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 0x6a9b2dd9556f7b76cb4752a850431366871affa17da0785cdaa967f8048fa0bf. 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/823242cd-88af-4951-bce2-121e6d5f126b.json and https://artists.proofprofile.net/proofs/artist/823242cd-88af-4951-bce2-121e6d5f126b.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 0x89b1b5dbd3545ea29ba1bd930dd4441baecf2e03fa820a1abf3be783f7a922b3. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZKDK2038349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a7729ccea14162c9a9c960e74e9318b7d5dbf872e3cee746f7caa2df6bd169f. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZKDK2258236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd32d6ee1257db0a9db177fffdf2534ec0a78b42133c38efcbd46c6f0b8896232. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZS672220955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2643e960ceee458ab50b1471f55b72a73f57f30efe7d0148f70bc6510d591a2. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZMHM2339360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfa33f702ba809024f48007481c4fa3e902e105091fc6fb5686534969eb80907. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZS642128070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00becd6924a45ea8c49fed3eaf90ff26d77ac4e69909daa3b8dea2622064d24f. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZMHP2016657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd71519f2c8ed0a169077729604f7c5dbce8dfae04848dbaa6cf011d8e183692. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZMHM2074754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d6fed799c0807ce5d617f2506371b777d66611b72c7aba80b826d4a82b13d8e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZMHL2034108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaccd06b428c3ec075b6f11a1922e3a046be2eb959d35a136dc037791824aa251. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZMHL2358527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ae88bb1eff0b671a1f9ef2c9342e479208cbbed68176c9f7f1d267d73bf1b37. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZS632153235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62c531e9edac8dd6338725a79f50df3efeabbb925fa5ffaf6e14b951254879c2. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZS652100846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2c772d933c59af597cdede87b683a0d0dae29a863c8b31bdff87c3ea22ec84e. 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/QZS672105364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9797f52ed3c2ac866eeea72ad8091a66b890f482dc85133886d7e2991fdcf01c. 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/QZS632200976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6afc84b242142e7bc8a37703fe29af77ab7cad28833d1d474ab5a39da5c0581. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZKDK2119906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x009ffa0df068d59c315784a9a4fbe973ef57b97cd5a3cd63465fe5374bb0244a. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZS672283917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a7729ccea14162c9a9c960e74e9318b7d5dbf872e3cee746f7caa2df6bd169f. 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/QZKDK2258236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd32d6ee1257db0a9db177fffdf2534ec0a78b42133c38efcbd46c6f0b8896232. 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/QZS672220955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa164283d4f3a28da39953df688228c6f0ae44356cb7a1c7ec59e6de5f709bbb. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZS642222232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ded0835a5bc5e2f6c07dbd8c2ecd390d5a554edf77351ed1b6b1eb31388ef72. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZMHN2358448.