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 0x17c4b3117c52f95a3fbee6058f5b1e4acabeb27f00f0451459ce3667299d49b6. 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/10ee6c59-d81b-482d-a7c8-3265221e3bb3.json and https://artists.proofprofile.net/proofs/artist/10ee6c59-d81b-482d-a7c8-3265221e3bb3.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 0xd1cdd6b3be9397d6c2ab95536dd4068a3a3a54b68f4d9c05c7b69be0d482607c. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/QZZEB2468719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad631069d6854472f2e6211e246bc7001a2e888225856b6e041e8a73eca9fcd0. 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/QZZ8B2468408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a1fd709e8de603d4517e21f07bcd0d22ca7b7dabe9fe14bd5fd260c54e40cfc. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/BXIV82467251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaef6947f3f9c575da390e42e644c5c733e8944d957c2ef283f5728ce342ab2f1. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BXTRN2500659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b2937debe062c79514e089cbb8a50ffd373e3b2858a381594cea3ab6fe5d424. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/QZNJV2521161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb92fb0d0cb1022f2db38668924c6cb27a4a09dc2b0518caa9b42e786d56b40fe. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USLZJ2507605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98703a3448ee829c90d21e0283cafb964e511acc28ee3ba2ecc67dadea376035. Chain 2 (Bitcoin): anchored in block 960210 (2026-07-30T05:21:45Z), 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/BCL2K2400264.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21358f593d4accc809a3548ae725f4434d26f62c7133e6cf8eb278898f8c5bbf. 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/QZYFZ2428334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbbe5d9b5e4a03114d85d71c93bd0e7491930b58fa7b6389718c24a4fc5af50a. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/BKD9Y2500088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb942fef9dcd402d137a0ff96e4783c5ddbcb43403a4b5e1762f231759da71690. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BKD9Y2500085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80a5d74461c7e971914d60a444995cb0c9741502ac062ca3627d2cdbf788377b. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/BKD9Y2500084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdf67c4da2475fe4aab044633bebf5cd7f4155bf58dc551a6862f2db02f90351. 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/QZK6F2101499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2ed992c7e337301d6282f4687ae6db79e4c19693067ada55f37358fa23079b5. 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/USLZJ2585655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c1d0c48bbb921851639d4a894f2091115a9695fdd65b2368a984bc3eeaa3349. 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/QZNJV2248708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd060e7de76d975bcb191df0d5fb7261c5069d7195b26e2f0c86c21e93a8c9106. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZNJY2259531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a2d40f29b9f85f30f530966ce2d4d77088a674732db0dcecb137faa0febd204. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZNJX2356018.