-for-byte. Binds landed producers split_coinb + merkle_branches_raw; header field order/endianness mirror the landed submit verifier share_check.hpp:306-321. Coinbase-hash goldens are byte-identical to #631/#632/#633 and ROOT for extranonce2==0 equals the notify-roundtrip canonical root (non-circular, independent Python hashlib). Pure/socket-free/node-free; fenced to test/.
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S8 stratum-binding suite, submit leaf. Closes the subscribe -> notify -> submit triangle: given a miner submit (extranonce2, ntime, nonce), the pool reconstructs the exact 80-byte block header whose sha256d is the share identity, and the coinbase reassembled under that extranonce2 matches the split/notify goldens byte-for-byte.
Landed producers bound (not reimplemented):
split_coinb+merkle_branches_raw(coinbase_builder.hpp). Header field order/endianness mirror the landed submit verifiershare_check.hpp:306-321(uint256 raw bytes + uint32 LE = canonical 80B header).Non-circular anchors: independent Python hashlib sha256d. Coinbase-hash goldens are byte-identical to #631/#632/#633; ROOT for extranonce2==0 equals the notify-roundtrip canonical root.
Fencing: test/ + test/CMakeLists.txt only. Pure / socket-free / node-free — synthetic coinbase + synthetic sibling tx hashes, no dashd, no live sharechain. Non-consensus, additive.
Base master ff20c36. 8 KATs: header geometry/field placement, coinbase cross-bind, merkle-root cross-bind, prevhash fixture, full header+share-hash golden, nonce/ntime iteration, extranonce2 propagation.
Merge-gated: no self-merge — surfacing for review + operator tap on green rollup.