A2C may refer to: Jingmen A2C Ultra Seaplane Abbreviation for Airman Second Class, a rank in the United States Air Force Advantage Actor Critic, a reinforcement learning algorithm
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8b147164a5d37f679fbcbee7dfa4465938a1054577f2592f4a9926edd5894a7. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/858bfc1b-1ea4-4314-928b-20354d98a179.json and https://artists.proofprofile.net/proofs/artist/858bfc1b-1ea4-4314-928b-20354d98a179.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).