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 0x50887cce2ddae348c3898b91ff464f4a752a5b16776f91fc8990e8a7e6f849f9. 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/8fba75b0-c62e-4884-86bc-023758eaaee1.json and https://artists.proofprofile.net/proofs/artist/8fba75b0-c62e-4884-86bc-023758eaaee1.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 0x38d1e15fe73effdd426de8ec28ae221c5ad1528dd48ce4e7dbc874a90e3d1927. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/FR0W61934900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88e5c2c855360d47e2c150e139b22cc622df4221bcdc47cf4be691e029a0db84. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FR0W61934907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d32ec81d306e6be727c821b9be2419cb19b63d00cfb972fb93839f774894570. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FXR052400232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04b9a9cbf36d40fb3c6cd02b2933fc66eb0fb4558b94a0c199adc178b65d4873. 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/FXR052400231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b9ffcfa13f4420e6812e06870b9d49ca9272472d512782191aaf1815a42c023. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/FXR052300106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbccd016470b73f81c4bb4f9879903a6b8a35b236003b89b81aa76715973a563. 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/FXR052400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d32ec81d306e6be727c821b9be2419cb19b63d00cfb972fb93839f774894570. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FXR052400232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf78b205f05b2704274a6b38badc703dcfa3f33ca949c63f2370d1414fe1dff8c. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FXR052400233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6807be45ec0bb8e323b8a452afed3fbdf8ec8cc08560b0b93a23df5c2066f25. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/FXR052400234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f68ea33b15513c91f41387ed4205defe7fcddc822403308308472418956acf2. 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/FXR052400119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c1ce2426ea46cf60a4d746cbd65c33ce463170b4e7f96a6a4c5ebcb45ef068a. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/FXR052400235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59953ea7be45c6a6431ba4259605f819edcbc98549ea6313fa61b9453d0da8e4. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/GBGYQ0700728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9bfe44c42d1b46af12b6f4c0b2071781b04ccd56a2e3a734cf7df43c9fdad4c. 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/FR0U91400620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9bfe44c42d1b46af12b6f4c0b2071781b04ccd56a2e3a734cf7df43c9fdad4c. 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/FR0U91400620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x889002219d80fde94111ccf4aa9854e41acc258de30cc47adef44d1d46775c22. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/FRX202205408.