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 0xd304b593d8331ab3a54a70dc0a61ff819439f83615f18da90b3cd2d62dc49f78. 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/fdb8d8bb-8ba9-460b-ad5e-56654d37e3a8.json and https://artists.proofprofile.net/proofs/artist/fdb8d8bb-8ba9-460b-ad5e-56654d37e3a8.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 0x8334fb42bfc612c9f977ac7f7b89d8cbd87227b77cf1d36e68d7a6455b5a32a1. 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/QZARB1882687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d9a8da6a5c5efdcdfddd410fc16246dd6b3b81b8c991ae97339b915ee038cfd. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZB4J1803444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa943326063cdeee229f6cbaa648a1f70aa2933e87e6d8d54fb0fa1adab4389b5. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FRS182112922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba2c9ad76aea4393b9db847218d8e4c1a6d1e93adea3416c6e4d55b3368e4476. 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/QZARB1876996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94ff7dd03c15d2adc98b1cbdbbd5a4edee9fae7c87f1a7a62b13e56dff467601. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA2P1838104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7560b6e5481df3c8343721ac63522c7c209f896ce0ea9b79fcd9646f42068e31. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/UKN6K1800031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab910e3d72873e7e21e86639160cb50060b17f7314216913f6173e2000c439c7. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/UKN6K1904327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ca7f126cf3dade130ed178c530030dfbe49933e11cc3a7dff5ff1fb619d0453. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZHN72048758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x109ce5e93a4094cdfc069a7910f887415725c5c97f522abc4f8959042267b590. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZMSB2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcca6389c1a82f63c1e6444e74db77310208d9bbc48d5cba389d3dd0c0f6e9d4c. 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/UKN6K2003489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7efa5c07865fce5e2b13ecc85150c276e4f57bd25141cb452503928025974d1b. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/UKN6K2003474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x539f26e7a4f978d5e20cb0f4732ce4ec3ccdf3838c9606e26f35565df4b4bb76. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QM6MZ2270204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf313db2a911ae3223596753dd5b1bbb716d0a059ad8a45b55701e29f53f67af4. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T14:34:52Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKN6K2201414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd61baebdf18b5c4e11465575b16eb0d7ba2c02d147c680c3c987ccaa0b442830. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-16T00:30:23Z), 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/UKACT2232326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a20784a902c7673ec06167b6fb8d15b263d5d9de4c64ab5455feebcc86c0e04. 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/UKN6K2300590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a22595d3c0f53c6b8558cbcb69de63b6a37f04cc91075a8af5d258089659657. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/UKN6K2301654.