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 0x00d9c639daeab66d4fee276c31c12d0581175075358d11a9f9936508feaf7b3e. 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/137e3da7-5a4c-460c-b57e-54df426626d0.json and https://artists.proofprofile.net/proofs/artist/137e3da7-5a4c-460c-b57e-54df426626d0.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 0xcbb367a5dac1ca14d2009978950de0a9519b665519dfc4c88c514db22fd5c6e5. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZHN32366221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2ac8d8fbf8dc4ca038908c154ce4eeb31f0fec616b8f4e23956109ef2d1ec66. 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/QZHN92395124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb48ecdde0c10e33a81d03b350e039eb93214299d14139e3369ad98b7daab196d. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZTAS2324272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b2b1dc88ee2ef202143f578374fe422bef243cd05bb15a1f2b72d6ab07dbd75. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZTB62381562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7187bad65e4dc60c6ecddb554a5a48e24e7f11807ad4fd5129a0d7812af6182c. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZWFH2322242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d27d03c009c590a48fb222024ac7e14a09483ecdbfcabf1164d67aaee4faad4. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZWFH2322244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13da21068478a6b8a744f3eef1b4d5da03bee48f95673619847698db678f25d5. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZWFH2322245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x986a2a35e0e93253035841b70da1dd78e62cc7b89f217ca6f44afd2df0d62e3f. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZWFH2322246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0285eca1d22fd7be39488b6f53dd8808d4f135e3318c7655a33d6f469093f2c5. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T22:19:10Z), 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/QZWFH2322247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c777384fe05a4cacb83f4d30f1bd238a5a27322050ddf0df1a7b5e23f7e7e52. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZWFH2322248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0fd3d4c72fd219803916d615697ebe95235cdebd365d4c4dd2e0b3b0c7406a5. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZWFH2322249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5f1f719c7a2b12cc4dd352568f205e1de9ab262fe5fd4038a0855b9b9a7b76c. 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/QZWFH2322251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f815cc4ea9a13b728a6d5d97e8777583bbe1a0b86fc1c5529c532cf6722031. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZWFH2322252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0ec2b9142c9c30398a6c8889babb91cc5857865d292c4b63045bff091d79688. 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/QZWFH2322253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c8db9b410f8d7527a5f389634e5e517cabd8e5f3adc102d6a8a06c292f30fe1. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZK6F2404432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1039e2d9c2e872c776cd551043150c398649150888d6f5ead7daa8fcb2ebbb34. 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/QZK6F2404434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c387a828301f324248c6f2f16bf0a2a63fd6779ded4f11f3b2cf9580206eeb6. Chain 2 (Bitcoin): anchored in block 958828 (2026-07-20T08:01:44Z), 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/QZHN72485453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fcf6e88fbebdbc2b6b35babe39e5cba8812948e0f71acf0a4f05fd243f3d512. 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/QZTB72457825.