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 0x987d169a1b1025d2c4cce8c3be5d46209460b85c7fa6bc9263e009576160ce3a. 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/6944fc28-3612-41a7-aa2e-aee1dc96ca67.json and https://artists.proofprofile.net/proofs/artist/6944fc28-3612-41a7-aa2e-aee1dc96ca67.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 0x93fe525cbc7d9bada75bd08740479991b48d3520d84ffda68988acc2f4d836ee. 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/TCAJA2455056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf89523388999b4d887e80f760ecebea9fc3a9f6cfc94dad93c05e5582f18c0b2. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAJA2454968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cbbb47b80985b79c99954a812c245759de6c8854b03c1cecbc13cc09544e882. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAJB2454979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfab2bcd2d6de5a85177b3ddd6012ef1fcc106a003682dc64005f00d5630eeff. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/TCAJB2419324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1ac74a076a6d41ffce6463c2054a02abe2b82fbe7bb8863bb082434c4c6eb19. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/TCAJB2419325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0051c3e86d7cd8836f91cceed14b47bcc108f0452bd1ceafd561e194f193dea3. 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/TCAJB2419327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4542e119d98b53e0158ce995f2551910c07a541a9dfc286c842c654ad32abe47. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/TCAJB2419334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82af3be3d8077b27bc14e10409f32332bc6e83434da4f94cea946e85e4478b09. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/TCAJB2419338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff223717b1eb44e396e64f81b871954550c8e54c5b28fe62734a5d435b9df41a. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/TCAJB2419343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f23b65853528d79f8b045d9f766122e955952080cc665f45c4077796e318d78. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/TCAJB2419346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9cdc9def0f38347443b0242cd10ee53732b742a4e4d11847813bbdd0c9b5d3a. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCAJB2419349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca02b89be4b0cedeede6d6e30d666c482de402d1f7cdc095aa057d27ad35d206. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/TCAJB2419353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x921eb29b6e509ef946e4b640daa5e0a6804ffdb727dbd3cc96f4092c5f668f0d. 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/TCAJB2419360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe02f26905984a6334f279bf5694d78f193c4619921fbacf55b88064daf518cd. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/TCAJG2513065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3ccb41fe6637848572e8343f5b42c17a40827a3d7d7d041dc06fd6e552b4223. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/TCAJG2513123.