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 0xb711300edfa9ee89910355e78665fe54446fbef6fadd6564f2296c2ed5ad58ce. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f4c88a19-8d98-4e9e-a33b-d8f16d448d64.json and https://artists.proofprofile.net/proofs/artist/f4c88a19-8d98-4e9e-a33b-d8f16d448d64.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 0xc6a6bc59a9b15d3ddb3ec47a4de2afe1b2089c5f7cc7797ae4d299d95b1a6237. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZZ7K2432286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x491ce1622147f916aaf3d9686f00641d3acda04052d40ec998f7afe0d12c20b8. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QZZ7K2432287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x863e3a67c18f3c22efb11f12907ee28055df287f2e24b2ace2d8671263f6b71c. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZZ7K2432288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf902342d588e3478a8d64c2d0c6ab3ca4d63a4fa2c2ad684616725057086959. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZZ7K2432289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6960575a3dc5df3e1aceb7ed653be5bce37aab04881b81d17674aa2af1f65bd3. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZZ7K2432290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf35259303952079ada09de56a630be92689121d407dc7ad8c113b31e5c32f301. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/QZZ7K2432291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f62d8a1813ac44f3ae4e10ebd0a0d3c8bd0edb9b596b92be4f99fae9c53e4c6. 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/QZZ7K2432292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x928829de8938f633ad90a7bc515516ad9c14bf68e8f7e919f7aead2e8a7ebe1b. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZZ7K2432293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc582890bb1bea8425b01fb5869ad61a24125e0ef12870934a70e8b39ff558acd. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/QZZ7K2432294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a3e25bf233dc9f426cb202dad42144bf9de282c057c1aec4375d4f91054a213. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QZZ7K2432295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0376785cc559b379d1f2bfb2f3111f1ab00161d85ee2fe2a029c58682737309a. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/QZZ7K2432296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0744c6b3fb9d9dce653fc197cdc57ba25d9fef8e8bfa673bf81ebb4c9933a0ca. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZZ7K2432297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f714d19afeaf80780e3021e686678c49bd60bb753aab479c88a95807fbcb71f. 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/QZZ7K2432298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b04f4402a569043555abddf08d84281d384999ef6f0c912cf2420f56a7abb07. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZZ7K2432299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0bb2f44dfaf5521b9ef0dc75cc15cc026959508f1667f389dbdaf4d19fde43d. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZZ7K2432300.