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 0x2ab05906ed225e48b07d08549a2b242d3eb5f211e360ff836f86116543145e42. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6aa4c905-89df-49cf-9932-521410907478.json and https://artists.proofprofile.net/proofs/artist/6aa4c905-89df-49cf-9932-521410907478.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 0x77dcb0d4be63e37bdecc6f3212a9f5ee66f935504a350a1fa30daecaccc9f27f. 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/TCADZ1884765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b121e7c051e6c4784038e40d331f89e3bf4ce40cb70722efc03e255abdd95fa. 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/TCADZ1884768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72dc8424763f3ca74144fa004366fe6a89548c7a7b088ffea8c36b6392d029ae. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/TCADZ1884771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5961c1397b3c1d99e3534884c9782667727185b9088fe5a11596db983816265. 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/TCADZ1884774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea95d703eaaa8cdb7b5750b74f37092b5f3fffb9acfbbecec27e5c502fc9f02. 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/TCADZ1884776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecc26486f42a603ea99a2708a876aeaa17506071af88b97aa1a3740b95f9a364. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/TCADZ1884779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d654a8054ad866b8d8c42ed414720e845cfa1241f0bdaafb459fc241b551397. 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/TCADZ1884781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfab17c5ff6ce9e4eed9fd54510ba7d0674cfcce6af46a4d2aa8b1cb777aecc66. 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/TCADZ1884782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48510aef064e4e375c217c7bbb4ddfaa12264609103e138500838dea6ae65ac1. 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/TCADZ1884783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe46f2dc024f5e80d230522165223d71c16d4e60403ffb45459516fd5aefcdede. 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/TCADZ1884784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfd51c831ae2f75085d4f276c6e57f460eb530ca56d7c888618271473af1cdf8. 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/TCADZ1884786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79a2528476c50cba9c4f2fb8ccdda3d84e49331ea89f8d22e68a98cd43cf5b5e. 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/TCADZ1884787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef462f35cfa2137c0dacdb6f26142bce7da1d1c62dac2e19fea055d11c078eca. 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/TCADZ1884789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb90b1a5d2af3479102140757b628a6da20f6ce1b14970cad1cbc0dc1e288ea09. 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/TCADZ1884792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45d4a33785a4a7cbe2db64257811bf10251866468eeda66ce260c40a51f21768. 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/TCADZ1884794.