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 0xb3fb5709fae48fce8b977e08d76ce20931d723437609a64da251a55cf0477ccf. 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/7df8b43d-a95d-4d8a-b4c6-832a01ff2a17.json and https://artists.proofprofile.net/proofs/artist/7df8b43d-a95d-4d8a-b4c6-832a01ff2a17.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 0xe13cbb27ceb3cbeff37c560495c3a466b95d2b1fe14cb7394b7bd97083076905. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/FR7U62100319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x458ae2537975f9cd8be72b54bed1dce8d3f87799407fde5df73f143efe35385d. 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/FR7U62100325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5162143e8a17f353841287f747b0a15cc83d683b27990f6a997fde24d5397eb4. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/FR7U62100321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c7b8c78bcc1ab6d2cc327b31ff8347a8d8f4eade2a3172b39371f7eef9d76f1. 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/FR7U62200453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91f7ee7cd306ee7ad9a15174ec942a2d59113eb7e39a8584845240881af1e097. 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/FR7U62300537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e6ef2b1fdb5de872a4321f0502017f6843ef1181cc3d3e0bde8074dca9c9fb0. 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/FR7U62300515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb201c3d14aa83223a6e694a020714259e05ccd9711274eb845ff95711287d141. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T23:11:42Z), 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/FR7U62300517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x470fdf0ffc765c5c2b213fed71bd8b987fd36b4c9e192dbd14ba54b968471790. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/FR7U62300519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01e476db1274ebb8d7e8218ecfb02ecdb0545609f3f7f195959c92d7927dd323. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/FR7U62300521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8da7952498eecc3aedc889dbedad10234799aa5485fd826202683cc48ba481e2. 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/FR7U62300523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e06cd670b0270e590d198e38a99f2991070683231485c217d0768e73a5b2b98. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/FR7U62300539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x347656eaade98499c99d5053f708427ba1a7dbe70efcb9d62ab1cb8b48f99f59. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/FR7U62300527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dc6cb18c45cdbbf19840a88f42279641ab3ac6dfebe9ff955a13a33b692461a. 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/FR7U62300529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99c49cfd03b36ee331f68e11dcb7055c0ff9520ef4f35e445efbed9706862d79. 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/FR7U62300589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d14fc6fb8da1ad95691ab1733d63a4570817792ea60dea8374b72a5da382fb9. 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/FR8FB2135110.