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Kong

Kong offers physical crypto notes backed by time-locked smart contracts. Its notes use secure elements and NFC verification to enable cash-like transfers and later redemption of Kong tokens.
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Description

Kong develops physical crypto-cash notes made with secure-element chips, flexible PCBs, and time-locked Ethereum smart contracts. A note’s secure element signs challenges while its associated smart contract holds the public key and enables the Kong asset to be claimed after the printed expiration date. The organization also operates a lockdrop through which users can lock ETH and later claim Kong tokens, and offers limited and bulk note releases.