Darnell Howard (July 25, 1895 in Chicago – September 2, 1966 in San Francisco) was an American jazz clarinetist and violinist. Early life Howard began playing violin at age seven, picking up clarin
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 0x449a30e407e9b49b83d27b0c7582a3c3dcb414d247153e178735fac3fc4137b9. Chain 2 (Bitcoin): anchored in block 953885 (2026-06-16T04:12:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0bc29cb2-8dae-4d30-8b8c-37e6345511dd.json and https://artists.proofprofile.net/proofs/artist/0bc29cb2-8dae-4d30-8b8c-37e6345511dd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Pioneers of Jazz, Vol. 15 (Mono Version)