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 0xbf2df47dc900361d2e929260eff50d2e4b3c02add4aca54533a1ea5b8a8eabab. 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/4eb97d0b-273d-459e-a8b3-f0d6729c7d8c.json and https://artists.proofprofile.net/proofs/artist/4eb97d0b-273d-459e-a8b3-f0d6729c7d8c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Duplo (feat. Jonzon, Joey99, Kilian437 & Papke)
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 0x46f37eb0f4ef2a2a25dd5cb75dc70ad3075483aad3b055e66718c38704ff92d5. 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/DEKF22100896.
Kümmerling on ICE (feat. Kilian437, Jonzon, Grzegorz, KKuba102 & Papke)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c32e1f0e94549ab88846df43173c3a6e2b4920633beaf227d08f12d9ed2f493. 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/DEKF22100898.
Statement (feat. Grzegorz, Joey99, Kilian437, Samo104, OCboyblau, Jonzon, JulioMC & ODG)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x332fe73a4a7da8960f8c5c97137e18ebdce876cbc75997ba4e98dbfd7b3bfd74. 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/DEKF22100728.
100% (feat. ODG, Kilian437, Joey99, Jonzon, Kulturerbe Achim, OsloEinz & Papke)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fcfb98194fadb756ef1bc5d332a16bf1667a9cb93a9dc38b7393fa099a69cba. 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/DEKF22100899.
Pegel Standard (feat. Jonzon, Kilian437, ODG, Beko & Eddy-T)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x160418a967754430a7a9c496f1a986c2c79a93f4bc75aae8a5eb2f5344cd6b47. 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/DEKF22100901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x332fe73a4a7da8960f8c5c97137e18ebdce876cbc75997ba4e98dbfd7b3bfd74. 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/DEKF22100728.