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 0xfb383194dacc62709ecf404b1ab8da9d709362874932008f8c18644d4ba186a7. 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/f43735d9-0e03-40e7-8628-eced42bd4915.json and https://artists.proofprofile.net/proofs/artist/f43735d9-0e03-40e7-8628-eced42bd4915.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 0x8ebf1338b630ce6f294d47a68340f22822ed3c2b9ccaf23d2bc64d0fb8111926. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/ITXQ91800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3b40ed0e02c60bcdc866201fca62e3ddc3dec32e9e0c6f80ab449293aac0ead. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/ITB552216706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x989c6a095c8782612a06a34f7c533209a0fca2c86866ccfd34c3a6ca79d4d2a3. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/ITXQ91800015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x989c6a095c8782612a06a34f7c533209a0fca2c86866ccfd34c3a6ca79d4d2a3. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/ITXQ91800015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ceddd705208b29bffb41ae703c6f5cd052315f051006ebc2d54243ea49d2391. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/ITXQ91800019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ad9cabb78503478765dcc7e6bb7cf253d0889feb673a6bf8019e28400192789. Chain 2 (Bitcoin): anchored in block 958368 (2026-07-17T05:03:25Z), 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/ITXQ91800020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x090b15cbc6b9222d47477b9ccc7a3c84d5752b16b6d2ee69bd0d21ba9fb2fa2c. 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/ITXQ91800023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89d88bfd965b8bf7f8ed8f49ff227671288a48bb2b4404e2bda1bd2886bbb06e. 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/ITXQ91800025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ae274023cbfa88ceba66951f3f04f79d4e27e0f3ae381d0ea13428a133fcadd. 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/ITXQ91800024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc231587dba396ea0641558b5e2cd7659a263e719fed444938a0b5a83436ac420. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/ITXQ91800027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3fd51304ad2765c1d5353e079e3e9244a53e9de9672d2a9767fb00e77823b42. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/ITXQ91800028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e7a24d90d02dc8fbc1868e00e5fdbf193c11c1b4662fbde3ddf223918bffefa. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/ITXQ91800029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a7a0b8526481cb41906af11530dded107bf336eb2bce216b8d7099f92583b6c. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/ITXQ91800032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf2826278086074ee30d2f6e47de8819c2a626f1fb549d58d2046d04579388f6. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/ITXQ91800033.