Albi (; )However, after the preposition a ~ à, the name becomes as Albi ~ à-z-Albi is a commune in southern France. It is the prefecture of the Tarn department, on the river Tarn, 85 km northeast of
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 0xbbf063d0293ec340df7fdbe314615cc544cfdbc71121e2a8553a5f19d086ad53. Chain 2 (Bitcoin): anchored in block 954638 (2026-06-21T03:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d36cc87d-30a0-4d98-99cc-89a306e900f7.json and https://artists.proofprofile.net/proofs/artist/d36cc87d-30a0-4d98-99cc-89a306e900f7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).