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 0xb6efea48aadb86cf59387732b1740b5774e15a911bdae3c24ba3623dd9dd573e. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d5a619db-a0be-487a-be65-70decac91301.json and https://artists.proofprofile.net/proofs/artist/d5a619db-a0be-487a-be65-70decac91301.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x96e497788ea49dc731ca183641644510ac44a3ddf9a3b5ffd88b9831d8576b09. 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/FISRK9600047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31adff4ae6ff4563ca0ec04dc78ae44cf679b40b7b21c06346842ca7d52e0bad. 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/FISRK9600053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf90d829f3850a75c17c686113f2d868d0d9acc73484e9bd0159b918d9f409c28. 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/FISRK9600054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef380185e1752366609c6d6fee33cf7d4d03b5446279a6ee82ba3b838744e1ab. 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/FISRK9600056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x333b1e08cf6febd0c112bfef250517ad1cedc72c1901ed687d588e2401b4d348. 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/FISRK9600055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93d4cff66d0b16de5041c974667a2d668e3bc2348f007c3fbf2474bee2ebf575. 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/FISRK0200058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf276c1c29ef08009f2ad8571c8975ecdae1296872da3be875cdd4f87a910342a. 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/FISRK0200067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb885dacab12d5e2aa9c00a942759444d0835de1c58525ed3f07668310b76b072. 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/FISRK0200069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcddb5f4b9acd7feea4115d7f97be50509f9c6c23950329b7b7d98b50a06683d8. 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/FISRK0200073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x502fcb94acc7c5c967175992888bfdacdc170b1dc42ab30fd2ac7c6e6c7e9b74. 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/FISRK9600025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8141594db0991911b90ec88fc63fd898347f5fcda4abc7325d700f0971d2c3d. 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/FISRK9600027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a92f57b77f91654df2ab6e5942f4137f84edf4a4bc01990558fb7f0973e79f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-16T23:32:26Z), 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/FISRK9600031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x917c5ed314834a88e55f1f5e5a0890248cca222cc1deb41f91ed3d27dba9feb9. 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/FISRK9600032.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd78e6b14a119ebbf6cef4f6dfbccfa553ff22d4bccc1ba155bea7a73c83198e8. 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/FISRK9600035.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x262feae32e8077432de3d0710bc8bd9d10f233f1fcb23d26157a8ea80118ca87. 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/FISRK9600036.