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 0x8025c5ff9b5ecb863308b05d8e572d7aaa4b79c9165ac82e958867fd32864f62. 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/933aa1cc-2de7-4241-bdf8-f28da13d7a81.json and https://artists.proofprofile.net/proofs/artist/933aa1cc-2de7-4241-bdf8-f28da13d7a81.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 0xe1fc839981d638d818ce0ae10d267a283e6a2a9882b7a3e9592bb7947a7eed8f. 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/CH7812227676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e6cc83e3dfe9758184ac7a34e9d239318b403e47ec5cbe1920170cbe73c4da9. 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/CH7812344044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81e3d7a15799bd430cf87a667b3e225b384e90f733f16cc58b8ac29e16c1f147. 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/CH7812344045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x782f622c8448e059fbc4c43210f901fc12ee1d0304ff475a4be389812f454bb5. 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/CH7812344046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1fe0de50e75ff2abc93287de0a6773008e755e14d25edb87f6808d7a636a987. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/CH7812344048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d7ade221a314a026e330a1b63af3a878b592219f3e8bc96862a97f08963d6fa. 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/DEA622301080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fa069c4216a825b4c709fe5b30378f41c5368fea2f6f0b8cf7ee55395759bb4. 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/CH7812358020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaba49ba07aae0b01ab5e99b391a401d8e025a9f140280d0f3dea19bd30b556a. Chain 2 (Bitcoin): anchored in block 957867 (2026-07-13T14:55:20Z), 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/DEA622303096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc398ed162539d442336cee45d69a4be22739b6469e3f3438e5be511bb72d6357. 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/DEA622303097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5fab883fba40d3488668d57e4d02b84e8b0264bc6fa49f60009df98d9b4aa8c. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T13:35:44Z), 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/CBEYJ2552922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6285efccfa1af16a7e46bb63bab828840f324c333f72cf22076c37572cdfcd66. 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/DECE72203604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda3ce0c386c504838dd8396d44cae7534dbb450bb4814e4b49cbef043b1204d6. 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/DECE72000177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc5449c6566cb51bdf732c458721fdf93849791ae6dbc49e9574cbcf4482d68. 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/DEKF22401696.