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 0x0d1843ebfadd21c0d56d74c870401e531c5d6fc86c19686e216168cf82030f54. 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/fb284e87-fba1-44f0-b7b1-521cab53b936.json and https://artists.proofprofile.net/proofs/artist/fb284e87-fba1-44f0-b7b1-521cab53b936.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 0x7573ea6a4f12b346357fb7512610064da54862fa2759f562e9c4f0d789ed2100. Chain 2 (Bitcoin): anchored in block 960161 (2026-07-29T22:51:26Z), 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/GBSMU3977326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbbd575a34c0f8350be417b3872bdc0322dae3757049f9f18e4ae92b65501c09. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/USANG2087547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x855c0d683789345ae375068a9141b537f78738a9508cf06f718e8dc12eff47cc. 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/GBKQU2241471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f292dc0b11aa12e505a92410636d95831ea3b66e3bc1f25223dedf8c24a0c6b. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/GBKQU2241472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x991204a184b9f4a6a810754ab4d7d8a4426d62a439865ae1c932e5948357aa7d. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/SGB502308565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12efdd69a17a5fd3086d1c2bf228c47880aa03a78b8bc35c8d30cd79b9661e5c. 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/SGB502320113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d768c7c449506f7b6e0805861fe9ac0860315e0fd545bb58afea1093fb66696. 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/SGB502314273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe8907287e5878834806112b468da094e33be90631f5f40c921ee17caab215a7. 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/SGW502350961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82b12f49bbeb28459cf6d482d608b5a3a9068e86a5ae7dd4e8f0cb112c94b228. 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/SGW502357141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4872acd66c16fe81cb2fc9e8e9bb416f9553cc6d2c376a3ab1eb53e6febf36db. 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/SGW502389187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x491f1401b838ca454accc242e9600733aec6f2d2052d0f0f6d9d9b91d6b05d05. 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/BEIW12400307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbabba27e2a14430eae909f515d876455f3f4c52e6ff97c3f5ef24ffb97783274. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/GXD7V2407520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47bf677bda82ba8ce24f3bdf1f0b96c7d9bb83d6cfc114356df049fcaa08675a. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/SGB502577044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca6b517ff2cbf472e345a801d961a63785595fc735bde6a523993d13e3255406. 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/QM4TW2471928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8635b6157f8e65c247eb6fed4a587e6d95052a3c40806e7728c3fd565c25a24. 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/MXUM72103389.