James Sommerville is a Canadian orchestral hornist and conductor. He was the principal hornist for the Boston Symphony Orchestra, and former Conductor and Music Director of the Hamilton Philharmonic,
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 0x43c9fc2ab7f483e0c59f57ccb0f765df9e7a49ce0165c409e469a8d2f89ef7a4. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1b094d61-672f-41bb-8642-4e9f7bd0745f.json and https://artists.proofprofile.net/proofs/artist/1b094d61-672f-41bb-8642-4e9f7bd0745f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
6 Bagatelles for Wind Quintet (1953, Arr. from Musica ricercata): I. Allegro con spirito
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fbc7c0e689b6db8cea89ec2bc2e770526094f9754235a90bc035a7605ad2e90. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF059603471.
6 Bagatelles for Wind Quintet (1953, Arr. from Musica ricercata): III. Allegro grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5facac0b720997dff368845359ffeb42f85afc047b8c95da25f4b58a14d07e71. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF059603473.