Nano (XNO), previously RaiBlocks, is a decentralized digital currency that addresses inefficiencies in existing cryptocurrencies. It uses a unique block-lattice architecture, enabling immediate transaction processing and scalability. The Nano network offers instant, fee-less transactions with unlimited scalability through an efficient consensus mechanism called Open Representative Voting (ORV). Nano is used for peer-to-peer transactions and is popular in microtransactions due to its instant and fee-less attributes. It was created by Colin LeMahieu in 2015 to address issues of scalability and fees in existing cryptocurrency designs.