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 0x582100a907ca3752e74b3e5c09b4ff5d1ebe5eb109182a9940217174ca49de9b. Chain 2 (Bitcoin): anchored in block 953588 (2026-06-14T04:52:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/002ed0f8-4aa1-446a-b986-9c8f61c36e22.json and https://artists.proofprofile.net/proofs/artist/002ed0f8-4aa1-446a-b986-9c8f61c36e22.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 0x7b9e5620935c26211da7a01a08805397036c3907748fb0425bd604adeac4ec82. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZW9K2342569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x054a35b8a33fc0cb1aa5f462f7eaa64331732cae7cb74e7ca2ab0442ebb49467. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZGLS2350510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b47ee463813b939381b5a52fd9714cbc97cda52d86c504bc7f6e70cc756b594. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/UKXN21959239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x849b70acf6441ba7924b3d84bbc30ff3852338edc5f7d7cbae2213619b9ae016. 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/QZW9K2342567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7108f77df4458f57a1800f9b3100193a3da05f5220c710795a008f2e146196b8. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QM4TX2220110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b2ed798be1ec26fbf1c3884a11c68d98e6215c12ccf153f517263dee47e3df5. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/QZNJV2319933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09d129d960eab0ef41d0c02e0276fc82e4631d87a1487b565a4569bb22865ec1. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/QZMZ92164865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68c8d37258070a4937803b8f72e84abb86bcaf0c29932fafb2978a546bb2cc9e. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZW9K2342568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8acdbacc3de01fcaa84096104609cf317f8cbe138d410036557dba327441c34. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZNJX2322549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31598ee640bff70dafd5c91f3e36069c6e6101f14dfa3bca7b18108ebc42c05a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZNJX2149630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44e59bbdb8139ec52652a5cccc1562568652ec52970d8c60b77e4b71ac24421f. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/QM6N22289299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e788441c942e661cf1477f10c283ed9b6f288431f7b9c492b0cea287e012e7f. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QZ5AB2118667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb201de2db210fa288acd69c98d155f9ca3688fb61708ee8707ff3e8f3737503b. 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/GBLFP2101443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ec6e7742c5cf1b6d48dd280cf9403a3958b4eebe7248f5268efe94a29d46b19. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZHZ32199003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6324e9cc8bf130cdfc09353463b6540679e5715239bb89335847adcb02080dea. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/QM4TW2259550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbecb7ea7892415bce2d9bfc03f33e163b21e92503d1ebe53c5302ec31f3e7ab5. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QMDA62201032.