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 0x2d9f2b7c4c8db91116f9f23c8c9b2a1a07682c871c33d6dd4c1392d96e1687b5. 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/4fc4eb19-50c0-4570-9a5d-87e0d1839110.json and https://artists.proofprofile.net/proofs/artist/4fc4eb19-50c0-4570-9a5d-87e0d1839110.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 0x3cedb823027eeb3dff9d033ece785578ebf4c62d168a3a97efe0eed177dae21d. 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/GB8MX2000507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8154f79f10c3e361b71b6f5f139e56692aff4e23729d9cad4c438fd30561cca3. 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/GBX721900380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e4e8bcc2ef03dd5da925ffe68eafbd25fb2164593b253602c11b6d2a7da549a. 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/GBAHT1900663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e4ac47d3815a565acdecc0661c9d0adc2ddb7ccecd29b5e948fe336e6cd845. 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/GBAHT1900665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe5e52cbf305b7c73d225ed5fca4d695dbc261e2ede0ff1aab41177a81a90eb. 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/GBAHT1800678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x128abc18712a11047f48c0147345fe9bcac5a154b31520a69e2ee037bed0ff2a. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/GBAHT1900128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb5f4472955a31a477f051c41db5afbb43d13fa3ed7f0d3c2fee2c2741f716fd. 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/GBAHT1900392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47debf90ec1b50bb08100f7167609b3b664e5f8ab70e97a6d05408ff3c1a4414. 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/GBAHT1900393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x128abc18712a11047f48c0147345fe9bcac5a154b31520a69e2ee037bed0ff2a. 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/GBAHT1900128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe5e52cbf305b7c73d225ed5fca4d695dbc261e2ede0ff1aab41177a81a90eb. 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/GBAHT1800678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0cac4c03162be941a15f8d9d5cc444ac5611a0e8bf1f5090225e6cba12594cd. 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/GB8MX1600405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66ab19a3b2df015c214ccbd2d1d4f3846c07143c9962522aa400932eb86359d8. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/GB8MX1600426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bb64e4c3dbda48c56ec601ed74ffeec88a77d798685d6b9ffc07f0e98c7bbdb. 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/GB8MX1700003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1886852997e8cfbf2912b5eea499f189b311d3a4b6d73ca0727f2ab91e2356d9. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/GB8MX1700007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x402376a775171c4c12cf2b89d487820df8327494852d787e8d7284d6f2cd041e. 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/GB8MX1600021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e5f648532f928f4a75b9ed7946d9560278d558bbbc3a068259d624675b9fc7b. 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/GB8MX1500292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2c37b03c03ce1de18e0351c9bef17836ccc67f951c1b3ccab83ce2beaa38628. 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/GBKPL1512337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70673ece03e9819c1c9d360206fb4c87ddf3a1ac9585410ebe3b38c07dfa0b11. 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/GBKPL1513906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8e578b33930bab4af4ece7106b82a4f19c04293c9a1af1663ca076e0cb91309. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/GBKPL1513907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b2e6a56288d599864ace5f334d5cc3b866e66e24043552780528e26f3957e0c. 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/GBKPL1513908.