Grobelny (feminine: Grobelna) is a Polish surname. Notable people with the surname include: Igor Grobelny (born 1993), Belgian-Polish volleyball player Jędrzej Grobelny (born 2001), Polish football
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 0xcd379b0b0cfb428dbedee583aa44e4e27ccfa4bc64acb6b317cf93fa15af87b1. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/854b4bc0-da36-4955-922b-5242d1e27107.json and https://artists.proofprofile.net/proofs/artist/854b4bc0-da36-4955-922b-5242d1e27107.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).