FastBOC: Toward Efficient Covert Communication Merging Blockchain and Onion Networks

FastBOC is a covert communication system (a method for secretly transmitting data) that combines blockchain (a distributed ledger technology) and onion networks (systems that route data through multiple layers to hide user identity). The system uses the blockchain only to send small signal messages while using onion networks for the actual secret data, which reduces costs and prevents permanent exposure of sensitive information on the blockchain.