RFC 0003: Block data hash scheme (#10)
Propose a parallelizable two-layer block data hash (SHA-256 over groups of 128 length-prefixed items, then over the group digests) as the new default, and a named BlockDataHashingStructure scheme selected in the genesis block and immutable afterwards. The current flat scheme remains selectable as SHA256_FLAT.
Signed-off-by: Yoav Tock TOCK@il.ibm.com Co-authored-by: Claude Opus 5.5 noreply@anthropic.com
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