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 0x4bc5bd2685509bfb8b3f09b0cd2ee306e2a9f882a9829830838f911b3728d23e. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/04059d8d-336d-4525-9a4f-9fb77e255437.json and https://artists.proofprofile.net/proofs/artist/04059d8d-336d-4525-9a4f-9fb77e255437.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 0xe8cf6f3fc32e2e93cc15829f73e218196a0b85b1b67cfd417fa441b79c213c00. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/GBKQU2442645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd07de7cb12c0f1a01d549f6958716c77f75a43907df7f7f11ec922a0d3c8c585. 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/GBKQU2528296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfab8d7af038f77f754f257b36333be7c0683e0f0651933ca442f7399781cc074. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GBKQU2528923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf960b4f3a1391699d25a5182da583a435252c818925e8885f99111e03de2ca8b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBKQU2528925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d20e4e37edd8412f6f55ae0af77fe05f30c05b3f4c651150475a928637e77a0. 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/GBKQU2520926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf86574e6aefd15c980031f07216380b0ebaffbc84b44794c05e2f9b76ace6ad7. 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/GBKQU2515443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01f9e7bde5c50fa07364430ad302a6eb908673e09e0c1e288034a8400e5d3a24. 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/GBKQU2516038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff8149ae72f519099347680cf5577e1717cc3ff6496906afed1dab50c80df0fc. 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/GBKQU2510445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8b1276d3ee848d280743d3bd323852002fb8070f042757d07c28cec9f0cd473. 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/GBLV62423415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7400e291b310d3f8e72e48af8b7769a9c0a5a035c9cd22561477044b427b048. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/GBLV62422707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43d305dbed7f87b4ff2a28147c2c3723b0a4b038c61bb7eaec2f163587b65ccf. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/GBLV62408222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab44d525be6f0d1f41d114aa2555827addd8993ca465706bc09410f011fd1188. 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/GBLV62413033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a38333b208c20c9cbd00e64f0830b9da0e87aa3e94a817ee163616eb044159. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/GBLV62408099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d2cd5445a2f9102d6fbe16f38b1ad1af92712783f504eae42e376f87cef1d03. 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/GBKQU2499377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b9230f1180262671d78de93adbd31843909784c906b3ef42705132b274111a5. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/GBKQU2498284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x254e8572ef6396f9bf049ca407f4a7d0279a20f3558926cdb3ec1ef494036a1d. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/GBKQU2497480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f8bc562117191caed50b86c22af3e504ae4ed7c6e0158f86a0a3090580ed54. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/GBKQU2491991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cb07dc0d25712c2200851568f271d22c6cb0882d6262c55a0d15ae20439120b. 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/GBKQU2490354.