Rust based implementation of Transaction Event Log, TEL. TEL is a state machine, where any state change of this statee machine is represented as append only, end-verifiable log that derives its foundations from Event Sourcing and adds cryptographic authenticity on top of that.
TEL proposed here is a issuance revocation state machine, which constists of three states:
* NULL -- given member does not exist yet in the registry;
* issued -- given member declares it is present/issued;
* revoked -- given member declares it is removed/revoked.
EUPL 1.2
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