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 0x8730916408f81983d8c8ddecfc2b252358faa2baa0e9556d48913e05c0ffdc6d. 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/0e0a155f-f38e-4d3b-b790-3f0715f37ca7.json and https://artists.proofprofile.net/proofs/artist/0e0a155f-f38e-4d3b-b790-3f0715f37ca7.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 0x343903b6cccd4f441b6bc934d045dadcb2038ad283f376e3dcfd8372ce801214. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BE5KW2300442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c90e1682d69d090394a3a8529394337c658d9c7a18e689a2e8ea8445a5ffb02. 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/BE5KW2300444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacb06e3a8c2212134525a1e0a91e35f36c09959b2ba8b4b7ed251c04e713f4f2. 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/BE5KW2300446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0459ff4fd2e21f375df604a6c2c47648fe445c4185fc620b3a101581f37a7658. 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/CH3132318304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a7120ac8eca73d0ff71d858325e96f5edbf917fa5d56801b4e1516c681f6a6. 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/BE5KW2300448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89ae8ad73660e96d104d8457697fc3d7216ef5e5acc4eb0ae28c2a22b3e3e85d. 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/BE5KW2300450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89fb436516497ac749fea8f74da3df0401ac001d1bffbe5220f5352187efbfef. 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/BE5KW2300352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb5ced2a57b4cabdcff9ec880dd572685e1bde258ac09ecb58986106b84fd542. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/BE5KW2300452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa54cd1896b0bfdad76070680f66e2f34df44646bdfce8d0191fd10b9cedfb90b. 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/BE5KW2300433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee35f4b5c3d60079cbfccde46513312414380b55f468ddab8eb9d3a667e48fe3. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/BE5KW2300454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0174373757472fd9bbc85be7835f5292a3d28f216da0cc6e3bdf12fe21e33f6. 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/BE5KW2300456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13a54c721fe48b98532de0ad104b63505fa73263cb647c3f2ff4e4d3239b49e6. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/BE5KW2300458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c431b59b72aeac10c54e8fc872b854839eab00c5d28a1503a4e5a4f7d6b9e8a. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/BE5KW2300460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52cf0cc0152e4bdd8e40e97827fa23a9b0bcaba317ed668c58096091de71a086. 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/BE5KW2300430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7976e41f0785ac2517e3f2463078246d2b31c0ee7ea66f8f09e3364c1d9b0009. 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/BE5KW2300421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac6f5470823bcd36ec26329358b7a7bd48bc33ea2eb093e666f704771fc133b8. 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/BE5KW2300462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x343903b6cccd4f441b6bc934d045dadcb2038ad283f376e3dcfd8372ce801214. 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/BE5KW2300442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa54cd1896b0bfdad76070680f66e2f34df44646bdfce8d0191fd10b9cedfb90b. 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/BE5KW2300433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52cf0cc0152e4bdd8e40e97827fa23a9b0bcaba317ed668c58096091de71a086. 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/BE5KW2300430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7976e41f0785ac2517e3f2463078246d2b31c0ee7ea66f8f09e3364c1d9b0009. 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/BE5KW2300421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52cf0cc0152e4bdd8e40e97827fa23a9b0bcaba317ed668c58096091de71a086. 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/BE5KW2300430.