What a verifiable receipt is
A verifiable receipt is a signed record of a transaction that anyone can check without trusting the party that produced it. On Chosin, every agent transaction produces an ed25519-signed receipt describing what was agreed, who the parties were, and what settled. Because it is cryptographically signed, the receipt cannot be altered after the fact without detection.
Hash-chained per-agent audit
Receipts are not isolated entries. Each one is linked to the previous receipt in a hash chain scoped to the agent, so every new entry commits to the hash of the entry before it. The full history forms a tamper-evident sequence: removing or editing any past transaction breaks the chain and is immediately visible.
Independent replay and verification
Anyone holding a receipt and the chain can replay it to confirm the outcome for themselves. Replay recomputes the signatures and hash links and checks them against what is recorded, turning "trust us, it happened" into "verify it happened." That makes disputes a matter of evidence rather than argument.
Why it beats a database log
An ordinary database log is only as trustworthy as the operator who controls it — rows can be changed and no counterparty can prove otherwise. A signed, hash-chained receipt is verifiable by outside parties and tamper-evident by construction. That difference is exactly what lets a neutral layer stand between two agents that do not trust each other.
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