ERC-7660: A Protocol for ERC20 Tokens Which Released Based On Predefined Periods Controlled

ERCs
1 
This protocol introduces improvements in the following areas:

1. ERC20 Tokens and Linear Release Functionality.
2. Online Representation of ERC20 Balances.
3. Lock-Up Functionality for ERC20 Tokens.
4. "Sorter" Algorithm.
5. Low-Cost Swap Algorithm.
6. Transaction Fee Collection Mechanism.
  • Sorter && Low-Cost Swap Algorithm
    function _handleTokenTransfer(address from, address to, uint256 amount,uint256 toAmount) internal virtual {
        claimRelease(from);
        uint256 fromBalance = _Owned[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _Owned[from] = fromBalance - amount;
        }
        //update to vestInfo
        if (!_isExcludedVest[to]) {
            claimRelease(to);
            uint startTime = block.timestamp / period * period;
            uint pos = vestCursor[to];
            VestInfo storage toInfo = userVestInfo[to][pos];
            if (toInfo.startTime != startTime) {
                if (pos == 6) {
                    pos = 0;
                } else {
                    ++pos;
                }
                toInfo = userVestInfo[to][pos];
                toInfo.total = toAmount;
                toInfo.released = 0;
                toInfo.startTime = uint128(startTime);
                vestCursor[to] = pos;
            } else {
                toInfo.total += toAmount;
            }
            toInfo.updateTime = uint128(block.timestamp);
        } else {
            if(_isSwapRouter[to]){
                _Owned[to] += amount;
            }else{
                _Owned[to] += toAmount;
            }
        }
    }
  • linear Release
    function claimRelease(address account) public {
        uint canReleaseTotal;
        for (uint i = 0; i < 7; i++) {
            VestInfo storage info = userVestInfo[account][i];
            if (info.startTime == 0 || block.timestamp <= info.startTime || info.total == info.released) {
                continue;
            }
            uint canRelease;
            if (uint128(block.timestamp) >= info.startTime + duration) {
                canRelease = info.total - info.released;
            } else {
                uint temp = info.total * (block.timestamp - info.startTime) / duration;
                canRelease = temp - info.released;
            }
            canReleaseTotal += canRelease;
            info.released += canRelease;
        }

        if (canReleaseTotal > 0) {
            _Owned[account] += canReleaseTotal;
        }
    }
  • Linear balance
    function balanceOf(address account) public view virtual override returns (uint256) {
        (, uint256 canRelease,) = getCanReleaseInfo(account);
        return _Owned[account] + canRelease;
    }

    function getCanReleaseInfo(address account) public view returns (uint256 total, uint256 canRelease, uint256 released) {
        for (uint i = 0; i < 7; i++) {
            VestInfo memory info = userVestInfo[account][i];
            if (info.startTime == 0) {
                continue;
            }
            released += info.released;
            total += info.total;
            if (block.timestamp <= info.updateTime) {
                canRelease += total; //Just for swap
            } else if (uint128(block.timestamp) >= info.startTime + duration) {
                canRelease += info.total - info.released;
            } else {
                uint temp = info.total * (block.timestamp - info.startTime) / duration;
                canRelease += temp - info.released;
            }
        }
    }
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