PKG or Pkg may refer to .pkg file extension Package (disambiguation) Pangkor Airport, which is assigned the IATA code USM Penkridge railway station, Staffordshire, National Rail station code PKG pkg
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 0x178357dd6282c6856e5b6878e4e1a8e9b692732e07086b5a95b2ce63a366640c. 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/bc398a20-bd98-48e3-89a0-705d8d368863.json and https://artists.proofprofile.net/proofs/artist/bc398a20-bd98-48e3-89a0-705d8d368863.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).