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For a transaction of type TransactionType.Create, tx, the contract ID is sha256(0x4655454C ++ tx.data.salt ++ root(tx.data.witnesses[bytecodeWitnessIndex].data) ++ root_smt(tx.storageSlots)), where root is the Merkle root of the binary Merkle tree with each leaf being 16KiB of instructions, and root_smt is the Sparse Merkle tree root of the provided key-value pairs. If the bytecode is not a multiple of 16 KiB, the final leaf should be zero-padded rounding up to the nearest multiple of 8 bytes.