Ethereum Cookbook

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There are a lot of implementations for crowdsale contracts and you can always choose the features based on your requirements. It is strongly recommended to test and audit your smart contract before publishing it to the main network. Any bug found is irreversible and you may lose all your raised funds. You can include fail-safe methods such as pausing the smart contract to reduce the impact, but it is better to strictly check for bugs before going with the final implementation.

OpenZeppelin provides well-tested implementations of the crowdsale contract with most commonly used functionalities. It is written in an extendable manner so that you can add your own features to it. The open source library includes contracts for basic ...