According to the Celer #cBridge docs, #Celer relies on a network of proof-of-stake (#PoS) validators called “state guardians” to verify that coins are locked on one #chain before being minted on another.

After these multisig #bridges were hacked, developers started turning to more sophisticated protocols like #Celer, #LayerZero and #Wormhole, which claimed to be more secure.