André Marques may refer to: André Marques (footballer) (born 1987), Portuguese footballer André Marques (pianist) (born 1975), Brazilian jazz pianist André Marques (actor) (born 1979), Brazilian ac
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 0x03417a83be078f0ab3223cb9f1fdd231e357d3d94670dff3f4ef4863b0d6ba9f. Chain 2 (Bitcoin): anchored in block 954062 (2026-06-17T07:39:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/46e861b9-7e80-4052-b4cb-22ecc4c32976.json and https://artists.proofprofile.net/proofs/artist/46e861b9-7e80-4052-b4cb-22ecc4c32976.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).