OpenZeppelin is a library for writing secure [Smart Contracts](https://en.wikipedia.org/wiki/Smart_contract) on Ethereum.
OpenZeppelin is a Solidity library of secure smart contract components for Ethereum.
With OpenZeppelin, you can build distributed applications, protocols and organizations:
- using common contract security patterns (See [Onward with Ethereum Smart Contract Security](https://medium.com/bitcorps-blog/onward-with-ethereum-smart-contract-security-97a827e47702#.y3kvdetbz))
- in the [Solidity language](https://solidity.readthedocs.io/en/develop/).
This repository is a fork with the modifications necessary to be used as the ZeppelinOS stdlib.
> NOTE: New to smart contract development? Check our [introductory guide](https://medium.com/zeppelin-blog/the-hitchhikers-guide-to-smart-contracts-in-ethereum-848f08001f05#.cox40d2ut).
## Getting Started
OpenZeppelin integrates with [Truffle](https://github.com/ConsenSys/truffle), an Ethereum development environment. Please install Truffle and initialize your project with `truffle init`.
```sh
npm install -g truffle
mkdir myproject &&cd myproject
truffle init
```
To install the OpenZeppelin library, run the following in your Solidity project root directory:
```sh
npm init -y
npm install -E openzeppelin-solidity
```
**Note that OpenZeppelin does not currently follow semantic versioning.** You may encounter breaking changes upon a minor version bump. We recommend pinning the version of OpenZeppelin you use, as done by the `-E` (`--save-exact`) option.
After that, you'll get all the library's contracts in the `node_modules/openzeppelin-solidity/contracts` folder. You can use the contracts in the library like so:
OpenZeppelin is meant to provide secure, tested and community-audited code, but please use common sense when doing anything that deals with real money! We take no responsibility for your implementation decisions and any security problem you might experience.
If you find a security issue, please email [security@openzeppelin.org](mailto:security@openzeppelin.org).
## Developer Resources
Building a distributed application, protocol or organization with OpenZeppelin?
To learn more about using OpenZeppelin in ZeppelinOS, make sure to read [*Using the stdlib in your app*](https://docs.zeppelinos.org/docs/using.html) and the rest of the docs!
## License
Code released under the [MIT License](https://github.com/OpenZeppelin/openzeppelin-solidity/blob/master/LICENSE).
