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 0xc727fe284115f89d470c58e7201537b34fb4ee2f10db4a2bc584d197b32a2390. 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/7dd3551e-6396-4713-8f4c-571821e628a4.json and https://artists.proofprofile.net/proofs/artist/7dd3551e-6396-4713-8f4c-571821e628a4.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 0xa466b56883053034f9e89a037a057e69e3d43bac9e6d376f408eefafab10c6ca. 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/FRIDO2310192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabb06a091877c2b008d26350e2c191d87bcb82753a7df1c700a3a89cca883a32. 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/FR96X1968102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x915dd18ca157fab4bf9a8ab68627a6ca1ae8ece9713619128dfed56d4886e233. 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/GBRF51700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c52afd169327ef4e59a8c65f7590ddc089ffb93bce4028a34347111b44f6a38. 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/GBCJY1900046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ca2d78b68ddbe7d7846f7b292d7fbd7065c3a07a10bcd4434c7b03961aa8248. 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/GBE281200900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5470457cc6b5ffee527c42266bc439abadaecdbf4b54853d2e21ef1f180fd9f9. 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/NLCK41045084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3f3a2146a549ac4572f214e29c491f50ac4a8af87a0b177369e7dee154c9214. 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/GBPWR1900031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3f3a2146a549ac4572f214e29c491f50ac4a8af87a0b177369e7dee154c9214. 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/GBPWR1900031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1624f282f3bd9f3b4a81c1c49b01f4d493978a238639db6c52afe4f3c88aa7e5. 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/GBXJH1000150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87c00638ab321f301939a7d31b724b27e767bbc233ef7e72afdbb81f8a5c2633. 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/GBXJH1000094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9486701ff98fab0cf0d269c9198f3213f8dd4ab9fb13a6102b98b132ecd356f. 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/GBKQU1388019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a336b4d2f7b7ebfabd7a0eb9ec5c528dfff68d0024b2d7b9829e1a6a7697417. 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/NLCK41043359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bd3cee0d82fe4bd9428ddf7fbd16022f3eba11d529817e9cba52d6bc375bb62. 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/GBRF51800032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7bb4e65f292a68043265a8c8c05b0cbc5872d3525afa8e0706dbd4d932bbec9. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/FRIDO2110027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9768159c9035103f044001dc382007c84818d1cb9d9788838473ebe42cbc49c. 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/GBPWR2300028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9768159c9035103f044001dc382007c84818d1cb9d9788838473ebe42cbc49c. 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/GBPWR2300028.