thumb|right|250px|Grzegorz Halama Grzegorz Piotr Halama (born 2 January 1970 in Świdwin) is a Polish parodist, and cabaret actor. In 1995 he initiated Grzegorz Halama Oklasky, a Polish cabaret. He is
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 0x77cbbd981ec0fb2b582b8c4f9d8d0ac387df427518ad7abab8ee6feed17dbad0. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bb9dc528-f922-4a14-ace7-be5e0cf7822d.json and https://artists.proofprofile.net/proofs/artist/bb9dc528-f922-4a14-ace7-be5e0cf7822d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).