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 0x4a275e08dc0d1f8759451df5161b840448bc9ba9d6c2565adb7b2728036b43f8. 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/55830bb7-e755-4e4c-af6d-87f7a65437e4.json and https://artists.proofprofile.net/proofs/artist/55830bb7-e755-4e4c-af6d-87f7a65437e4.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 0x40cd740ad84f7880b0140a0318519b1e4b831e057a3217ceedd94799c64fe378. Chain 2 (Bitcoin): anchored in block 957554 (2026-07-11T10:39:45Z), 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/USR2M8900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0816a93c2d7ccbf0160b58be692e0731eddc1bd2c9fa6e6edbaba10ab601bb4. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/USR2M8900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad093d1ffcbbb48ceb1476db7048a478c22f56fd9a4ac87b707487c01888b63a. 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/USR2M8900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797d07fdf94d9acaa20cd5fdb3dfc725a3e1c3ea800721ec2dc01e4f228fa8b5. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/USR2M8900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5dc26cbb6ef1de36a2f63b5b6bc413b702037e4ecc6c92b63feb76d7c14282d. 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/USR2M8900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x796fe2ba48ec8d3e14a1735aaeb5652d5afc6d246d78713905689e1407c340e0. Chain 2 (Bitcoin): anchored in block 957552 (2026-07-11T10:04:42Z), 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/USR2M9100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b89872bb110fad860b0bac35b60888ea9a4b5e081795ad96bc0de14dd124e9. 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/USR2M9100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x517bcf13664e6a6a73f9aa284fcabd6aae50516660b4ab0c949d014f49003f10. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/USR2M9700031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x051ea00bff94570e8e88a3d1663a77f08c10ddfa47f3c91e7b736431ead6a5b9. 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/USR2M9700034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95b9afd901f138653d77afe9dd70cbbaacd8c722aaff8836acd836a6e45cc502. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DGA052308339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x517bcf13664e6a6a73f9aa284fcabd6aae50516660b4ab0c949d014f49003f10. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USR2M9700031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64309fd92deb7c69a2f7e40c7521fe30cb28f4dbe98ddf1d544a697fd0e8d3c8. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/USR2M9700039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18a034e6be401f40fe1126eae5624a5909b14fc5c0d2b8b4355a85fbfca9029a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USR2M8800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x649dfd5020ecb9b79b7129c443725d27035c651e39edb2a6931089b3e0cb61ca. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/USR2M9700032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfeea314f7aedf15df7347d327ad6f0fe7e068d0db1256d5136aa3fc3e6d7192. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/USR2M8800013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa52a704c4c43b554871e8c64f6dea47e563c347a48f79efcef96528296d7b530. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USR2M8800014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf83bf5a3b7f06ecd05c9c9798e31206c25599061ff688f0d29ed2c04c2b3c641. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USR2M9300035.