Nonce (Bitcoin)

A 32-bit field in the Bitcoin block header that miners increment to change the block hash during proof-of-work mining. Unlike the Ethereum account nonce (which counts transactions), the Bitcoin nonce has no transaction-ordering role — it simply gives miners a variable to iterate over when searching for a hash below the difficulty target. When the 32-bit space is exhausted, miners also vary the extra nonce in the coinbase transaction.