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 0x605bca9188a4cd2f1e906836fe7634dfa89c2289e8d2afbeed6ba1b47343add0. Chain 2 (Bitcoin): anchored in block 953596 (2026-06-14T06:21:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0a140b06-2c4d-46e9-81ba-b5106e6b9ef4.json and https://artists.proofprofile.net/proofs/artist/0a140b06-2c4d-46e9-81ba-b5106e6b9ef4.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 0x0b68909d9d093c2b666f56ea8526905c5c4dbce6e2fac41f747103786c3528bf. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/FR2X42581742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe610802c1a4e33cd365d744f2ab6ee85094adbe9bed27810e9da022a75ca9884. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/FR2X42530569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd78b6ee406a6d3fa95d22c864fa8fc6985492aaf2a341b7ddaae770dff11f125. 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/FR10S2592772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdee437656dae87e0e801a289b9ad45298f99d21158d2876e8b904dc34baa0595. 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/FR10S2592923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eca682adeb7254c2553bad445d96f8eae4ee0aa48a43ee658c3f225d460bec3. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/FR10S2583180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8bfa4556b052a52d2e28f5feddc89603d9d8cdc232a7c8b48fa9be4e2adcbdc. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FR10S2527587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6ce5644c7ff6715e62f5763f588d3c58e5449dd9429017473548a83dd96c238. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DGA0T2445530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x293f106f8dc2f7fa396748385bdf7416a57c9ad7b859beb2debd427143b98a05. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DGA0T2445433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbac69b3f2a627e0a963d25e0e3371944f07b429c66b6acefa45381255093bd23. 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/DGA0Q2408121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3cd8b2074e6e2ba0554c667e0ddd8964622e148f57551bae51ba65e2b393bc2. 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/HKE022211862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x563e85b62787fca653599b18525ef995d8fedabfb70ef1bab59d92cb68db0a32. 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/HKE022211864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39643609bf67e8c8d75cfbe918cf4347b6d22337f4ba1c2b9c2ead084507c161. 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/TWU712205603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a089d109559755a1fa6cc8c77aabcb8d3e26b6693b3145b259d6e9627ba4a8d. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/TWU712205587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46eb96c2124deab9048233e7eac26a8511b82e819717690cc0453af51518a26b. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/TWU712205448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c5ff5fcbdf67eb19e80059d4cacd109dedc6b94ba01505415b0363ec6b8b61d. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TWU712105883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x910635992afc38a57943f6a69c76faf6c6895ffbf8be47c244cdf82116e761ba. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/TWU712105996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b2c938b5d661beafdd42805d2220814ab96217df10a7c4916989bcc01a0da8d. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/TWU712105646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd669ea894eff58121a499af387e3adf7613c4b3454c2d3120b0e43b79f13e140. 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/TWU712105644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b2a3ade9db22f1bf6365ebeef4dd5b8bce634160d40ade9cc787e5635c7f43b. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/TWU712105385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfce9d3b961f0c22f94ab18e19d7343dc5cc244e884837cb4b0de1bc7e1a69fc. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/TWDL72102502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dbd5e6abfe8c07f8ec63af9628ee730abb01232b78fa191a8c54beabc6635e1. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DGA0T2446884.