Finance

This document is better viewed at https://docs.openzeppelin.com/contracts/api/finance

This directory includes primitives for financial systems:

  • VestingWallet handles the vesting of Ether and ERC-20 tokens for a given beneficiary. Custody of multiple tokens can be given to this contract, which will release the token to the beneficiary following a given, customizable, vesting schedule.

Contracts

VestingWallet 

import "@openzeppelin/contracts/finance/VestingWallet.sol";

A vesting wallet is an ownable contract that can receive native currency and ERC-20 tokens, and release these assets to the wallet owner, also referred to as "beneficiary", according to a vesting schedule.

Any assets transferred to this contract will follow the vesting schedule as if they were locked from the beginning. Consequently, if the vesting has already started, any amount of tokens sent to this contract will (at least partly) be immediately releasable.

By setting the duration to 0, one can configure this contract to behave like an asset timelock that hold tokens for a beneficiary until a specified time.

Since the wallet is Ownable, and ownership can be transferred, it is possible to sell unvested tokens. Preventing this in a smart contract is difficult, considering that: 1) a beneficiary address could be a counterfactually deployed contract, 2) there is likely to be a migration path for EOAs to become contracts in the near future.
When using this contract with any token whose balance is adjusted automatically (i.e. a rebase token), make sure to account the supply/balance adjustment in the vesting schedule to ensure the vested amount is as intended.
Functions
Ownable
Events
Ownable
Errors
Ownable

constructor(address beneficiary, uint64 startTimestamp, uint64 durationSeconds) public

Sets the beneficiary (owner), the start timestamp and the vesting duration (in seconds) of the vesting wallet.

receive() external

The contract should be able to receive Eth.

start() → uint256 public

Getter for the start timestamp.

duration() → uint256 public

Getter for the vesting duration.

end() → uint256 public

Getter for the end timestamp.

released() → uint256 public

Amount of eth already released

released(address token) → uint256 public

Amount of token already released

releasable() → uint256 public

Getter for the amount of releasable eth.

releasable(address token) → uint256 public

Getter for the amount of releasable token tokens. token should be the address of an IERC20 contract.

release() public

Release the native token (ether) that have already vested.

Emits a EtherReleased event.

release(address token) public

Release the tokens that have already vested.

Emits a ERC20Released event.

vestedAmount(uint64 timestamp) → uint256 public

Calculates the amount of ether that has already vested. Default implementation is a linear vesting curve.

vestedAmount(address token, uint64 timestamp) → uint256 public

Calculates the amount of tokens that has already vested. Default implementation is a linear vesting curve.

_vestingSchedule(uint256 totalAllocation, uint64 timestamp) → uint256 internal

Virtual implementation of the vesting formula. This returns the amount vested, as a function of time, for an asset given its total historical allocation.

EtherReleased(uint256 amount) event

ERC20Released(address indexed token, uint256 amount) event

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