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 0x4dd4fcbb3a5e42cce901473f3c51277f9e882161b2a5fbde0187cd1880b02663. 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/fd68e8c3-e2a2-485d-bfd5-f9c797047b1d.json and https://artists.proofprofile.net/proofs/artist/fd68e8c3-e2a2-485d-bfd5-f9c797047b1d.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 0x9c92bbfb4110a6eb560bfb1df5735be9655725c3b3b691687a20eda387147a2b. Chain 2 (Bitcoin): anchored in block 957772 (2026-07-12T23:31:17Z), 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/BREED2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7d3482649eec565b822b722e924b10c63688ce7bf2db828f945948d9877f33e. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/BREED2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8acedae0d80de0349133b810549e8d8c203f2b1e10efec07a74e36c0c951e50. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/BREED2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fa51cbf45084f016e9b457bcf731a2670080669dd45ffe92c88111ff2136eba. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/BREED2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x243b5d0740ca64d51b8de4bee51b1166a5f6efde56f543936700c8144f7efb79. 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/BREED2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11ba6650982bab37ba9c7e361f94dd5532208507c8696fbfa1c6e1108e4bec6d. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/BREED2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf8780421490545a4a8cac4e0c24a4db31a3648e9fd5821ba1535d4aebf29d9e. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/BREED2300019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1bc2fb6ecc77f6a26baac26c3a68f1249130d6a2e17405f3449e1c7d7fc1c21. Chain 2 (Bitcoin): anchored in block 958378 (2026-07-17T06:45:39Z), 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/BREED2300020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8f0ef9836346cb234583f22f31fb6071831b1b622981292242f0422430bd789. 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/BREED2300027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2b85c9bfa041b939bd220397ea96380fe7c4c3b30530987deceb887e6e98f7b. 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/BREED2300039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd415e175a778c038c499cb4bc4153666bf4c90e3f055e406aca30618eb1e6eda. Chain 2 (Bitcoin): anchored in block 958573 (2026-07-18T15:49:54Z), 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/BREED2300042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54747f314a9f222e2b597e0cf48dc9fc759f342b120515b7b0189b1665df5572. 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/BR1CR1300030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18472aab30b33c518f27ee5d4ce295eb644d1764f872f06e7b87866c51adf638. 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/BR1CR1300038.