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 0x27e464ffa34781b2828e82a776b8e94f4e5ebbf8ad9934a024579e99b82bac74. 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/8fd92721-5262-42f9-a290-ed874dcfb1e6.json and https://artists.proofprofile.net/proofs/artist/8fd92721-5262-42f9-a290-ed874dcfb1e6.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 0x7949bab2d5f0389e353f0b41abb0eaae05c4a28b741529c75f226e86b12b2abd. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/UKZGC2300508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x242e7968ab85465161107483c9a5582c8e96a2241b441f8e8189562d7b0b306d. 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/UKZGC2302623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c19c13ece31f9a0f0ee6480520f939be5551580675eaea925253404bdc15f12. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NLT2H2300610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e36ce1170181b66e05951b1a09eb7a5e6f08f65f5dd798a8370ef43d5b2265b. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/NLT2H2300695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2917b4af8b652a7c47bf9ee51643f87783ab1ab7b41b0c49119a5c7ea0872bd4. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/NLT2H2300759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e7385641d5304d1b3956d4f99e5a1ab2f6d4ca8b26fb88b733503ec9ecedcf2. 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/NLT2H2300871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20b1bbb71546087c9310e9a72514aca6b05e9fba1e208e808de5a7a56b8dfa35. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/NLT2H2300929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa506c63475cb9651b766c67e33362fe761dd53bdbd6d71649a98faf75af72b16. 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/US3DF2446431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00027d62323f98d8649b3b62d0835ba43104072b0241b47ec81d0cfd859ee1b3. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FR8FB2327050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe7aae3a2ad9170283d98ec32ecb1a58b4d9bf149fa9bce53ee5d6a63c5092d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBLV62207433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc834cc1f6aac70a66cd139cec3e11320fedab5a26f00e1c9c14b2574a5535477. 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/NLT2H2301071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eec178854338a11a02ba7956baabdccdbd162bb17a00b129afac0122033a10c. 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/USANG2468748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x958468f55c126ecc1a67dc5bcb0dbd5b290dab02fa114146c474c9248780f378. 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/US3DF2420552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x826514113976a9907b8b9fbb3996cf7049a605435790ec3cbb1887b4dc424a8a. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/DEQ022384339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52a326ec70558a45a6953c93c6de81f74610e21655aaa007e278542e3b4b60dc. 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/DEQ022384341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2911979801e4b2d7b626e7a95f1be98d3ba9595fe28fcfdb99aed0b27066f1b2. 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/DEQ022384345.