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 0xc2402426f4d8fa70689deb943e012654854eac07f605d33855824fb69d95df00. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e43ef25d-1d4c-42d7-bd21-2feccdcc1e20.json and https://artists.proofprofile.net/proofs/artist/e43ef25d-1d4c-42d7-bd21-2feccdcc1e20.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x0fe4b2c8d10ab402706e0ea2344122c061a76825dac25d6e625a42e4d9079bd5. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/FR2X41982363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78c66c65a5d37326ca66026c73667a2de17af2966c6218209bd596c35cd7a59d. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/FR96X1991367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ec9dae568dbe57200ba16516aa0683c20d7c30f28246b6188d0205ccec6cb7e. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/FR96X1991368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa5607bee8b37921e0b181bdd2c37aaa1d7b8b96664e8c24073df8c6524a8855. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/FR96X1991369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x130cbf55ec51ed33ecb9bb23d221a1c2d69ed348c532b944eb302c20bdbfab36. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/FRX202062477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b07d89014df9a97c93e0eea9be9ac99d6cd4f28b98c3b1b75b7d4d35ca44a9f. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/FRS182078001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fed889f719aae62fa294962ca6866b7116713cfacd35c7e8a9d979bcc412611. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/FRS182113214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffae970ef4cb1dc5eabc76ba85e8064b7dfbd3da8f7e51e9d20c22d0c2aa357f. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/FR10S2468704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4e4fb0c26caa43fc5d7a6c76771102266aa5078f07b240b18912d703cbf3660. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DGA052406754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb430c2c9f2ba7a851c11fc34ffd56a170f10398064277ba4b1c67007fc450d8e. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/DGA0T2400318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cbdd7e580da08b892a082172f7cb191c7269722198cfacc1f3352cdeeebfcd2. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR10S2580841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c7fcb325fdebb1ef8af7780f278af85a67c2714d1ab1a191845134827b26f7f. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FR2X42518279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31c2f2603a9249e6bd44baecf0cf08d330901dda69079adb81ce2778f06f307e. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/FR59R2539813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e19d3f7e7a419f861e6b91a40e985033fc2ed1616ac13480c58caca55d4aa0b. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/RUB422501745.