以太坊哈希长度有多长？ （区块、交易、地址）

Question

I checked hash length from node data, like below(include '0x').

• block hash: 66
• transaction hash: 66
• receipt root: 66
• address: 40

Is it always a fixed length? Or is it variable length?

Answer 1

Yes, it's always fixed length.

• Block hash is calculated using the keccak256 algorithm that always results in 32 bytes (64 hex characters prepended by 0x ) no matter the input length.

• Same goes for transaction hash and receipt root hash.

• An address is always the last 20 bytes (40 hex charaters prepended by 0x ) of the public key hash.