Rootstock is the first and longest-lasting Bitcoin sidechain that uses Bitcoin security and Ethereum smart contracts.It is EVM-compatible and can operate on blockchains supporting Ethereum Virtual Machine standard.With Rootstock, you can execute smart contracts on Rootstock Bitcoins, which can be created by sending Bitcoins to Rootstock.The platform allows the creation of decentralized apps without the involvement of third parties.Transactions on the RGTC blockchain require the payment of gas, and you can offer minimum, average, or more depending on the speed.In the case of smart contracts, you pay for opcodes or blockchain operations. Optimizing contracts can save v-money.Rootstock's virtual machine, RVM, supports the functionality to run Ethereum dApps.Rootstock uses powpeg and peg-in and peg-out processes that allow you to convert your Bitcoins and Rootstock Bitcoins.The documentation explains how you can save gas by writing optimized smart contracts.Rootstock is a gateway to a vibrant ecosystem of dApps that continues to evolve to become fully trustless.