Marcin Bors (born 30 May 1978) is a Polish record producer, sound engineer and multi-instrumentalist. He started working as a sound engineer in the late 1990s, mostly with heavy metal bands such as A
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 0x9fb062aeea6abd5f3ea80c6eae589992512ac618e880f758230e77e161dc640e. Chain 2 (Bitcoin): anchored in block 954615 (2026-06-20T22:44:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c52e6b04-40c2-44df-8429-637d85010c40.json and https://artists.proofprofile.net/proofs/artist/c52e6b04-40c2-44df-8429-637d85010c40.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).