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 0x81c55e8feca1d625d27b16e128e32bebe436d97b2a808fdddd0a1e2d292f1bfc. 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/6f7659f3-39d7-426e-861c-601b7014902e.json and https://artists.proofprofile.net/proofs/artist/6f7659f3-39d7-426e-861c-601b7014902e.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 0x10806b1c65912a3dad9eed5c11c8489639cbc1fc782cc5ca9c75b3b8d6dcd924. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZMHM2333244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x115a2a0a56ebd71c85188a3ef1ce3e61414f157544edc4529d15fba23d5d4525. 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/QZS672477633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba801e9a3392ed026aeb7f27ecd984306cbe0489d5606f4eda6115f5238bfd1. 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/QZS672460472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75a40eb5b9c2c6ecd24303ca83013b2fbbf0aba007dce24e33d92b5ef78aa330. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/NLRD52416845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x994aded3b5fe6ab01aced6a4885b225c612b8ed41958171316910fba763999c4. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZS642547772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fe0059cf913e6b0f24251f4147d0f38fca448a56aeb2909d3b6a5fc1e40c870. 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/QZMHL2571584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7c7e63bbfaa0309ff290467d392c531586b14fa6cb9526d1fc8f5a44f057f64. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QZMHP2539259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2920a1ff980afd8dc8c816fcbf14f129205e8ff9b6e9b8916bf1a3b36a8c1f5e. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZS632532352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89929930d69045282657cbf8c326c3331f927a9dedb1b0a239bc699954cd7d33. 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/QZJRB2595045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04e72a1727fbcccbd08025357a16b43e79acff5939fbc83e02d5fe3c14df5900. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZS672594682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b58aacb2bf9a13c2cdc74435260922cc3b005aa0f29e3466386a0e4173fe473. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZJRB2561885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c6078684c8041d2503a402e696095adce807658733acc418acfc2a84673482f. 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/QZHZD2571372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x224ffc5e985f04f3a533ea3f928c7483b47f10a5e5a7f81f7cb923f7b97030ca. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/QZHPJ2538836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x521fabf50cfbf23cde2b8370dd5eb88b8930eb37666ac9100b28a532d173e1dc. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZJRC2598877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5ca528586b0d754a82fa4175a7c0905293d9a407f4366a8d6e5c168fb56408b. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QZS672585727.