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 0x17fc84bf763aed3b70a8bbe7cdd5bf5b3325bf01edbe490f5c299669f0ef0b6e. 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/120b1968-16ab-48d3-a2a5-b45b65a75d83.json and https://artists.proofprofile.net/proofs/artist/120b1968-16ab-48d3-a2a5-b45b65a75d83.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 0xe3b228662521de26be98ee5e3cf63b99264db416387faf687e82e8338b4f8637. 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/PLA551900119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe21b7661d8438f66f61d15bf9eb27b1218f258ff5e9bae300cd17615d56f3b50. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLUM72200177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9986814d345ae6f9dbe0cf059ebfb1a49eaac56389e8fa3056c21b9480756386. 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/PLUM72400158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d4374ebb56306dd1aa2f0fd813d20c9f1857fa801ced71e275335833f40d820. 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/PLA552000471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86fecc94b12826cde5188388603d00a747495f5b8307d7abec5cef185141f9b0. 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/PLD112100016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb6af207feeab051c7d20f4f3cc31ef8e190e594d607bf49e7f169ab270c670b. 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/PLD112100017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78d10e69fd04695e16dd09d5f837333bd9f0ce2c0308cd6d234b31d77e2c7ff7. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/PLD112100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb94a6b38972b81e10818d5716aab69a1b0bd084d93f0e8d28614633d1409985e. 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/PLD112100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c82d35524a334b5a4cd0527c56856609fb5bab1d5f389fb255593a196e483bd. 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/PLD112100022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86fecc94b12826cde5188388603d00a747495f5b8307d7abec5cef185141f9b0. 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/PLD112100016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb6af207feeab051c7d20f4f3cc31ef8e190e594d607bf49e7f169ab270c670b. 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/PLD112100017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78d10e69fd04695e16dd09d5f837333bd9f0ce2c0308cd6d234b31d77e2c7ff7. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/PLD112100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb94a6b38972b81e10818d5716aab69a1b0bd084d93f0e8d28614633d1409985e. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/PLD112100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c82d35524a334b5a4cd0527c56856609fb5bab1d5f389fb255593a196e483bd. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/PLD112100022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a665bb9cbdfb968960c523fd9b788446ca33eb0705107ec6d6b3d128371d47f. 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/PLC592200150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54a03de996b26719fe193ffa3ee6b777fbb726269d9c252f6d787b8ee59753ac. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/PLV572000010.