createVault(_creator, _id)
defineQuorum(_creator, _id, _minParticipants)
addParticipant(_creator, _id, _participant)
confirmParticipant(_creator, _participant, _id)
promptSignatures(_creator, _id)
signTransaction(_creator, _participant, _id, _tx, _pin)
checkQuorum(_creator, _id, _participant, _txid)
getShards(_creator, _id, _txid)