Block Withholding Attack
Security● Common
A pool sabotage attack where a miner submits valid shares but withholds any shares that would qualify as actual blocks. The pool pays for shares but never receives block rewards from the attacker. Difficult to detect since valid shares look normal.
Technical Notes
Variant: submit block to different pool or solo. Detection: statistical analysis of individual miner success rates. Impact: pool earns less than expected for its hashrate. Countermeasures: oblivious shares (pool can't tell if share is block), reputation systems.
Metadata
Visibility: Public
Created:1/3/2026by System