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 0x3893728cabd8bc96541081c0315c9045131ed178f1cc7f9904c5e5704fc92b65. Chain 2 (Bitcoin): anchored in block 953768 (2026-06-15T09:30:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c0110b00-1821-4bbd-a619-cd6e7a4408ad.json and https://artists.proofprofile.net/proofs/artist/c0110b00-1821-4bbd-a619-cd6e7a4408ad.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 0xffb2331edd9fa51b8c3eef1bf40953b92fec643ecbccdca4bb9b51b03cd52f21. 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/ES18B2102113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28825241cf7d28337f9cf6242f96dedc149c7f6f89187948be93c5926d94b591. 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/BK4DA2500698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc784279f3d1fbf21497c58e5e20fd63f4d33ecf23cefade11cc857757e9f896. 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/QZW9K2483862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2e302785a468cb72b29ec05d355cacb3a87f7d76196becfb294b6c60af5518b. 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/ES71G2415579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4845ab9dee8c117e9d5043fdc9d7a452805d54d715ad30d9ca62e3ccfc8cb0d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ES71G2415585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe94bf0d43f4368c2c1f0271e56a41280dfc209c3573ac1d39100c3d9671a644b. 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/ES71G2409820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29cafdf4c060b924a085866502c20b10a666f80a0c300c11f6791bc2f2f24771. 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/ES71G2415583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x176323ee2471b20256c764aa176f85874dd97fa623fb1f74ec9938ef8d6bba01. 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/ES71G2415580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x175e85bf0053d1fce1029de009d0a4f257af482e0828be0efba792f65d44f60a. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/ES71G2415577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9ed677a18ed986607ba472b1fb463d3884ac236b979360e2252225aa36bbd80. 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/ES71G2403096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x013cda3405088f28b831f9b8a18b101c6cab59b47c2e8e79bcafe59305296918. 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/ES71G2415582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ebab9e2ef36c396877d1b68dfa08be7a23ea82f41464937853a668d40f5093f. 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/ES71G2415578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79276d73e370aa528741b52997b9d43fc4696ad02a686b1735fe64eddd0dd7dd. 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/ES71G2412759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7df1a650e48f960015c564085d7700df31daf78257f1e5b88b1dd74b30f3f4c9. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/ES71G2415584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdd095d9023f65638ace74c4363772f62711669b48bd653f86eda77f4fdb5116. 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/ES71G2408513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc928c2f65961b0e58d5f3e639348764a167770bc7d31b31f4a2b7e1ab2e85bc7. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:31:41Z), 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/ES71G2415581.