** Draft **
This is a simple multi-recipient straight-line vesting contract with an optional cliff. The intended use is with future rounds of Radicle Seeder rewards, but it is generally applicable to other vesting situations.
The deployer must provide
admin: controls grants / revocationscoin: the vesting token (ERC20)period: the vesting periodcliff: the vesting cliff
This contract is controlled by an admin, which has the power to both grant
and revoke vesting awards.
The admin can call grant(address user, uint start, uint amount), to
create an award of size amount for user, with vesting commencing at
the given start.
To grant multiple users at once at a single start time, the admin can call
grant(address[] user, uint start, uint[] amount), with a list of
users, the start time, and a list of amounts.
Awards are indexed by user and by start time, so one user can have multiple awards with different start times. If a user already has an award at a given start time, subsequent awards will add to this.
The admin can call revoke(address user, uint start) to cancel the unvested
share of a single user award. It is not possible to revoke the vested share.
All times are expressed in seconds.
There are two configurable time variables,
period: the vesting durationcliff: the duration after vesting start when vested tokens become claimable
These can be reduced only by the admin with setPeriod and setCliff
respectively.
A user can call claim(uint start) at any time to claim their vested
tokens from a given start time. An EIP-712 equivalent is also provided.