Chester is a cathedral city in Cheshire, England, on the River Dee, close to the England–Wales border. It had a built-up area population of 92,760 in 2021, it is the most populous settlement in the bo
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 0xc5800ee648c9abaaca774ddeae3ef625c30f347c8b4155d22bc3176650628ceb. Chain 2 (Bitcoin): anchored in block 954035 (2026-06-17T02:39:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3c5b31fd-0a1c-4bbc-83f5-f11113279633.json and https://artists.proofprofile.net/proofs/artist/3c5b31fd-0a1c-4bbc-83f5-f11113279633.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 0x6ac5b80ce6717329edbb7d3ec4ae550b54e666a2cd237e5e14a76bf0a887875f. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZK6J2488332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc73a6278b5f2273cb919c8f3118d25f78ecef834e039da08687b84062b590d4d. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/QZTBB2468102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x405fb0bce99d8625740ccd1694656b5eb22c7e5ab3ce670d8fedf7253801e03c. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZZ7U2422122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9b3b65ea537c8984b827027a1d516c1e2c5387f9276a81a488bde67a637f434. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZZ7U2422123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24ca85b30c249925b4cd6142c5a1158c6fa980c96e2c53ed6e0e490e2e0a7c13. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZNWS2540702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52fabb72c2d3da8453f9634ac24c49e72c33f0915a3413f066b0d19e2e1ceb4c. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZNWS2540703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc569233fad29cdd8ab741f53304b2d6bc8c43a518506d5957a06ff55d86930e. 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/QZNWS2540704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6acf71d60869ea315a0d4de9b8e9266735d9334f28ed7c4c39856db752a949e. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZNWQ2508894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86f49fd7364a122b26e9f23c40fcbda89e0540ce08b36d585349912d7be75083. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZNWS2540706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xada786fbb048df5cd6575ae7a148f9190306a314e84444d0ee5957b5bd93bb07. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/QZNWS2540707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdda9e0586c708fb98e531d72cf5ab02de8448bb1ecffa08fc3f37a08c4552fb0. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZNWS2540708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ef18090338e351b0536c81341a5b10d6aa72068164893a51186557c2b3f59d. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZNWS2540709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99f97786e771a0ce7be73df104b01ed728665bac542fc6ba146d680b069cb1d3. 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/QZNWS2540710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8753f5de281581fd564892d9a6ea4c55325ee36701ab0923524f42115643b653. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZTB82599270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebcfca18ab945bc1b0d93756425dbe41c4017c38576d128101aa5cb2e9290d59. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZTB82599271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aaa130fcc22556000681c137e03d4d7eb2443555e1f261281a72aac9372423e. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZTB82599272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03484f5b79c094d7f6359afbacc70ae40be42c0d07c999051da7c85b4f48c3fb. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZTB82599275.