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 0x4e02a611723d6a243f600664d6b4e9cd5420a5337355f2f103c3e71943660605. 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/75f1123e-4dcf-44c6-9ec7-3065bfe7e557.json and https://artists.proofprofile.net/proofs/artist/75f1123e-4dcf-44c6-9ec7-3065bfe7e557.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 0x2a34a577dfde902caae17ba1e56480b3dc377a1952f06a30c75c66fec6f19bf5. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/FRX201839271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb75ba934ff952ea4d68b722e7cae9fa46b4342531918c83c1019ceba57a5e6ae. 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/FRX201838680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe543c15872cba910a087ee0f02c7fb4ef3f573485ea99712a79555535d6e045a. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/FR10S2075342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8230f778a7c5040408524bc1b0cf8b7fcd9aa22b0416892516e898284f05d067. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QMBZ92006813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x489a4be01fe868a316c26a0b7c09123d80c47136a76e90af126822ea8bab9fca. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/FRX452227478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63cb9b98a46c5e6487cb7edba22e99a1621d9ecff19a52199192ceb9bad66b83. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/DGA062271127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93fe1f0e9a4a9153b2134b002de5a189aa59221c101d7990a09a97f3aa163ffe. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/DGA052345930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc4a302e21021e6cf470d380fc51c6ad5bf26ad3f803ebb6a885b9abb92aedd0. 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/DGA0H2335312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x345ea4c5e2529eb4b968f3251eacbfc9a75afaa2d8fb918b6bc6f50395d75e42. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/DGA052474511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdb2454a28081b8bf0f3a1b9a7a46e6fbda0611d016831877ff3ddb27f04cee9. 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/DGA052474514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf2c4d85900390fbe6266a291c5de3218f8b250cb3da3043d35f3767027f174d. 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/DGA052474515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11f9c47a16c4bfb7b52f6279403c953baa2c0f0db3cc418de2cf8fcb15adb077. 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/DGA052474516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3c18a111fbdc99ae363ae732165ed0a47f013e0efad9ad82057ca5520269858. Chain 2 (Bitcoin): anchored in block 957867 (2026-07-13T14:55:20Z), 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/DGA052474517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a708356bfbbb7ac52c8639ac35ae281367d603fd32335e82b3907dae1b329d8. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/DGA052474518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ab9ea6a95f1df3b2a193d40de68e8cef17cea0c69099e322bcdf5027327d3f4. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/DGA052474519.