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 0x80040f4586edc758782a6db86ef4309297e49993f3866feb00ea3a2790a7421a. 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/da6c9078-6d2f-4c03-9fa0-0b08b256069a.json and https://artists.proofprofile.net/proofs/artist/da6c9078-6d2f-4c03-9fa0-0b08b256069a.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 0x1df76f510bd00c7104bfdfb8d1062d587ae62293e07d29bb6616a075c5dc1e56. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ITH641032928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa89f0519dcab192183070bae6221078fd57e8bec7fc06ddefbd9f5fc4bcbdd2a. 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/ITH641032937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e79ba5971e1121f7fd546d7d0416bbc3c75c37d2bf631b12bb9cf3f7ade6754. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/ITH641026040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x077c278d5c266e1aca4f395c2a2289996b092e989f3bb9e281fcea337e63a058. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/ITH641026042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x908f72ad059f44a229da9e4c47087ec1a28a4368c6761209941ce0a4e94a9b21. 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/ITH641032948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ce7d2f789b115bceae94b0b08d001bfa5ea504cbb58cda28075a3ea29e575c3. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/ITH641038077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x129b14a24dd56576ab9c0dcbc28276c60f00d80acb876c4f53330a9e3d9ec4d9. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/ITH641038078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08bd9f366407298b87b330ddcb47d24f069f3814f8f9c31b0d752cc1cf5897a8. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/ITH641065465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9121b90a9f1e8d3c76f92dc26821d6eb55b80e3a99f766930032ce5a2c803b0b. 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/ITH642023165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdfa3a7e86192ccc22f0ffb4df0d69beb658e4ed09b20edf0b997fd3d9f9b36f. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/FR1A92302283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedc021babc33aaaf0a9c8457f4205b70e5a11da1698c934483964e7b08bd3454. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/UKXN22598188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c17300ea169a10410c1955f2a0904ec8148c84aff6a7ab33659d549694c5038. 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/UKXN22598187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7738c22ac2e042cf89e2781168e701bf821288578b8a89adac1814083c3fb301. 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/GBMA22569527.