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 0x69d5e4c6197e038f2057e2fed0be412cf7dea1ca5ea1b8b7a437f57f391f9427. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/52b60265-6c0d-4ed1-ade6-625b02b51fe0.json and https://artists.proofprofile.net/proofs/artist/52b60265-6c0d-4ed1-ade6-625b02b51fe0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Concerto for Cor Anglais, Strings and Basso Continuo in G Major: I. Allegro
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 0xd021917abc4bfdf346c1788b7ac746e18db6fd87165765c38c54a4de33f4c9cb. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CZA162100886.
Concerto for Cor Anglais, Strings and Basso Continuo in G Major: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77ab0ac0b31866eebc786a6566b4a2f9ca423f686a6e9c9753f62004ddc8baff. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/CZA162100887.
Symphony No. 9 in E Minor, Op. 95: No. 1, Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf674a7040ab11e7cfabc6484f42cc81e9519313f6d5f5b5b82aa3369dd95de0f. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/CZA162100889.
Quartet for Cor Anglais, Violin, Viola and Cello: No. 2, Andante tranquillo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29755f09b66092b7dbb816a9a7a67dd8403300eaf6726ee1cf60d1d862fea42b. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CZA162100894.
Quartet for Cor Anglais, Violin, Viola and Cello: No. 4, Andanino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3e41bb748fe869fcd1ac0f7dc4d782a65a08c3107a10fc232eaf6b84a4480e3. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CZA162100896.
Concerto for Cor Anglais, Strings and Basso Continuo in G Major: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f27af8e9b8300a4f0f68cc8f4b02deef1934a13f4f7458df8da0babfd18f752. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/CZA162100888.
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
Quartet for Cor Anglais, Violin, Viola and Cello: No. 1, Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb53d7f039f2ca07b2d703704c7cf1bfacfb9355e9f47c95204bd91901fc0afc6. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/CZA162100893.
Quartet for Cor Anglais, Violin, Viola and Cello: No. 3, Vivo assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1938106b4edd8246907aec911980d988cddcd9c3545dd1e88223b2dab9fba7f. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/CZA162100895.
Quartet for Cor Anglais, Violin, Viola and Cello: No. 5, Allegro giocoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58e774c2382bd90a111274b7ce088b3883442e152b7c857d92553fa76a5c6b69. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/CZA162100897.