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 0x8dcf82de8b8f6efee44f4974d1d0e193fcbdc8a1590a8399e84ff554c0053587. Chain 2 (Bitcoin): anchored in block 953701 (2026-06-14T22:16:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/75c50b77-446f-4a81-aa69-6f8ddf4df02b.json and https://artists.proofprofile.net/proofs/artist/75c50b77-446f-4a81-aa69-6f8ddf4df02b.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 0xa45ddfe5ac473bd6033860947cf5070ca21dd8a7ffd9e6b9aca7f7be2066ca04. 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/USUYG1106509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab30544f38097f13d959f70f4f3c406536dfed15e1b090f211ed30c8d9ecc808. 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/TCAHG2329129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70a512b30bbe65629ca99067cdd4c1fd630326553d87fe1a135221b4bec9adb7. 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/USUYG1285429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75663d1349a523ae15db60f2088f59d45dc402711594f7db2518abff4e53b5b4. 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/TCAFO2195982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9c6b52ca5d12459d4f049ce3a5c48468764f9eed4dc3fc1fbc85fd332b05a77. 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/USUYG1248178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb80956fb2c7273dc05839cbd5c407cfccf7cb94b966e9cc0bb1fcd68b52fa386. 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/QM2592005255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79b6c53f1e3bdf845c7d53b308fa87d18c9268bed115ac036276d4878d147aab. 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/QM2592005265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60920599af7944dfaa2c973667a234f7f23f9ad41d91eafedf723a13044fd991. 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/QM2592005275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d362340cc2a4c9510eeb2bbe00d7e84ccd6c77041931ed3b3f2416e008c7f3c. 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/QM2592005285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a1ba39b90809e08ac119d0cdd30d6458ed4255d3eecd4c9b9146cbc9a35a08f. 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/QM2592005295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf658517de841a15617d924c593d0b0efc63b97f790dab03d85c25e223891668f. 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/TCAHB2350990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaaeceffd59bbac175ef01fbd8311dbce6dac0c030a635c3a269ef1e7abbc836. 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/TCAHB2377739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x867e698741636531ee066d33bafd6975df4b26dffeea821dff9d04acc784c4e7. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZNWW2105957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f8a0874decc6e6f56233383555a14b85f4b9226bf01fbb703b0343ddfec5d66. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZHNA2047279.