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 0x452918b6db8afb3ce09668cecb718a579c4846c30d044496dfa5fbd8a23c6315. 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/72c57887-f2ab-40d8-9c3b-5ab1248f0e15.json and https://artists.proofprofile.net/proofs/artist/72c57887-f2ab-40d8-9c3b-5ab1248f0e15.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 0x175b77720e54ea64b908379a0aee389890723d143c28846214dcb61294fe6863. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCADZ1895283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b4761502cfd5fb34c477d8696f38cd71f789e1d299e3cbeaca2c76119dc040. 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/TCADZ1895295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7da875e04ee52a63676e0ad96b64ed99fe071d66848db3df5d5416e73d6c721c. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/TCADZ1895297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x783ddb9a4a2f926d0e9b2cc41e3ed596c24e034dcfca34e4ac054387c9fbfa55. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/TCADZ1895299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9332daa8a51fa36d86ec7574b5462a9f45407eebd3399feb9ce5c6516bd9b777. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/TCADZ1895614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x725ef7c75f554fa70d2def2c12fe2dd2dd16b34010f053b8538ba7517c4019a9. 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/TCADZ1895318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x345a73ec4d322179ce32728b0018c1577ea1ee2269f1cc7b4f025a07b2abbbae. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/TCADZ1895558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe37a150ceb075fee016936fe6e30e169ccf63abba78342dfdbfdbd8fd671b619. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/TCAES2009308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4558408514faff57bf79e5e1f629538a33160af51cb779f9d8755e9a9e4cc46. 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/TCAFG2002283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00ba051f70afa0694bb58718ab10fbad237ab1be5b6584a417eb7a541adc2871. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TCAFL2193543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeaea17187d9c019ff3df34201661cefc79bb6788ccd419381720d37a5f6104a. 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/TCAFT2104925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec738699499750ba055c62346130beb6033bca6fe6015dcf3b8bf69e29f81395. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/TCAGU2334161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d421791cefb6450b3a3026a3edba918c27e043f8a8cc324afb73c9f1d5d566d. 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/NL8RL2328326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc69fd0584064f4b6956f23d8e52c6d621201a00831de962a133563086dba59cc. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCAHN2390991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf95b2726ab0e7daac5b1fd8dfd047ace8042e9742f2d4c82756441b88833133. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/DGA062466478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35faf439411effd82e046492f0a4ace555547956c108bda8d2fbe096dae1923d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DGA062466479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72015243225c2756ab16a39f1ed3f26e54beeba455584ae19722adb3cfd48e5b. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/DGA062466480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c509e08e9085a3ed2cecd06bb270657e6d1a1a0bfa357d83516f8b3d939ac60. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/DGA062466482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa34a871eaf12c408c4ec32b43ac184b8be3e2eda001bfbe8da21ec8ee1aa22aa. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/DGA062466483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dc4ce83ad4eba0b3303c5871ea20a0a4b46caac0effd2a789790da81355a882. 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/FRPI81803620.