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 0x8e770f552384b8d4987d213c5fa0c5672727671e2175f717e11335ccc1c24fb0. 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/121e46b7-a58c-462a-bcf6-8646dfa4b485.json and https://artists.proofprofile.net/proofs/artist/121e46b7-a58c-462a-bcf6-8646dfa4b485.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 0x7385e2339401b3c4a6b5aed2586de4bd8d98cfb1a3ab3f14184ffbe2ea2385cf. 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/QZ93L1958420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac685454ad408001364d863635db765fd21cab6ec9200149e3905befe3ff6b94. Chain 2 (Bitcoin): anchored in block 960355 (2026-07-31T05:49:18Z), 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/QZ93L1958986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd241230d001b4160063d798cc0d6036553732873376ce1375e5b8fe43e60cd65. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CH7811708712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83396f58171c84cac78413e582e2d104c4da2478439755e14f1fd0276e134bda. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZ93L1959395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48912004e8e7be32c922f65ca295f5440da215c343a36701fcafb38340610e2a. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QM24S1911271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b05a69700a3316a8ace94ead29a4e8079d05a37322f3a6ba43d6740a5368815. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QM24S1837827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x646afa70979938df3323bce7efb2b1637d9b01f2562e59190b012b56b81ff596. 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/QZ93L1959394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8dfa02d064bc09ada46ff10876cef4873a447aa3ddfa1c6f4eec1ab856bd7fe. 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/QZ93L1963608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8c28dbb96e228c63bb58695c51b3771f7b948dbeae8ee81d0919b71b756bc7d. 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/QZ93L2100815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0df6cbe7d4dfb67c318a95685a846c8a8d61a2146bb2db03e11f0d01f9f7d2a4. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZ93L2126178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee1fafb619b90b3c85cb190bdef6305c2cff8e11039ee7e892a18842e7826abf. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZ93L2123566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58be45336688c931ef24f45a9f3180d33b87ce95f50ad93e763499852376f8ec. 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/CAGOO2311981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaecd4ca47e99dc08b7068c6031c38375dca7b127774a0c71d2bbaf32a0db7b85. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/CAHQJ2361544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebffd4c4694a1314675b70a0233adac8677c82f0e675b198bf7bf9358a28c8d1. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/USDA12208647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa684221ee44660be4e86b1c14750728d8c38a94e1cfddb9a6ad8eb9b7cb9819c. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/CAGOO2312021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa980ec7829f9818e2a8b1c71d9c78a0b445d31318c675b8a097e44229330dc4f. 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/CALVP2402776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97c2d6fc6701fbf94a2df21e5eae82a23efdb1d3a96d02e2ceaef2d99c403148. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/CBEYJ2456957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x655af5dce81ccd3e3d61dd96d3d1d9361db9d7633b2f0b38047ccc5998963de8. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZ93L2118616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa72912b1b33db796f0f0dda91c4877af901617e74919d05e1aa151baa4245560. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZ93L2117314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0ebd194a240e755590293ea9d5920d7f2562240e756ec82a39052c3ef91bfa9. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/FRS182038727.