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 0x1e8900843dfbbf453838e7e495001de4abcd8968f8b6dcf75bdcdff09f5bac48. 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/1eba987f-61ab-43ab-be30-4b39453bcdf9.json and https://artists.proofprofile.net/proofs/artist/1eba987f-61ab-43ab-be30-4b39453bcdf9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Baermann: Clarinet Quintet No. 3 in E-Flat Major, Op. 23: I. Allegro non troppo (Version with String Orchestra)
Weber, Mendelssohn, Bärmann : Chamber Music for Clarinet
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 0x44473e044aa9cbd906bd9c29bcab6a4d56e4a123323e2ac459f281d2c8faa8bb. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBAYC0202292.
Adagio for Clarinet and Piano, Op. 23 No. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e01199496e83a6d9e268c1a1bfcb7011361e5b2a804d7beada3b12b308b6a4e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USX9P1353378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x093294f62d8908bb4f3365ad1dec8f1ebe8d66bfa616b1d060428c14eb1b63a3. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T19:45:24Z), 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/DEW912019405.
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 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
Adagio for Clarinet & Strings in D-Flat Major (formerly attrib. Wagner)
Marriner & The Academy - 20th Century Classics
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d090c379e40e0848d4b0515b22b53ae6fcb9ba76e0ab535ab42743384b005bf. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/GBF076811700.
Baermann: Clarinet Quintet No. 3 in E-Flat Major, Op. 23: II. Adagio (Version with String Orchestra, Formerly Attributed to Richard Wagner)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75b816ccdbc1aec39bfbce0a83241784fcf83587c86bb21d4408b9293bd58a13. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/GBAYC0202293.
Baermann: Clarinet Quintet No. 3 in E-Flat Major, Op. 23: III. Allegro (Version with String Orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd969d1517a617ff09377eaae9ed4d4aac4c0306406736df7088556a7c9c91a11. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/GBAYC0202294.