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 0xefc39b7f52a864949dc4c628f97770bd3f1b6cbcb5d1071a6cbbc5e8a2e416bf. 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/f2ddf32e-9095-48fb-a78f-68de78f3173c.json and https://artists.proofprofile.net/proofs/artist/f2ddf32e-9095-48fb-a78f-68de78f3173c.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 0xbee1c344798a3c7b87034583b7b84b6c8f8aa2966857a9e1210767e83d9dddf1. 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/QZTAU2323156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x799b901feae60882c8476b5cb2caacc2b4d23df5a83f864ce3da02a919ca309b. 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/QZTB62306207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42d9d7b75ada8391570855d43e0da7a7250392c9b03e57cb6e53cb1e380aa237. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T14:08:37Z), 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/QZTB62306212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e16a86e84b15c15ed67221958aea4389e48ed4b33a8c3556e1020181761fa48. 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/QZFZ22544554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d05064c802e54830ca0bb6f7ad775ac9c9c92497d018193bbc9f19d5a7f69a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZFZ22544555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b42fb895bec8968bb66ce2275f3c0d0becf86d3b7618ce4b504f98670824d4a. 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/QZFZ22544556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f104e2adb07b34f0fa6d6f81cd78d0895e187a8b8b812b885932656d0d09924. 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/QZFZ22544557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b10f97740b6e0fe98dbb225fbcfbd15c3abaccfb6b63f1985ea5b2fdda0377c. 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/QZFZ22544558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bef1d35970c4c03f5d59047108abb2b2d3ca9f5510aedb80aaff4592b4e77f6. 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/QZFZ22544559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29868a78e389fc908f2acdfdb3216dd52586e925177c67e9713e182677fcd08c. 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/QZFZ22544561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x341c8948bb60520f29e855faa90ca75840f3d17de81b0c6a8ec9f90a42e0cd50. 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/QZFZ22544562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8161afc8d910caca1f0fce117ce5471d116f7b7bb953f92c7425b622b7512747. 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/QZFZ22544564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cd36ab84e72061d53fcfdb6adc2dbe81a97c3334ed83edc0f4bd12109ad9b31. 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/QZFZ22544566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc74f6811ab88b27d29e30a7dcf4236e14faca0850554bcb939fe57b94bc875da. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T14:44:44Z), 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/QZTB82576043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd82eb99ce49afc89b3168fa58be83c77701c22c3e5ddb8b5041b3061b59345d. 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/QZK6G2405237.