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 0x667c4cb465229c718ec99e3bbd87a2d2f3c3852b3c4484029c771d0ab319bb2d. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7756d332-93cb-4bdc-af3d-07a6382f3905.json and https://artists.proofprofile.net/proofs/artist/7756d332-93cb-4bdc-af3d-07a6382f3905.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sonata in C Minor, TWV 42:C7: I. Adagio (Arr. For recorder, violin and basso continuo)
Telemann / Quantz / Vivaldi / Bach, C.P.E.: Chamber Music for Recorder
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f0d0ec4e5d77e247cf14194fd9d54d33030ced5b93184d9dfc207b5ad7f1e3e. 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/SEAEC9420010.
Sonata in C Minor, TWV 42:C7: II. Allegro (Arr. For recorder, violin and basso continuo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3d6371e04c48b433e5a8d1b526fd292e3e237dd43a020eac14416507cd90e91. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/SEAEC9420020.
Sonata in C Minor, TWV 42:C7: III. Adagio (Arr. For recorder, violin and basso continuo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf75df18ed19afb141530ad80166d1b3c0d91edf440d858abc98babaece2150e5. 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/SEAEC9420030.
Sonata in C Minor, TWV 42:C7: IV. Allegro (Arr. For recorder, violin and basso continuo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x663b460e0ef2f6169b0c8dbac280e30bbbcdd78dbbbc310081767833676b0cda. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/SEAEC9420040.
Trio Sonata in C Major: I. Allegro (con brio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd01ba09720ef9c85aa343df598fac964067cee247209f3f20ffee671a59d57ac. 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/SEAEC9420050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba8cf3cb986d39115e9438b1b344016ee157010be1fcc21ff610c792f7cdf167. 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/SEAEC9420060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb9b9b29cf78c4cbea443d9af8d647152469a9aabec7a30bfe8f49144bb24f0e. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/SEAEC9420070.
Chamber Concerto in G Minor, RV 103: I. Allegro ma cantabile (Arr. For recorder, violin and basso continuo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e28fe95db5aa7f8280ae50a08b202a6c61a7f4432fa48cccee28cf8aa2eb3e2. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/SEAEC9420080.
Trio in F Major, Wq. 163, H. 588: I. Un poco andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7105efe4d67f176ca3a5992c00a3f65880928d6c9f5f1e0ac7bf0f335e9de8b0. 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/SEAEC9420110.
Trio in F Major, Wq. 163, H. 588: II. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5fe509c6a8a1c561736ce6c2f7d06c59970f56778c4d6c090f55debddd9207b. 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/SEAEC9420120.