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 0xdeac29e90ad07beb896b00eb3d11030446dee7a904353e083a4cce67ec334037. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/54031434-1070-4155-b160-c6fbc671d600.json and https://artists.proofprofile.net/proofs/artist/54031434-1070-4155-b160-c6fbc671d600.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 0xca50460466867daa89c154de83d71edcf851ac878f3acbbb9a298f7324151aab. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/GBB4T1900015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x269ce26366d7ec9b9657c3dd39ed3731e7d7a9df0c27e05db1861ac038b5bd03. 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/USZXT2455191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e5efdd7f14c2bcb276ec05a8c93c7b946b334b8411db2413a14a731dcba1970. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/USZXT2455344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7d430cf8954d1bea478ba786f02cf9207c35892cfe973e4b33c569a43de98a0. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/USZXT2455343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7d430cf8954d1bea478ba786f02cf9207c35892cfe973e4b33c569a43de98a0. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/USZXT2455343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e5efdd7f14c2bcb276ec05a8c93c7b946b334b8411db2413a14a731dcba1970. 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/USZXT2455344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f918c87f23dd3cdf6bcdd32f9a40e5ae74e957e0449c10d7184cf56b613da81. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USZXT2454660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dc75de1fc6d9b5bf533d0e42d367561e0352cb87fe235eaa77fa47828c022d8. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/USZXT2455328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffb747808bb95bf0b88b86e86b61ef7c610e51e35d413df540740d27521acc10. Chain 2 (Bitcoin): anchored in block 957957 (2026-07-14T05:10:34Z), 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/USZXT2455345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x269ce26366d7ec9b9657c3dd39ed3731e7d7a9df0c27e05db1861ac038b5bd03. 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/USZXT2455191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0e36da31b856ff43eec5dddd7e1d86d2cbec0e0b4ab95622fda2e0524b67a16. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/USZXT2455346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe003adcb1e1e19c17e97f42ff2053a6fa1a14b794a5a9d0aa25bda40924c7d9. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/USZXT2455347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1811c9182303990bcbe8b9acc4b4e8605d7415b8942bc582d57ebeec3362eed. 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/USZXT2455348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x798c32483d9e3493eddb52711bfe95718b524ff2f6544cdcc144bfd6c022e5b1. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USZXT2455349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea219463493d117cab4bdc74eaad0e3ff488e490be40d155700059ec01de42c. 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/USZXT2455350.