Validate the header of a native EraVM bytecode hash
A native EraVM deployment supplies a versioned bytecode hash. Treating that field as ordinary Keccak bytecode hashing produces a hash with the wrong structure even when the bytes are correct.
Check word count before computing the digest
Decode the native compiler artifact as bytes. Its length must be divisible by 32 and the number of words must be odd and fit the supported length field. The example has three words. Compute SHA-256 of the original bytes and replace its first four bytes with the version, reserved byte and two-byte big-endian word count.
96 bytes / 32 = 3 words
native bytecode hash header: 0x01000003
For three words the prefix is 01000003. A 64-byte artifact has two words and fails the odd-word rule. Inspect compiler output and VM target before attempting to fix a mismatch by padding arbitrary code.
Choose the hash format for the execution mode
The native EraVM hash is used by its deployment machinery. EVM-interpreted code on a chain supporting that mode follows different deployment semantics. A file checksum or Ethereum runtime code hash is a different identifier. docs.zksync.io ZKsync documentation