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 0x3010450165fc09aceb7b9ff5ab9473abc15d3577f308e566d1f84258c1feb9dc. 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/9c875421-523d-428a-b36e-ef825cfdafec.json and https://artists.proofprofile.net/proofs/artist/9c875421-523d-428a-b36e-ef825cfdafec.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 0x3eb5c010339a069667dd6a01bddc9f52e475e086df7cd3a16db477fce189ad18. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QM7282095494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4595900c8561e52e49d628170c11bc59d5eb7be9ee97dc9c40f94d3c284eaa8. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:03:19Z), 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/QM7282095495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe22b22c2f5329852bb8ee7dbf44f162a759a4d554fe0821fa40e75d59f2e8b4a. 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/QM7282095496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4595900c8561e52e49d628170c11bc59d5eb7be9ee97dc9c40f94d3c284eaa8. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:04:25Z), 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/QM7282095495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f7a5503a8b5f6b3688bf88b992e0c2a8dbcac5c2aac7fe9195f2559c8680e22. 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/QM6P42068391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb4ac38bedb2e7d46d176bb2823f9b61f30f753fcf76bb89890b1343171b45be. 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/QMFME2146441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36dd6c6d527a06782c5f8080924749186a6f819053ddcebf6a4c510c15bc0b2. 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/QMFME2146442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fb3b94a180569552f297abf92fd5a008ea796ddb8b54c0ad1a89ec97c96b9bc. 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/QMFME2146443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa062165412152eaf0f81ca24bd10f5173bdf5374bb85d286ce60e587dfb31857. 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/QMFME2146444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf186ce1545766f43fe3f3cc0468703c3251d9a849647d19dad7fa69fadaf3954. 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/QMFME2146445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86482d4641c11aebc6fe69abba2d9b4b70bd31e5e1d04c1390aedcb317bc9db5. 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/QMFME2146446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd061ff5822171750834a1af0b63a5947734cf15abb172f5cd84a3bb5ff54b312. 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/QMFME2146447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b8abe532b666bd8500346008845a0b3460e3fa4bc9398811206ce3757815faf. 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/QMFME2146448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e14b8d672a41f96b6c50c0f7206331a79c7f53dbe160b4a084efd9e2c78cbab. 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/QMFME2146449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x031ce7433ffcd16ed51cdf5cc3e86c4c51a1993d917e4dc3ee595ace21589310. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM7282059089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06f0f9befd2537e38f6a39b87a0bc123a898a0760b3bf35e29a7079ac6706de0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM6N21971446.