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 0xf8f3a6c4dc8a578c4e9cac6d2e8d74d66e89da84f263ce1f712b8dd76cc0e5f1. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fce62285-cd89-4c66-9c20-97d62d3aa00b.json and https://artists.proofprofile.net/proofs/artist/fce62285-cd89-4c66-9c20-97d62d3aa00b.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 0x3851840546afb45189890cf4475a2feffca1176bbc9a1b6905fbb3eb854d4023. 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/TCAFG2063313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4f731ca241d9a253df362490c68ec9d6bc2c74cf1dbd394a2e18d6f494c0ce9. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/TCAGB2263106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4981bcff304dceb17e73689d65402a500f134d933071fc66732add46bccc2b9d. 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/TCAGJ2272994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3015f852d7e26447ef793bc6ef14501d6066b9ac43da7a032856c94fdace43bf. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/TCAHD2346126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6fdecdfb99624a7762339584b4eef1321973a8814e17f291443a556c3d59796. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/TCAHJ2353932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc301dc9502cda6bd2204ce94fd743c792fa31fa2e45610d894f8e97a8a6f759d. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/TCAHU2448756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c189d02c7cf78fc3959344b1acf152e08a097205db4ee29852a9d2e7444f6c9. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/TCAIA2470747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2176b44f5d67aac77ea002260b25622919abc0f7146b96623eba7431eeebeea0. 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/TCAIB2465327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76da09c4941477bd5bac53c5306a9de901048d51876c58343880f9d772eb1f18. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/TCAIN2448244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5a804923d500a8ff790ac9b8379e31f1ee6b2c4ea0666f44e5943a20efaad92. 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/TCAIP2404894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae8b4f2eeec5d7e52aa0ef95a972c872c1c698f726ac39cdbf91901348738fb9. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/TCAJC2418236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66796ee479d60b7f66d995abb6fe4a4bd311243917ff375dbb7ca15d97856630. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/TCAJJ2552148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x486f30ce44bb1be1e45dc232669ead25a4d6576348d22c86d1c16d1feb8f784b. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/TCAJN2504653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6537ca9d58bfad08e828e9600bde2cd0354fad25769f387a47513997e5a78fa4. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/TCAJU2514999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6853dd9486904ce323a8101f52492621dc3ed54bb929d5f6ea720b2cb8472c1. 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/QT65X2524231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9117ac70645e6010a47818b17f91fd8b32a5b39c46896cfa0897533bf72aeb36. 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/QT6622538276.