Signet Bitcoin holders lock their Signet Bitcoin using the trustless and self-custodial Bitcoin Staking script for a predetermined time (timelock) in exchange for voting power in an underlying PoS protocol. In return, Bitcoin holders earn PoS staking rewards.
Finality providers perform the voting. A Signet Bitcoin staker can create a finality provider and self-delegate or delegate its voting power to a third-party finality provider.
If a finality provider attacks the PoS system, the Signet Bitcoins behind the delegated voting powers are subject to protocol slashing, deterring attacks on the PoS system.