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 0xdf56f264e0fc8420a8d4a5bdf087542648e518e8672aaaba56e66c022841d952. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/34506ec5-4f5f-42ca-b9ef-9092f0f4a55c.json and https://artists.proofprofile.net/proofs/artist/34506ec5-4f5f-42ca-b9ef-9092f0f4a55c.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 0x97bc1cdf948b45afbe7bdf0cec6eb6c014fb2d55d2369cf4a7b8cd0f5316cf18. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QM3DF2270562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14e03b4bb1b7181e6dd443275aa3f558fd364a6b933882732f092fae90cec9e7. 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/USANG2230524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa85c5c69c994304321a52ca57f112c5b803c42896cff782fb483366dd716c240. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/USANG2218280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c1d0f5873b82f908b86bf067124b9b03c6c2d604f703a27596e359de4805126. 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/US3DF2420209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49605c0d5742f85b9f006a4ce59dcca62e7c7884987cb895dbb754e6bd92743c. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/US3DF2420210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c0980c68520503c69c7612e31489fe9b73bf3d94494cf8558ff91c44e809c35. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/US3DF2420211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6789d2187f6d9eb0a74980766d87b117500fee280a882fd65c57d818a494d1f. 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/US3DF2420212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc21ac969e25b439995eac6d74c3224b1756b8f98ff4af8770b99f9d0cdba54a. 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/US3DF2420214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b9663c54df135b61ae7772bb8380d39e9a13f1d61f0e3fbdd70160d929c2b0b. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USANG2294359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb2015cc313bc30e403f3f9907e8cb53dcd393e442e04d662a8a389243c57471. 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/USANG2294361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0ffb92658ffc0eb2946dc5db7da1301641716dee912e22b13f9f9f3e52bbd97. 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/USANG2294360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51fd280b467aa77f52cf36151425f22516522a155b2cb34e44c7038e0aff4633. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/USANG2294376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x401225eea66f63232dbc9ba3ce8e84dbefd1eb79e336ab4f16357a807b969ced. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/US3DF2472862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x132d93265b0de46f1b0f91146dcef11244293172db8dff26665833b0e70518da. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/US3DF2426411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99094a1c23a997f347318ca294ccb14971ecd5455adb52fc90a494e911eeb051. 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/QMANG2229291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb15766365bf4e4067da13d11c846f3b7d88983304a91ec45150e4a5512c151c4. 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/QMANG2213732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e5cbd10eb6ac5e25af895eab19ccd500361ae008a1b9329b2c1009fa5804084. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/QM3DF2290163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a3fe827568ddec066420936615f6931f8ca5c173ba7ee915e5ec4b193e50a8e. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QM3DF2226038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c1d8386d1cc2001daf3fa510e9502f9927d68464d1be7e9cc81edacd567aece. 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/QM3DF2215471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32329047cb33b8a362c330e116c6a53a71a02b7f6f9dfa0f7e3106e3c330860a. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/USANG2282577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5969f078b7f2d211000066fc46a1cdcab5c3b5a8879166c7ca4348b1d6e85de2. 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/FR59R2355418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccdcb02d2528369a202c47b1127ca40cc2260a52ca12cee74508e1eca0093b39. 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/USANG2268084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43c5e9d08452469af236795d38563e89979c1d9a99af06000a691468c31f0330. 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/USANG2248177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb269c8c72c01e9ef7b897b5f9320651d6259617ab0937674c805962efb9d81c9. 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/US3DF2296840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c0367e9b4e74e83c0f9799ad0ac46df788b78c1981e78db38294644489d87dd. 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/US3DF2260903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46cbb82cc01035927700f3ed38e69161511e50b9efc65d501d1d4f46bcf9c3a8. 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/US3DF2249940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bf30c27cc473d02963e0c4f8bc1501db3a7552eb652041f58c8c5e46871be37. 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/US3DF2510808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf926760bb7f88d3c4bd84c76b64d1cd29cd039a96091274cd17f8b3e93501402. 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/QM3DF2417759.