token vesting escrow with cliff and clawback

Related tags

Miscellaneous ethereum vesting
Overview

Yearn Vesting Escrow

A modified version of Curve Vesting Escrow contracts with added functionality:

  • An escrow can have a start_date in the past.
  • The first unlock can be delayed using cliff_length.
  • An ability to claim partial amounts or use a different beneficiary account.
  • An ability to terminate an escrow and clawback all the unvested tokens using rug_pull. The recipient is still entitled to the vested portion.
  • Factory admin controls removed, anyone can deploy escrows, funds are pulled instead of pushed.
  • Factory emits an event which allows finding all the escrows deployed from it.

Contracts

Usage

$ brownie console --network mainnet
funder = accounts.load(name)
factory = VestingEscrowFactory.at('0xF124534bfa6Ac7b89483B401B4115Ec0d27cad6A', owner=funder)
factory.deploy_vesting_contract(token, recipient, amount, vesting_duration, vesting_start, cliff_length)

Ethereum mainnet deployment

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Comments
  • Add escrow tracking and vesting_duration assert

    Add escrow tracking and vesting_duration assert

    Changes only affect factory

    All the changes are applied only in the factory contract, but all the logic that holds and handles money is in the other contract, VestingEscrowSimple.vy, thus the changes are extremely safe since factory only handles instantiation of new contracts.

    vesting_duration assert

    As mentioned by 0xalpharush from TrailOfBits on twitter, there's a very extreme edge_case where if vesting_duration is 0 and admin renounces ownership, funds would get locked in the contract. This update prevents that by adding a check on new escrow creation to force vesting_duration > 0 since it makes no sense for it to be 0, as then funds can only be clawed back by admin and they will never vest.

    escrows tracking

    There are chains where getting all events that have been emitted in the lifespan of a contract is very difficult or takes a lot of time, so to help in those cases we add an array that tracks all instantiated escrows, making it possible to query everything needed from state.

    opened by 0xngmi 1
  • feat: add ability to change recipient (in case of key loss)

    feat: add ability to change recipient (in case of key loss)

    This PR adds the ability for the admin to change the recipient, in case they lose access to their claiming keys, or a number of other reasons why they might not be able to call claim anymore.

    This has similiar security properties as rug_pull for the recipient role, with the added benefit of not losing access to what they have already been vested when rug_pull gets called. However, this method can be abused by the admin to steal more funds than what rug_pull can do, so a 1 week delay is added to prevent governance from being able to take more than what they can get from rug_pull.

    opened by fubuloubu 1
  • refactor: upgrade some of the language and formulas

    refactor: upgrade some of the language and formulas

    This PR just simplifies/clarifies some of the formulas.

    I thought there was a potential bug, but turns out it was okay once I refactored it to be clearer.

    opened by fubuloubu 0
  • Suggestion: add sweep function for potential stucked tokens

    Suggestion: add sweep function for potential stucked tokens

    This is from experience with current version of vesting contract.

    Some vested tokens could be accidentally claimed to same vesting contract and the lack of sweep function doesn't allow to recover them.

    Also can be useful in case other tokens are sent to the contract accidentally.

    This sweep can be called by the recipient of the vesting, since it should not have access to locked balance, only balanceOf of erc20 provided through argument address.

    opened by storming0x 0
Owner
core dev, yearn.finance
null
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