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 0x0f75f910b34e8b83302f836365b1ff44497f14286a8e2c31d76f2b64ef2c1fce. 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/a3a4521b-cbbb-4a09-a613-e9302451cd13.json and https://artists.proofprofile.net/proofs/artist/a3a4521b-cbbb-4a09-a613-e9302451cd13.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 0x8c47ee145a44019dbb4cc41df547dc3581ca804dfaf3767cccb944d1a29623b5. 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/ITBGD1700014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x952d5fdf41b03e205535fbc7b9e446248a324e4ca58656f71a6d8ccb782de11b. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/UKACT1914988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36139a511b1732de1a409f2758f8d49c5b912409ba79b1592cfa5485138d1393. 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/UKR6V2076848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1d1be0d638712100ca227205a149fe4843080a2111057c4f5eee31020030820. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/DEBG52200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x831377b233bc13a442a4282e7aa27fbcbf14b80f065334bb8ced8c7329536a52. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/UKACT2232599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bf267ea7f340d96edea1b52f6c30aa127a986d2210530488c9bc915829aa6f4. 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/FRX872308343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1496f202a8224a473e646ac6b8884bccb7f10343b1fd5d61d2cb2ff4924831dd. 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/FRX452459178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86d75b9e153342a4c5ed76d2bc906fb50b79a16043bce350396e195b648ca7c8. 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/UKU932482872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99ae684768254544a66dc9eee3b1f063f3144671fe805aec7edb7c2c2315b8f0. 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/DGA0S2461739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06b706c5e21acd228f6825f055a3d60792376d7435f7a8861d6f763d6c1043a7. 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/DGA0S2461740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x542d9251b679c1c2845ed8e907e0a137552e2bc024353d92a393751e0ec1938f. 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/DGA0S2461741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf35071d3d8072a7830bcc4f3d73a3c93280d226856deb248d7bdfcc4564d7a20. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/DEH742506658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aab7e08849b9676bfe240021d96f08bfbdc8aab57400399aeb2a27c7688288f. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/DEH742506659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5b357336cc2110c3ac53ce8b4f652517795899e2d0ebae933adfd1425cbcfe8. 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/DEH742506660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10bb6ffef0748f39ef60911b2f4b4777c68123ada2239feb3a26f99badace4ff. 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/DEH742519936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1d1be0d638712100ca227205a149fe4843080a2111057c4f5eee31020030820. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/DEBG52200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeb11f93398018976ba54b4ba9d992980cf5d0599c7fb19847b776604614c1d3. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GBHAD1901544.