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 0x6a609e81f76298d937d9333d6275de34ce81395d0afb285233b8c9cb1d47d6c7. Chain 2 (Bitcoin): anchored in block 954569 (2026-06-20T14:36:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b071c2a2-8cef-42ef-8af2-ab9b02461116.json and https://artists.proofprofile.net/proofs/artist/b071c2a2-8cef-42ef-8af2-ab9b02461116.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 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 0xd021917abc4bfdf346c1788b7ac746e18db6fd87165765c38c54a4de33f4c9cb. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/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 953515 (2026-06-13T12:53:06Z), 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.
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.
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.
4 Impromptus, Op. 90: No. 3 in G-Flat Major, Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70b2020ca92ca42040b3ec56867120a2632b488ba9a1af65d023d246d32fbf45. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/CZA162100890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd2062985fab5d9cd062f63975a6e7edd31501cd097b219b83a6a49f8cb97ed. 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/CZA162100891.
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. 2, Andante tranquillo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29755f09b66092b7dbb816a9a7a67dd8403300eaf6726ee1cf60d1d862fea42b. 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/CZA162100894.
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. 4, Andanino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3e41bb748fe869fcd1ac0f7dc4d782a65a08c3107a10fc232eaf6b84a4480e3. 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/CZA162100896.
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.
Tristan und Isolde, Act 3. Hirtenreigen auf einer Schalmei. Mässig langsam
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcbda2e5e2c348aafe8a13aa94086973f601ef24c6954466e99021b6eff5faab. 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/CZA162100898.
Françaix, Schnyder & Others: Chamber Music
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d2a5362e5ccc53bea37f89e1a6f8bd87ead3e11da245f0b03f80d00bf44432c. 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/DEFG21926541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x771081cb9f1497db7e3a969169ba95e8b93e02946759883f03c39bb9754878e2. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/DEFG21926542.
Contrabassoon Sonata, DWV 133: II. Etwas bewegt
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd326d84d812d8798d9055a65d208b43ebc43cb8cd51ed706d43c413754d2dfc. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/DEFG21926543.
Contrabassoon Sonata, DWV 133: III. Lebhaft
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84c965a1feddbdbd26bb48137907dad8e6bfa0a62359a97f465aecd1d9bfa9ce. 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/DEFG21926544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86b076cad363a69e03af4dcd989ce39cc76e29a8408a82646ae1794f395fd185. 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/DEFG21926545.
2 Stücke, Op. 57: No. 2, Tempo di valse grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f16d7a05a48874d0e306760a321ec38f60661d91f444b1e8194e51b61039f22. 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/DEFG21926546.
6 Stücke, Op. 80: No. 3, Andante tranquillo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0466bd8ff6a7fb60955c3c763c2153fc0da1aceafb3f95d6cd0c7d48a9e4e05. 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/DEFG21926549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7053e1406483db413ec0cadd0aeda9e65a2fc1a0be7570576d6ff91b80077744. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/DEFG21926556.