Introduction Peercoin (PPC) is a cryptocurrency launched in August 2012 by software developer Sunny King and software developer Scott Nadal. Peercoin is considered to be the first proof-of-stake-based cryptocurrency, a type of digital currency which functions within a distributed consensus system, where ownership of digital tokens are validated based on their ownership and the amount of coins held by an individual or address. It is an open source project and the code is available on Github. What is Peercoin? Peercoin is a decentralized digital currency built on a cryptography-based protocol, with a unique energy-conservation approach to protect the network. It uses both Proof-of-Work (PoW) and Proof-of-Stake (PoS) methods to secure the network and to validate transactions. Through the use of PoW miners validate the transactions on the network and create the new blocks on the blockchain, earning a block reward in the form of transaction fees and newly minted coins. With PoS, coin holders are rewarded for holding Peercoins in their online wallet by earning more coins. Who founded Peercoin? Peercoin was developed by Sunny King and Scott Nadal in Aug 2012. While there are a number of coins today that use the same underlying technology, Peercoin was the first to use a proof-of-stake consensus algorithm, which allows for faster transaction speeds and lower energy consumption. What makes it unique? Peercoin is unique in its ability to utilize both Proof of Work (PoW) and Proof of Stake (PoS) systems, with the latter ensuring a faster transaction speed and a lower energy requirement. Peercoin also offers a unique "security cycle" which allows users to earn blockchain rewards both for mining and for holding coins in their online wallets. Where is it Used? Peercoin is currently used for a variety of payments, including digital micropayments, remittances, tipping, and online gaming. Peercoin can also be used as an alternative to regular money as it is accepted by a growing number of merchants as a means of payment. Where to Buy/Sell it? Peercoin can be bought and sold on many cryptocurrency exchanges, such as Bittrex, Poloniex, and Binance. Peercoins can also be exchanged for Bitcoin or other digital currencies in the form of peer-to-peer transactions on decentralized trading platforms such as Bisq. Conclusion Peercoin offers an alternative to other digital currencies, relying on a unique energy-efficient consensus algorithm. It is accepted on a growing number of exchanges and can be exchanged for Bitcoin or other digital currencies.