Mercer Kennedy Ellington (March 11, 1919 – February 8, 1996) was an American musician, composer, and arranger. His father was Duke Ellington, whose band Mercer led for 20 years after his father's deat
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 0x8a5debf389e65dcdab885c1a9ebd2b4798835bba3a13d016469fb2b220ac6d62. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a4b2c375-d5a7-4a5f-9754-f94f0f0c76c7.json and https://artists.proofprofile.net/proofs/artist/a4b2c375-d5a7-4a5f-9754-f94f0f0c76c7.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.