A solution in blockchain and Ethereum platform, this project consists in a implementation of a time clock. The implementation was done using Solidity[1], a contract-oriented high-level language. This project aims, primarily, offer a simple time clock for management propouses using as little gas[2] as possible. The execution of the source code can be made online using Remix[3], a web browser based IDE. For more informations about the tool, refer to [4]. [1] https://solidity.readthedocs.io/en/latest/ [2] http://ethdocs.org/en/latest/contracts-and-transactions/account-types-gas-and-transactions.html#what-is-gas [3] https://remix.ethereum.org/ [4] https://remix.readthedocs.io/en/latest/