"Decentralized multiagent contracts can be implemented for example by circulating the contract message among the parties and agreeing that the contract becomes valid if every agent signs." ('Contract Types for Satisficing Task Allocation: I Theoretical Results' (1998) by T. W. Sandholm)
Alternatively to passing the contract around, something else to try: an agent noticing that a multiagent contract is necessary could broadcast a proposal of the multiagent contract to all prospective agents and if all agents agree, then the initiating agent could broadcast a confirmation to the recipients sealing the contract.
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