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 0x2f8834cf4e676f077f7c35dff6a03b75d41c3e8ac49639f35c7e18c58f4782cf. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b5e38855-cde8-4b61-bdf2-9e8a56a2baac.json and https://artists.proofprofile.net/proofs/artist/b5e38855-cde8-4b61-bdf2-9e8a56a2baac.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Il violino Boemo. Music from 18th Century Prague
Jiránek: Concertos. Music from 18th Century Prague
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 0xda37a3faf9cd034f9776e09b9ac3793881aa11261fd180b29a94e39304ede6bf. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161602349 — a six-check JSON result.
Quartet for Violin, Cello, Bassoon and Basso continuo in G Minor: I. Adagio
Musici da camera. Music from 18th Century Prague
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c5ca6549a9e1f0a3f16e71f930ddc7db9795fe32c804e38f1d11be9254bfc60. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161204584 — a six-check JSON result.
Quartet for Violin, Cello, Bassoon and Basso continuo in G Minor: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2456ef6ecadece5f3514eb4bf41bcde92010b20d80fb104d98cb44f4a6ee3d6e. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161204585 — a six-check JSON result.
Quartet for Violin, Cello, Bassoon and Basso continuo in G Minor: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee1e42a8f693f3af6e97a5635b1777a1e2d8562f2e6a2ea59f0d566c70b2456e. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161204586 — a six-check JSON result.
Quartet for Violin, Cello, Bassoon and Basso continuo in G Minor: IV. Tempo di menuet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8ae1087f4b1bd6fb26f5e307fbe165b59d1eff855fe5a121daea161dcafe7f7. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161204587 — a six-check JSON result.
Quartet for Flute, Violin, Bassoon and Basso continuo in D Major: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5314b3973417ef4c118cb0ca2c9e3c0d4472d2758dbcac0784531da40bfbbcc7. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161204597 — a six-check JSON result.