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 0xab4be21a296f664fb20666c1234df3175321d900ba0866f3d35d433442cface3. 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/bad9f264-a5c6-4513-92b4-9d9816d9c783.json and https://artists.proofprofile.net/proofs/artist/bad9f264-a5c6-4513-92b4-9d9816d9c783.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 0x33cc901b0149e43f09bc6fecd2cdaf8b23d10a5b362fc1fa5b86d4c1f47e35c6. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/TCAEK1961287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68ebf7485f71f04e693f61b73047e1053e2302d598a529c070f401a532c4680c. 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/TCAEK1961289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb72266d952e40da0a6ecf68c58d86c064744ee8fdd8974e0651e47fb64ec60a6. 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/TCAEK1961296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6859372c641c3d5259260ce2b978612a542641f422a7d9baff486426f765f463. 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/ESA011838396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x358d699ebfbf3a60631105979fb8bd0bc11671b37fb62b68efa4e47efe5b9099. 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/ESA011765693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4665495fbf4516d105edec3020cc736f2a47dcec35942725e3878195123e3a64. 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/ESA011765694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58dd4dbec749b11d0be1110871f58c58934f0a824208bb5df4f2c4f553202ef2. 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/ESA012122842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x129fe7c1039a11d87e78bb14270020a7799beb692c21ed0c422fcffa7d4dee3d. 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/ESA011842227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6483855ad820e380a605dd7178f1f9e5ce907643da1bc2ce99d94867c1044eaa. 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/ESA011765736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f5072e2e7d9534d1ec089c4bbab2b4047e0cea6c59119472d04926d083a3e7b. 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/ESA012159786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d4cd4a4ef015bb57d788b06db149d9660030933e62ca8709d7ee561e3e7c08f. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ESA092202352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf04398a1a9e862f113f6a397c8752db0d4fcfb39977bb0d4d7f7401e3887797e. 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/ES71G2309895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5387c346279e3f27377b07ecdc6b7f906db119de909ad24357d4b91830630e5f. 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/ES71G2328790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0bc2d41ba16975fe2cfc8e40b93bb39eb4862c0b7b3bb388e3cc1481866e7fc. 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/ES71G2328791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2051b2b8d104a60a2306ecc2ad8fe1af0cededac2583011586bf38eed2b37de. 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/ES71G2328794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc684e056ee2251fa0be8da1e486e537ca1b88cd8be7a7d5a66e9cc904b437cf8. 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/ES71G2314553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a665dc789a629232c8cf418dd645464d5ce3814402e33be6c06d53ee35791c. 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/ES71G2328796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8c8a20f6cbf866aa8ce45f747eacd104478008bf7bacde15a6700d972dadc25. 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/ES71G2305476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9869515978841bf797c5d084a6b0678e37fef9f3da6fead554e4b558ff5fc69. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZZ792465774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cb4bee5cfca676ee07dd3eb9ffbd09d269807ad714a30b17a27f243ba70fb10. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T05:26:46Z), 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/ESA092508221.