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 0x49763819fd0425666ab75ad51a83420786244bf04c50a4d4de8598e5bd3048de. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/93bdc3c6-7260-45b4-930d-958c02656fca.json and https://artists.proofprofile.net/proofs/artist/93bdc3c6-7260-45b4-930d-958c02656fca.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 0xdbcac58b96e633737bb757bfd6e9eb8cf86612b4237fa2739a052f171d124028. 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/TCAFP2172472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60778132a8628c276dd06032b01ee6e20c1f4a750bf76d7f8df18b7e46d68100. 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/SE5752482283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x615e9d0663c89c2d7da8bef97767d8bd49031a108af53ce1a68bcc7b58ec18b5. 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/SE6QE2390119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f0b9c2ff888f8520eafb183b9b040f0808f7f58e949219c067033c99ae39f16. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZTRX2391083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb0f49cef56e2392f2c7bac64677f0e19f1f0a93df16cfd0b49a43053f82e242. 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/SE5BU2281795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73f707e459a427e74a4a3fdac5c1a5fb10e7670f108e120d3d3c90899f31a456. 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/SE5BU2281796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d60469ea1f0b7210c11a94de223bc0c34e90161395515464f5f3198cbea44ba. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/SE6HN2354069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc29ff49d58b3ac46a879aac8675e5d7ed4cce576ccd51176022be310b3c54f92. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/USHM21974129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b6271dd94c987004673d38375b33278903c84abb7ce2fd49674ae586f86363e. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/USHM21974131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43212890c438689ebb71cccfeba947dbecc394c9f1d47b56d270c9c7fad6ab90. 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/USHM21974132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7a195a5491852acbc3d9732746793eb45e40d8d6eff9a6083a6d9eae16f8720. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USHM21974134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x263124b48a0e3ef3746b81fc615625331ccbed271971d60648ccfa5d08481a9b. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/SE6XY2518675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e41db7fa9062a1afd5aed5065b703e0d74484c17f9eb3242d80a6e381c5ac05. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/SE5752396940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc00d1f0953b1c951a7f8905bdbaf36b16de8b9b87c0d8c3b41a211930a301bd8. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/SE5752332733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x199eba4b63e79e9d903d45cb3fc495f70c9a5eb2713542494adbe3360f9e7330. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZ5AB2176209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff3b16ba8a40827eaf8a3635a3e72caf047e08199a459669258eaf0f060c6c60. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZHN92093094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x033a34cd5c8a26ec80c1895f35f846f78ab4b5c9fe10a3aef0d542da1efa7118. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GBLFP2111853.