ZeppelinOS provides a way to link your contracts to on-chain standard libraries of reusable code.
One such library is the OpenZeppelin stdlib, which includes some of the most widely used contracts. The code in this stdlib comes from OpenZeppelin, an extremely well-tested collection of smart contracts that were only slightly modified to adapt them to ZeppelinOS.
The contracts presently included in the OpenZeppelin stdlib are:
The source code for these contracts can be found in the
zos-release branch of the