TEU may refer to: Tertiary Education Union, an education trade union in New Zealand Treaty on European Union, formal name of the Maastricht Treaty (1992), one of the primary treaties of the EU Twe
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 0x9843e3c5302705a08c24fbd7ea51c9b75116e74019b0c8fb06ea4a282feaa08d. Chain 2 (Bitcoin): anchored in block 953899 (2026-06-16T06:37:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1227a62b-86fc-412d-8c60-9af7bf01f0f2.json and https://artists.proofprofile.net/proofs/artist/1227a62b-86fc-412d-8c60-9af7bf01f0f2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).