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 0x4265921f8ebcc9681c784761a31a9b366dfa55d6c294a2304a88e938cbec5962. 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/939e94cf-dbc7-49be-b491-c150735a3388.json and https://artists.proofprofile.net/proofs/artist/939e94cf-dbc7-49be-b491-c150735a3388.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 0xdeb805699d86e2c028ce84db7d7a1f23ed803aec64b02d6c8c953b67b99cd02b. Chain 2 (Bitcoin): anchored in block 958493 (2026-07-18T04:34:53Z), 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/USHM91461746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6ed1aa372e53873655d45d8f83a2108dc1c75a11d8ebe799ed54a6fc0d0489d. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/USHM91461747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc312d3b8c1aa8c4e1e0899156fe0dd532411c3f3add282b628927621e34d024. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USHM91461749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a3e2be4517ea267845c780fb813c78ccc9994417be2d40cd8e73da27ef68a83. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/USHM91461750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc71c025901e95fd2b7e61c7818afa14163d17b6ff4658928ba216759ada8e4e1. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T16:06:23Z), 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/USHM91461753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0be2ac4d095cd53aae9cee902e93cba6c05f188b5ced0ad15cd9a41efa1d17f2. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USHM91461755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11ae2b366bdc442f4f4aa9392071e755a75d8de59ba1aa23800f86ed02ca3a3c. 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/USHM91461757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e5500318861c10877cd735179d17bfe3e68cb919fce6e32bea8221f432aaf4c. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/USCGH1626186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14d6c5d5bc059bf06c5909805a767c7301e2d4c090c80c67ae9fe0db9dc8c2ed. 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/USHM21643117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d846976bc6ba3a0ed325ceebfc01ff322a23dd85724f4ed92a8397672d19a87. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/USHM21643118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c333d15991e5c1da0655bf1e3cea6069b7f648651e7c5817d478f8db9cb33ff. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/USHM21643121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf266494e8a40f807ddcbfd1328eaeca24518e1bc45f41f4abf5caddf8687683. 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/USHM21643124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x671b38a234bbf8824726c0c53a95f7500de1fb64439302db81cb5849ed212b61. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:48:07Z), 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/USHM21643125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aa9354c772e380aafecd4934daf78b5941c76f23c08dbda4b6d2c778cccec76. 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/USL4Q1735029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b21d6d7d090ab209065224bff03bf4460d6aaf1e060a8abcdb0ea7e28ee4fdc. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T23:12:23Z), 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/USDY41859735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd32ec0dfe2213e3af63a650f067220c1b9f5298e9d122e02b7115bc696c42dcd. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T08:56:01Z), 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/USL4R2084717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e650c1382f6698ac8739abf8c9b8e1744a0a41d53620ec4eba1a387abb5b28e. 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/ARULW2000021.