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 0x56e12139f026e77a090772cbe832b9579bb96fc4761202f3bb5ceb2e025de584. 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/6b97e3ca-c624-42f9-a45c-0d0e5f377162.json and https://artists.proofprofile.net/proofs/artist/6b97e3ca-c624-42f9-a45c-0d0e5f377162.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 0x3506d9e6100cff2225353f74a30bc33e279c38b4179c4a14a4e12627c46d420e. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T18:58:32Z), 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/NLX9G2000038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6017711769809dfb02879db0fe041f50753e25edac0e3983ec05493de65dfd1. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T11:04:54Z), 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/GBKQU2118684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72e1ed3646f2fc37cc1a6901588bbc9efd3c9c46be7b8a7d3a6d909eff2fcaed. 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/BCD4N2100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc7145156d90c7f7c8740a7606176f2ff00cea380ef4d64adf578bc5c03ad360. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/NLX9G2100092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf054b5355acd4c9bc87b4ee4bafa1e29850ab50ffbd3be7e8c2c79e01db97724. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/US3DF2257013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ef69ca1cbadcd76349be4aaa354ea1a3ffb9673ef24702ecc2205d8088f6999. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T16:27:58Z), 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/US3DF2257014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdca1f920fc24f2b239a9b1c36dd0a98be8031bc68fe531f5ed3e65c1616e01ac. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/USANG2211763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdca1f920fc24f2b239a9b1c36dd0a98be8031bc68fe531f5ed3e65c1616e01ac. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:36:37Z), 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/USANG2211763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x040185567f480aac0aa89ec1282d2f6228d3e55944972428fd880d04359524b8. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/UKZGC2411146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e9171767233ebe1d94bde02889c7f6089391bb7bd2ae2fa83827f45c5fe7c10. 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/NL4YD2100065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6e30379c3fa2a304ef363878f1923a61f5a636319ae7f22b18f6e90067f07ac. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBLV62127949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72e1ed3646f2fc37cc1a6901588bbc9efd3c9c46be7b8a7d3a6d909eff2fcaed. 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/BCD4N2100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa991839a525808f63a63fbaeed99424dcaa388da779441d44711a3228683c346. 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/BXCMR2000022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x040185567f480aac0aa89ec1282d2f6228d3e55944972428fd880d04359524b8. 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/UKZGC2411146.