Abstract: A distributed ledger system includes marine blockchain servers, a method performed by apparatuses, and communication channels between a vessel, its engine, and stakeholders. The system includes an Engine Permission Switch (EPS), a time and location service, electronic fuel (Sec) authorized by the owner, a distributed blockchain contract (Marine Blockchain) connecting a vessel, an engine, coupled to a communication channel, The engine is on only when the EPS provides electronic fuel (Sec). The Marine Blockchain has the entire history of on/off states of the engine. The Marine Blockchain encodes self-executing operating Rules. A Sec counter is decremented by time and by nautical location displacement. Unless replenished by the Marine Blockchain, achieving thresholds cause warnings, requests, and ultimately engine stop.