Side chains are blockchains that are interoperable with each other and with Cryptocurrency Address A Cryptocurrency address is used to receive and send transactions on the network. An address is most commonly represented as a string of alphanumeric characters and sometimes referred to as wallets. Addresses can also be represented as a scannable QR code.. Advantages of side chains include increased fraud prevention associated with alternative Transaction Fee A transaction fee is imposed on some transactions sent across the network such as the network that supports bitcoin. It is awarded to the miner that successfully hashes the block containing the relevant transaction..