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 0x5e2acab790f9869b838c47b55031e2daa0b475fa60ad3d8e9f8467e81ee71f8b. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/81da4347-96a7-4b5b-8ac0-e12c7a949437.json and https://artists.proofprofile.net/proofs/artist/81da4347-96a7-4b5b-8ac0-e12c7a949437.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 0xa0f659385d23771e2ca0debb1437af716948af6223a431ca56d135395f326448. 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/ARHA81500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73c7653ceb172eba1270f37f480884ff2e512e061fa5a7d52caff547daad7872. 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/ARHA81500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47a8030ae888bbf810fc5c330c30897938d938b832ce09030080992a3a1b976f. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/ARHA81500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8e449289d76b19daca2a19963ba67d500180f8116533d75a773d84bdf94cd4c. 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/ARHA81500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x423edab8e241576af821ebbc12f56d7810da52800880506cc968f2be080bc630. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/ARHA81500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75a13a58f252803e17ce87a9194d11d50a15e92594fbe73e05fd447a26159aa2. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/ARHA81500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58881556a0a17314603cb7850b654537ceeafba9aa75c254f54d9344bb81afef. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/ARHA81500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7c37950d4e9824cea6379cd2f08c5bf5c67ec40b30c27295a32321625908304. 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/ARHA81500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b7928376322eebe416e4bd45f060ab85ddec9d54453f8b2fc6e9c1b2eb45404. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/ARHA81500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0fcd8d467c6ff5491a55cfae363e729c35232c2626b5f87cfafc01ef606da45. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ARHA81500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a726a52312f9ceb9bc36cf14033e07408eb8c29890524d3a1fecf2a34801eb7. 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/ARHA80500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a6bbec6724c67ba466ab96dfb9cb246d70703438f4c4463e9e8994ae20ed56. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/ARHA80500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b7c24b2ffd458c9b5f26d9b38cacc2bdecf9ec9d317242d5e31078ca166d7f5. 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/ARHA80500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a667eb7a1f140b51e0fb1fe01ed6f1c448d9e79d7864a5c451fe42fa2da5d33. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ARHA80500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1909f8b473af4903c73e47224e1dd88f9ca85f0b648133e8cf3d21c5f18bd3f. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/ARHA80500007.