Extra Nonce
Mining● Common
Additional nonce space in the coinbase transaction used when the 32-bit header nonce is exhausted. Changing extra nonce changes the Merkle root, effectively providing unlimited nonce space.
Technical Notes
Header nonce: 2^32 attempts. At 100 TH/s, exhausted in ~40ms. Extra nonce changes coinbase, thus Merkle root, thus block hash. Modern ASICs cycle header nonce, roll extra nonce periodically.
Metadata
Visibility: Public
Created:1/3/2026by System