Verifiable Usage Receipts for AI APIs. Cryptographic proof that your token bill is real. Ed25519 + Fulcio signing, RFC 6962 Merkle proofs, Trillian Tessera log, C2SP witness cosigning, Rekor public anchoring, Rust tokenizer verification. No blockchain.
ed25519 merkle-tree c2sp transparency-log sigstore rekor ai-governance ai-billing token-metering verifiable-receipts trillian-tessera witness-cosigning
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Updated
May 21, 2026 - Go