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 0x7c4ce6343c23033a494bb087390cb7935d2ea3dd8aa57dc09dfde87040454153. 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/2e0b585d-2e08-4562-9fb6-02fab8c00fba.json and https://artists.proofprofile.net/proofs/artist/2e0b585d-2e08-4562-9fb6-02fab8c00fba.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 0x88e713acf100b6eb6812e6743330b9e7acb0be5a6e3255a6a63ec6ae3d3a961a. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZFZ61953901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x019d05edd512e5c81bc642fb092bee632f267a9a55b1570d0921b5334837f684. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZES92041369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc983878a4eb16e632bc44471e21ce22eca37fcd7ae40de68bfa4c5aac62dd9c. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/FR9W12013556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbafb8cf6a1192986e43ce19dfe12d92a7e3f713385050f0f8b3ba42100f1e3ed. 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/QM42K2244964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbafb8cf6a1192986e43ce19dfe12d92a7e3f713385050f0f8b3ba42100f1e3ed. 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/QM42K2244964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x324f386a02c038f5f81f7bb668ba38978fe21c3256179dfcf6cea18ffa990fd3. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FRDKW2208304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ebed9e30a909c9c1a8a4fc19e6061b979d4cc4963a7bd1e6cab1efc7cee4c98. 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/FRDKW2321193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ca8fc03d7f2e536086103786ba4fe16c90b3262b8fe4decc919fd3bbb00cd43. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FRDKW2322488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9278a7109f6dc4be0c5cb6aa601c8cfb03e759fcaffe51adf0a420cb7c2c0ba5. 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/FXR752300583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeca2286a6ebb5e3917bc1afeff0730a33ecc9179c083a63d366778daab4504e9. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/FXR752412859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x937f96de8659a2e0041e67d1a5f62a42de17d0d55377cb4b9cc3a9ae132d22c6. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/FXR752500566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa25bedd32d6393e7f8586c5c12dfb7a5693918955678c9002791303bb2d49a4c. 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/FXR752300556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc029c6d0156a1bd0051fb82e68010b0aa6b192e6d46952d247cb0095ae9dd794. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FRDKW2202023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac75362f407d8168af95d348842fafb9f1587ac0b4576d5de646747a69ee1f2. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/FRDKW2207508.