Can I use ERC-20 Snapshot to create a smart contract that can issue dividends?

e_n · February 15, 2022, 11:36pm

Let's say I have a pre-existing BEP-20 token live on the mainnet.

I need to develop a smart contract that can get the balances of the tokens users have staked in a staking pool, and issue a dividend bi-weekly based on what percentage of the total staked tokens they themselves have staked. Can I do this with the ERC-20 snapshot extension?

Skyge · February 16, 2022, 12:51am

Maybe no, cause your token has been deployed, but if your token is upgradable, this is possible, and then just like you said, use ERC20Snapshot contract, then override function _snapshot to expose it to use.

You can also do this with an off-line way, that is check the balance of all users manually.

e_n · February 16, 2022, 1:31am

What if I created a smart contract that inherited from ERC-20 Snapshot....Then I could create an interface with the pre-existing contract, and use the ERC-20 snapshot functions while passing them info from the pre-existing contract?

Please help ;_; First day in my new job, already getting my butt kicked

arsalanShiran · February 19, 2023, 7:41pm

If I understand you correctly. you should save amount of token each user have. but if you read

github.com

OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/extensions/ERC20Snapshot.sol

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/extensions/ERC20Snapshot.sol)

pragma solidity ^0.8.0;

import "../ERC20.sol";
import "../../../utils/Arrays.sol";
import "../../../utils/Counters.sol";

/**
 * @dev This contract extends an ERC20 token with a snapshot mechanism. When a snapshot is created, the balances and
 * total supply at the time are recorded for later access.
 *
 * This can be used to safely create mechanisms based on token balances such as trustless dividends or weighted voting.
 * In naive implementations it's possible to perform a "double spend" attack by reusing the same balance from different
 * accounts. By using snapshots to calculate dividends or voting power, those attacks no longer apply. It can also be
 * used to create an efficient ERC20 forking mechanism.
 *
 * Snapshots are created by the internal {_snapshot} function, which will emit the {Snapshot} event and return a
 * snapshot id. To get the total supply at the time of a snapshot, call the function {totalSupplyAt} with the snapshot

This file has been truncated. show original

we have function (_updateSnapshot) to push data to values array of structure Snapshot. but this is a private function that we can't inherited.

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Can I use ERC-20 Snapshot to create a smart contract that can issue dividends?

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