thumb|Waldemar Henrique,1949 Waldemar Henrique da Costa Pereira (February 15, 1905 – March 29, 1995) was a Brazilian pianist and composer. Waldemar Henrique was born in Belém do Pará, Brazil, of mixe
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f239327d92409359f259c04ebfe49f53d6b48dc18c2d066e3d4782dc3d3c16. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a2d56595-0bbd-46f2-931f-55be645af1be.json and https://artists.proofprofile.net/proofs/artist/a2d56595-0bbd-46f2-931f-55be645af1be.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).