Florence () is the capital and most populous city of the Italian region of Tuscany, with 362,353 inhabitants It is also the capital of the eponymous metropolitan province, which counts 989,460 inhabi
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 0xd087cf876a826ed77fbd343ef6fa8bd8df4ede584d53d604535bcb2278ea652a. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/76dfbb7d-c0b1-4586-8595-005ad540fb35.json and https://artists.proofprofile.net/proofs/artist/76dfbb7d-c0b1-4586-8595-005ad540fb35.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).