thumb|right|An example of a payslip from the John Lewis Partnership, showing gross salary, tax and National Insurance paid and yearly bonus entitlement, among other things A paycheck, paycheque, or pa
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 0xc74c7601c9c8b17dde5ffc2a3bad4510e2c7988f872fd9fa9686ac039deccd56. 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/5a685d36-9c48-4b0e-9928-11db36d7a254.json and https://artists.proofprofile.net/proofs/artist/5a685d36-9c48-4b0e-9928-11db36d7a254.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 0x3a8ca484657228fd0b161bc59db0337a45b00a17dd1b781a2e3f47bd513f450d. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZDA41852073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b3c3531340353ca0230484a6d7d618a137a7a61fa3a1d894e22b70dc82f44e0. Chain 2 (Bitcoin): anchored in block 958124 (2026-07-15T11:02:12Z), 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/QZAPG1745805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8caed15febe2ddccb6e40d48406b50e5b0b1385c650ae2b55d7fb3c5ae23d73e. 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/QZBRF1801882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x424e5190f8b0cfaf0348ef1bc1f8cb3c6e68c90126499727cdfa9176434b08e4. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/CA5KR2300810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03086404a72f84fc2f7b89c26c2f8f90b9651750073bdde0a219601927643f2d. Chain 2 (Bitcoin): anchored in block 957884 (2026-07-13T16:55:06Z), 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/QZFZ32141645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62e4506649b76068a093e9ad7c25ea42c41c4e9fa60a0956839e6430edc29401. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USLD91735059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x420d36e6a849079680e35f78350d92052a5ff3c8d26c6be69a80bb6b7d777d00. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USLD91735526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa95efd6bcd5752a620b182cc3351ece3bde2af24f51904a636d0a8b342fb0759. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/GBKPL1969774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf07ea4b2b22656542bb777433a77b7a2f0f89d6ddcb3a21f8507835c8ac87e42. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZES81902530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3cd1dec15c8e1d177e7ec9e84969f1de6960f5f61355b4c264302cfe5f91bca. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USLD91736250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb16629597e506b1ec91d47e73effe54d2eac67e0072a9ddccf94e159dc701d25. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/TLREW2232842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb46e14f739bfd6bf6dc4a81521aa81e8710d756893869c664070a729bb5dd2c8. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T14:07:58Z), 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/QZVEM2311095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab67aa28993e3f8533e35981bbc5b7b0e8053b5c36b6e668bc104a61ac4347ab. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZVEM2308464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb302e8223c872795ef1ad15fb5e98343d69d1ad171404e32d664977414863174. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZVEM2311097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb16629597e506b1ec91d47e73effe54d2eac67e0072a9ddccf94e159dc701d25. Chain 2 (Bitcoin): anchored in block 957866 (2026-07-13T14:54:25Z), 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/TLREW2232842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5d7d2f9d90b9f1d359a19000ccf1dd994dfcb1b26797dbfcc6c055cbdba3fba. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZVEM2311100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab67aa28993e3f8533e35981bbc5b7b0e8053b5c36b6e668bc104a61ac4347ab. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T05:05:30Z), 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/QZVEM2308464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb16629597e506b1ec91d47e73effe54d2eac67e0072a9ddccf94e159dc701d25. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/TLREW2232842.