Header » transactions_root

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The field transactions_root in header is

ckbhash(T || W)

ckbhash is the hash function, || denotes binary concatenation.

T is the root of a CKB Merkle Tree, which items are the transaction hashes of all the transactions in the block.

W is also the root of a CKB Merkle Tree, but the items are the transaction witness hashes of all the transactions in the block.