Heat Ledger is a cryptocurrency written in Java that aims to solve scalability problems associated with Bitcoin and other cryptocurrencies. Heat Ledger offers sidechain solutions for corporate and personal use, and has a built-in decentralized "coin-to-coin" exchange, that allows users to trade cryptoassets between themselves or even fiat currency pegged assets. 

Hear Ledger's block rewards are given out according to a traditional Proof of Stake system and a new Proof of Presence system that checks for nodes that host the block files online.