TokenVesting

src/TokenVesting.sol — locks any ERC-20 and releases it linearly to a fixed beneficiary.

Constructor

constructor(address _token, address _beneficiary, uint64 _cliffDuration, uint64 _duration)

Parameter	Description
`_token`	ERC-20 to vest (typically AUR)
`_beneficiary`	Immutable recipient of released tokens
`_cliffDuration`	Seconds from deployment until the cliff
`_duration`	Total vesting duration in seconds (`>= _cliffDuration`)

Timestamps are anchored to block.timestamp at deploy:

State var	Value
`start`	`block.timestamp`
`cliff`	`start + _cliffDuration`
`end`	`start + _duration`

Reverts with InvalidDuration() if _duration == 0 or _cliffDuration > _duration.

Deposit

function deposit(uint256 amount) external

One-time, one-way. Transfers amount tokens from msg.sender into the contract. Subsequent calls revert with AlreadyDeposited(). Reverts with ZeroAmount() if amount == 0.

Caller must approve this contract before calling.

Vesting Schedule

function vestedAmount(uint64 timestamp) public view returns (uint256)

Time range	Returns
`timestamp < cliff`	`0`
`cliff <= timestamp < end`	`totalAmount * (timestamp - start) / (end - start)`
`timestamp >= end`	`totalAmount`

Accrual is linear from start, not from cliff. The cliff makes the entire accrued amount claimable in a lump sum on first release.

Example: 1,000 tokens, 30-day cliff, 365-day total. At day 30, (1000 * 30) / 365 ≈ 82 tokens are immediately claimable.

Release

function release() external

Transfers all currently releasable tokens to beneficiary. Anyone can call; tokens always go to the fixed beneficiary, never to msg.sender.

Check	Error
`block.timestamp < cliff`	`CliffNotReached()`
`releasable() == 0`	`NothingToRelease()`

State

Variable	Type	Description
`totalAmount`	`uint256`	Set by `deposit`
`released`	`uint256`	Cumulative tokens already transferred
`deposited`	`bool`	Guards against double-deposit

Events

Event	Emitted by
`Deposited(address depositor, uint256 amount)`	`deposit`
`Released(address beneficiary, uint256 amount)`	`release`

Custom Errors

Error	Condition
`AlreadyDeposited()`	Second call to `deposit`
`ZeroAmount()`	`deposit(0)`
`InvalidDuration()`	`_duration == 0` or `_cliffDuration > _duration`
`CliffNotReached()`	`release` called before cliff
`NothingToRelease()`	No vested tokens pending release