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 0x5a68fd9231f781b3d79e497a2515deea4bdd5315165b97ee404bedaadaf6ba0a. 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/6c41c792-63c5-4f74-908b-670917b37784.json and https://artists.proofprofile.net/proofs/artist/6c41c792-63c5-4f74-908b-670917b37784.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 0xc308eb4c894c82eb0bd857f20d392ab9bb97f2b88575b33da2695a5b2b757f78. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/TCAGI2206979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99368495ea2703d88489368304c2a5571b3fc4e7cb63ebee9f0e98b26aaeb9da. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/TCAGI2206990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc399753bdc14c79edcb7d7354b4af6cb085cca236f06ca6b171d0a4639b5a077. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/TCAGI2207004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f1ac07bca8a0cde8ca2b084128260ecfaa0e6b2c3f104a74de124bacedb42ed. 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/TCAGI2206812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6043a593c14000ce83d5690a9b266f8f45671529e32aae49c7abd0db0edc9eba. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), 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/TCAGI2206891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f280276df8bcc6a45061077ce7360760d8b17995b38aa2d1332c556b719377. Chain 2 (Bitcoin): anchored in block 958116 (2026-07-15T07:27:32Z), 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/TCAGI2206896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaff9884f7926ca2303690b9dd57ae7a03f39997eaea8acf08004897526f23ee7. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/TCAGI2207036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cebbe815d0d5964ac33a21fc8e1785d16f925eb81744057594c0e333ed3fda5. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/TCAGI2207055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d82a41e1748a4d68aa042b1bb311b657c1e0e3790417f9450cc74c9e72e8834. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/GX5MY2247360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aea6d5160c753a5dbc6dfe008047159f2bad82f3b75379b9279c09ff4d8da93. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/GX5MY2263652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a3389cdc47025446c25520adff96c31f8848c2e7f9f1d6d280f0bf23586153. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/GX5MY2263654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc89c7feb53d577c1d9c8f140a251a71d1210f04c9d51c13e0d8666ad268fa8dd. 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/GX5MY2263656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b6ead3e72fd6e6173e1c4d356d14ed58c95fa5fb823e522980879abe7df3e94. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/GX5MY2263556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d91c78f026356c663a05548559913a47a2717e769b6d2fccfd248c9c5043dd. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/GX5MY2263566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3263462f58bc49029a990e4e07b3fa91ed3780ac8ac273d09cf3904d0a23800. Chain 2 (Bitcoin): anchored in block 958491 (2026-07-18T04:29:42Z), 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/GX5MY2263662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x345349e6bff016bdc87e87298a522d082bbd49af3e8458ffe2b9d4f0e263cefa. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/GX5MY2263663.