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 0x91f9631a9ad8b9bca2883f714fda6f367879bdeb733141eae60701263246a1cc. 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/a0a2ef9d-b583-44f8-8b71-7528c68a7805.json and https://artists.proofprofile.net/proofs/artist/a0a2ef9d-b583-44f8-8b71-7528c68a7805.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 0x490dd06189b3f9485288316d1ef6c0b916c637750ef72956470efe4d96fa81c7. 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/BCRUK2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67574b0ee7d63fd67e0584a425c6f2d92b3b7aa520cfadf191c81eff58a28c63. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZNJZ2430365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x473a4b83b3df0f3b7c0f8dd1b2c2576ea41b62931116a84f28a9854a0738202d. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/GXD7V2327106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x131c61e6f1d472ae0b315dcdaf894cdf0cf37876e81f4cacb90600aebf021c6e. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QZNJV2499839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4365911fd576526b88340c9e15479e925dc12cade97d02ac43a640f2cd8d325a. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZMZ92478791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc286b242693fab56f1e49b265fc74064b65e917acc2d9c83cc76ca1794b2ee80. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZMZ92448120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x914a3f3d992bcaab4ddb3b2d433169f5afe82196e5af1b780b2245570b0e94b2. 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/QZMZ92479722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf37b15c179f06db8180806740f757dd6be29ef00d478be9c205bc3455634c7. 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/ESA112434328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce610fab34984a56a186e03116313631f6cf0622dfd535cacde63acae7b847a5. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZW9L2336750.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77267393e69fd43662f6fe88ad4d57e7e7077b5164c2dd25a40eb68b6e54027f. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/QZW9K2317666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41198232cd2182df10b3ceecb3072af2136cbd6cd0a6545f38bcbd8825f74280. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/QZTVM2336055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40fdf2a3a631e05e7b09ea11c1dc4a75ee3582e82d0e0146b88cb56a1981ba3e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTPX2347211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c04bef9c32dceeccfd3b7ed71e3cde66d6aaf0158aecd3110c61e5bf0be4595. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZNJZ2381054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60c1414f3fba71d407951fb5dcefd01f9733ad488709546a4b08aaf27b0f050c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZNJZ2380592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2093d906600eec80302307f57a65232c9ad72718fafd12c842b36c2d01efbf38. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZW9L2259987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x680a344b171ded039b0105cc64c6fa58ee9a5b78a8e64ee73a74cb77c50cd30d. 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/QZGLM2379174.