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 0x542aaacb33eccef17446255d904f0d7f5f08fbdb342bcb7e7ca89ddff8a43305. 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/4a9368c6-09c9-4444-95ec-f88365067bbf.json and https://artists.proofprofile.net/proofs/artist/4a9368c6-09c9-4444-95ec-f88365067bbf.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 0x8f2a4b595091096d8a059d1288d7953b066341a30eca9caebd29c431090566f8. 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/DEH742302157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4ba03d0df4c8890bf0f58eb57271a35d5fac8267e40a224fec9faae76323856. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLCK42226658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5055c492ac5f3f462fcac52d46da2804fd4e14709e5ea043f79882c7413507ea. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEH742214820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9ceac83f10e2f2f294974fe8d37d8c38f345f59e5d65bd6468b91ed415503e7. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:53:12Z), 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/DEH742170900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e8bd3504be23a3f62a71206fdf4dc2200c43fe52ad71197a58406bf8ac95ddf. 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/GBKQU2176876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7eb04cee7e92a5dd5d2e81dfb7782df87c5935ac4ea8fa89abd196494ba24db. 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/DEH742038572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a4304a4d42511a33ad0ca14969ac8faf8afbb1baf58b1a863bc0a1613bc4447. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEH742002145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2b7cf9123679b117f4eb013a1f521873b84369c31f3c1b2f5a4ffbfddd27d8b. 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/DEG931912697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bf17fe0cf91a1f172e9ad4af41046ab8827fcb7a38070772b8db7e9124ae11d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEH741915495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b50e80ed0cab5e35f513e9d9ac8188da77c5e894b26f9a62b0c659219122854. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/ITN3C1900017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ade5a98d24b1e2a13a0e4b902d614a80a4a02549501278ed7a772106589645c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEY471980138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc96761e6c506151a8d57d75e15284e976b2227295850447e16f026b5c68942df. 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/DEY471980139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x068f92328d58a397ed7c480db43d1cc6a88597c7f830ecf2cbb45eb63053a1f8. 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/DEY471980140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba9dff48a673139cba1e1d9bad5e5fbe5e47dfab0d41e65e8a4372b2fb16cae8. 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/GBLV61806654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dc8408e5445a221074dc4db750b598fa0168761bbed2e6a1ced98106d18ac42. 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/UKGGD0600061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c39564cb3caf569c5f57ee6efc8d1f64731b1fdf4db73abc119a62aba75de3b. 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/US83Z1822278.