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 0x91c5317181d5741ca20d8ecf031480b11a004f66883b4c8f5c6d7589c9418ff3. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/35ab36e6-934b-452e-911a-924d27b64393.json and https://artists.proofprofile.net/proofs/artist/35ab36e6-934b-452e-911a-924d27b64393.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 0x4ed739e1ca83a50b50080228b27edd5ca64021b98c1be2d315c2d004d0b55fb9. 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/ITHDG2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ed47860b6a3cc0838bf5bfa4a74f7041e2c950fde37a9f69dfd3a24221de7bd. 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/ITHDG2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2df0ab4e61f56181373e48c95f55db64d806c450f72f54d5f236553f76bb87b. 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/ITHDG2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4de310349da3fb0115e3209dee0ae67c1078491f36e3377afd102c042d70addd. 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/ITHDG2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc4be70815ee146e02357c01800af2a673ed843f5785880c69b06a7cff335f85. 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/ITHDG2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f96b2863a98cf103bfdcc45507e54f713bff8179cccae97ae1d1bd75c640265. 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/ITHDG2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d0ae8f70389479f661f96eb79270960fe6f484f8a469c737fd6e692d64d43a7. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/ITHDG2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfc5ab5ea1ea4b251fefa63c54fccd554a58906d82c4e74ef6dba78df80fa932. 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/ITHDG2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26cdd3b613c75560094ef98d5838356a4509444034dc97c1c56328de5f6c2074. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/ITHDG2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4525eff949d1deb21e90ae3a7f1b812f44bb7329b66a07230178f6917a6bc604. 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/ITHDG2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1afaeef8e16dc683f9f81b9eed2daaea45c6ed31e08d375c14fcc9c32c27f45e. 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/ITHDG2400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcca368603e7313027c9706f7d7fc6ee79d6507f536d1bc3564a48e9c668ecb0f. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/ITHDG2400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cc9808ea39174172c864412b33b5bb07ec0e8805244ce5a9cad2fd1062f89ed. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/ITHDG2400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbabf255016695b33d87edd0838ac3258f423f78070d3cd768c77de3c0ddff025. 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/QMEU31708008.