Unto Uuno Mononen (23 October 1930 in Muolaa – 28 June 1968 in Somero) was a Finnish songwriter and musician. He is best known for his numerous tango compositions including the famous Finnish tango s
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 0xa62c6622229cfc513138268b36c670d86ff874b2070487ecc6dd3651205f0296. Chain 2 (Bitcoin): anchored in block 953846 (2026-06-15T22:48:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/01922bd3-e70f-4d90-96eb-429232fe048c.json and https://artists.proofprofile.net/proofs/artist/01922bd3-e70f-4d90-96eb-429232fe048c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).