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 0xdfa176a18b4e5c430644cfec2be6944f7ce05c53e05b15088c354fa1f1acb937. 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/111e285e-28a2-404b-aaf2-5a701ad32c17.json and https://artists.proofprofile.net/proofs/artist/111e285e-28a2-404b-aaf2-5a701ad32c17.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 0xc56ffb786b68d78fbd9e40b14df303e7dfc4ca8585307eb5a2d506109a956586. 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/QMJRF2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ce6e9427fbbab4dc7d9197db304bed249c167ac65c8a521bf3b809e940c3dd. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QMJRF2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774d13cb8c91592b6c39dc24a3bc3ef4f94e4456a420aa5ddcc3bbb8ef6389dc. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QMJRF2100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58c7fb230745c360ab3bf37a57beeb7069e8a81430c6f3c320642278860cc5c1. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QMJRF2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x313ec8689109929456e723007a5a1f806860500f7d6dd86bc3114be0e457bf1c. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QMJRF2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a87ad05ce0eff21d41292071db357ce2757104be5a742eac8933d99178f4189. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QMJRF2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73fc936adc40df9f03c67e0c5a64659282c2b4d1a24a3279ec13b1d374acc0bb. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QMJRF2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d62fb880631735747fc857be8be9f3d1acecc9195fb6863b9d9735f489ca51. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QMJRF2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc83b07db0f6e55dbeb17fbcfd4f6068951c2eaf14269c49860f142c7185ca1e9. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QMJRF2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe49e0aac2acc0afbab3b1b5b8ec3ad1e468d98ab1d2c40ab0f678d094da4f034. 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/QMJRF2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f98e6802f934c352a6966da59f59aa0fe24d09240b221ba81b7501a6e79c3f. 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/QMJRF2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2d844c115c12863bf5dbf0be7e097e5ec1f45cf016661705795074e1a3710df. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QMJRF2400010.