Hey there! Let's break down the most likely reasons why your Account2 isn't getting reward tokens when calling GetReward() after the crowdfunding ended—even though ETH was successfully sent to the beneficiary. Since I don't have your exact contract code, I'll cover the most common pitfalls in crowdfunding reward systems that cause this issue:

• Missing or incorrect eligibility checks
  Chances are your GetReward() function isn't verifying that Account2 actually contributed during the crowdfunding window. Double-check if you're tracking contributors properly—like with a mapping(address => uint256) public contributions mapping. Make sure this mapping gets updated every time Account2 sends ETH to Eqzip. Also, add a check like require(contributions[msg.sender] > 0, "No contribution recorded") at the start of GetReward() to block non-contributors.

• Broken crowdfunding end validation
  If your function doesn't confirm the crowdfunding has actually ended, it might silently fail or revert. If you have an endTime variable, ensure GetReward() checks block.timestamp >= endTime (not >—this could miss the exact end second). Without this check, the function might behave as if the crowdfunding is still active, even if you think it's over.

• Reward token transfer/minting logic errors
  If Eqcoin is an ERC20 token:

  • If you're minting rewards, confirm Eqzip has permission to mint Eqcoin tokens (e.g., if Eqcoin uses mint access controls, Eqzip needs to be added to the allowed list).
  • If you're transferring from a pre-allocated pool, check that Eqzip has enough Eqcoin balance to cover the reward.
  • Always use safeTransfer (from OpenZeppelin's ERC20) or add a check for the transfer return value: require(eqcoin.transfer(msg.sender, rewardAmount), "Reward transfer failed")—silent failures here are super common.

• No reward claimed tracking
  You might not have a flag to prevent duplicate claims. Add a mapping(address => bool) public rewardClaimed mapping, and set it to true right after sending the reward. If Account2 already claimed (even accidentally), the function will skip sending tokens again.

• Incorrect reward calculation
  If rewards are based on contribution size, double-check your math. For example, a formula like rewardAmount = (contributions[msg.sender] * totalRewards) / totalContributions can fail if totalContributions is zero (division by zero revert) or if variables like totalRewards weren't initialized correctly.

• Permission gaps between contracts
  Make sure Eqzip is authorized to interact with Eqcoin. If Eqcoin uses access controls (like onlyOwner for minting), Eqzip needs explicit permission. Or if you're using a reward pool, confirm you transferred the required Eqcoin tokens to Eqzip before the crowdfunding started.

Pro Tip: Add detailed require() statements with clear error messages to your GetReward() function. For example:

require(block.timestamp >= endTime, "Crowdfunding hasn't ended yet");
require(contributions[msg.sender] > 0, "You didn't contribute");
require(!rewardClaimed[msg.sender], "Reward already claimed");

This way, you can easily see why the function fails by checking the revert reason in your blockchain explorer or testing tool.

内容的提问来源于stack exchange，提问作者nju2006