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 0x97cc9629430c56913d8a6684806c0e7174ef911f9837ce6281ca12e88f01750f. 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/140ad899-b0e9-44f2-9bcc-b2e3a79a1118.json and https://artists.proofprofile.net/proofs/artist/140ad899-b0e9-44f2-9bcc-b2e3a79a1118.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 0xa4387470b4cbd5967eea1a5f7c07eb92404c49e2f9f55de2bd876cda1247921f. 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/US3DF2089036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d2b088a34d7dd4bc7c3a1d732fe7088345fb066b37a0ad374c9ed970a7b3f97. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T16:39:30Z), 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/ARG102420623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8737ac77f3caced7c23c74f036219de521c8025b16b8436ad5e96ff7b60801a. 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/ARG102420640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9013e980ac278da9eda1ae7527c21dbeb58ef7912e2fcb355d1ad76fc6523c73. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/ARG102420643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef40e6a28310f09bc78e76cf5f0ecdba727838024a10c0c92c7f7bb29410f1fc. 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/ARG102420646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8570e12cd0cfd3c7bf18f1e293f302b6a12c2a147bb26f027df3b19850e67704. Chain 2 (Bitcoin): anchored in block 957650 (2026-07-12T04:18:57Z), 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/AR5UH2401089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bc26999a270e12a319257e1253b9f9648130aa5b2e5ce23a6fbb6b9620b12dd. Chain 2 (Bitcoin): anchored in block 957650 (2026-07-12T04:18:57Z), 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/AR5UH2401090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe70ec18da4f2c856cb75909eb9946097cfa343dc8fb74cbd20b8411cbe1991b8. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T23:51:53Z), 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/AR5UH2401091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d0204e5441b6d9b4f2e3a9a6028e134c1baac0477db51d1b79fd091ed1992fe. Chain 2 (Bitcoin): anchored in block 957650 (2026-07-12T04:18:57Z), 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/AR5UH2401092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x661f6427198ce77e94d0a488aedb6b4453ef44a65791ac09149fc4d2c8e08fbf. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T23:29:36Z), 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/AR5UH2401094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7d99a98ffc7aa386b51861a452c0ffb5e7e5395816480f19d16d7db2beb42de. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T16:57:23Z), 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/AR5UH2401096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4e850a6f025cc303f4fc081d456f337f554a6ca002c8a772395c73ca1554f79. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/AR5UH2401097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x225ac1d76fb88e2c896bae7451e76ce383a9d47d2fdddc96185e8632ca442e4f. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/ARG102521094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf67b06c0caba8a97179c536eef9dd9582b32b714595cddc46d686bd10931375. 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/USANG2450713.