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 0xfe4e41c7cb64554a3c885642cdf23339be597343960c5ea6e58b89e541ab0c3c. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5e6cbe23-e6bc-40dd-81ac-85c546f81863.json and https://artists.proofprofile.net/proofs/artist/5e6cbe23-e6bc-40dd-81ac-85c546f81863.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 0x0e02387557b5a4fcd1382b2605ee7f8364e6d039185e6268737e90413621f703. 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/QZHN72419870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b4e52ca695e900ea66d0585fd2fdd8eb28eab4c2144e07c663da9dd7c248a0. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZES82336990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd29640eb24c4ece4653500d41beabf43dad2359168b6d271b4c35844ee8811ca. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZMEM2259887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbf4297a2f7a27ca6415ffc274e380334061c91bb776a6888f1a5a2334a3a0cb. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QZDA52236482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8b0920f292a0a68afcf02da284f1d0df65f69ed6896779a09f25682456b31bb. 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/QZMEN2116341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x077e3673ae4c8934701ef0bb163ad7c484f4b09e024542236654e8607b58ffe8. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/QZK6N2158502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10fc5691327b450b88c09b41d679dc73472c442d576bd2d88b0e72741a795c62. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZHN32130490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa84f890494248a10c5eb4260e6e39644e92c881ad54ea59428365677b6e91602. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZHN32131144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x278bc2804907c0de7991b656d83a03664eeecb303ecf542dd1334e1901229742. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZHN32129303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b5fda1eceaa525cc198915b2b22e188227a3a7de21abeb1fc455196aff8b6d. 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/QZHN32128840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb255b36f4dac47791fc50d302e01f2aaeeb5c0ce6ad90b351ecd3f262562a127. 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/QZHN72182227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dadbdbdaaa2886def8567665463f62bfd43aac18e5eb320b312eef1eed8559c. 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/QZES92121935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b9592b62e79a86a33ca9a460afae102c00da625326cb27cce8290e5b2b37fa5. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZFZ72181775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5973de232a9eab73f7ed7c6fa8a82187ad6a2142d1a03de73ae5a36d07cf8e8. 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/QZDA62149486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb3e6143207a4c3d82cd2ce353a266228be4dd028204cf60ef024c2bec100ad9. 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/QZK6Q2029396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94ef3e86202bd6632c10c950715b64be9ae8aad541ae7a8e4747aefef4fe9ca6. 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/QZK6Q2029397.