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 0xccb236f0f01ffeb2640d2ff3495981586428aa8d467de7b49e4587e3b36afd64. Chain 2 (Bitcoin): anchored in block 953812 (2026-06-15T17:06:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f66110fd-e5fd-4eae-82a9-d7c03cba57c3.json and https://artists.proofprofile.net/proofs/artist/f66110fd-e5fd-4eae-82a9-d7c03cba57c3.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 0x4911316754c79b23d470aa388ced337c7d94470576b3a696d363a0a67c6825c5. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/USHM91353660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed85461b25f145a5198070e663ea2a2f5a80e0ac569f0de3bfcd2804de21216c. 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/QMAAK1549843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ff90351db582dd753e48b6d708fcd4cc8949ad7efa7308970657ddffafd54fb. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QMAAK1549845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36dc241e5d9071cec7e279303d319820a4a264d53a36c83ed0ce4f115a60690b. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QMAAK1549846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7fd25ed5ed18fe0ed752cf9b44bbcfd3652e490a069ded2c4c0d69c7203d9dd. 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/USDY41683897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1b4a058829f5e4e20d2970c491568b153c9cc9e50af285290fb6d09f3bd8d38. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/USDY41683903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe261fde26dfe9a71e0bc7107c195f61cfba04c60d37efe5b565782ee12a27083. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/USDY41683904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x734f2418dfb6a7ba2e11feb5261476df99993600c3ae8017ffe2f841d6065de6. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QMAAK1761330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcee5e7dd600db20157fccab36ea72856e8823e0f17ff1e9bb76549aab9463e3a. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QMAAK1761332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa138ddf35f80c5e0d8f9307c73ad8fb57296bdc58bf70993cc5a560fe7378cdd. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QMAAK1761334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd207eb70fd2606beba3559e6a89ad7b7520d2e4fa4b2f1e0a2a2abe7064d74cc. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/USX9P2384976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x368723dd8bb212f5bf3c0ad1ee160cf6f5128921c74c767610798df92863f7a4. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/USCGH2451755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74531c9c13fffff320014511a8feb4ebfff96d9fca43f4bcc0f9658408bacdc6. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/USHM82401814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba88799929a16946ee14d3fefd2369b263603fda18eb877b87dbe883c2666b51. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USHM82484315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eafdcdb5839632df36debce06b46ca6184b5eacae7d4e75d1f6b9bae9ddb357. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/USL4Q2472135.