Escrow account creation in the example ICO contract from openzeppelin

Question

I am understanding the ICO as explained in openzeppelin https://github.com/OpenZeppelin/openzeppelin-solidity/tree/master/contracts/examples

When I called the "Buy tokens" the beneficiary is getting the tokens but the "Ether" is reaching the an Escrow account.

Question:

1. In the example contract where the Escrow account is getting created?

2. Does the contract hold the private key of the escrow account?

3. Please point me the code

Reference Transaction - https://ropsten.etherscan.io/tx/0xb7812ca370cec365b6e0e50fe97ff637f8fdefcf5a31a8ed3420f76e0133b41a#decodetab

Answer 1

_forwardFunds has been overwritten in RefundableCrowdsale

/**
 * @dev Overrides Crowdsale fund forwarding, sending funds to escrow.
 */
function _forwardFunds() internal {
    _escrow.deposit.value(msg.value)(msg.sender);
}

take a look on RefundableCrowdsale's constructor

constructor(uint256 goal) internal {
    require(goal > 0);
    _escrow = new RefundEscrow(wallet());
    _goal = goal;
}

the escrow contract has 0xF65bafE7D13AC5c44D12B79E293DE85aa4Cfd7C4 address. that is why value was transferred to escrow address, but not to the wallet address

Answer 2

In the example you linked, the wallet receiving the Ether is in the Crowdsale contract. Each transaction forwards Ether to this address, called _wallet.

You are asking about how SampleCrowdsale.sol works. If you look at lines 48-51, you will see that this contract is simply created a capped and timed crowdsale that is refundable. It does this by creating each of those contacts that it imported at the top of the file.

To get to your answer, look at line 48, Crowdsale(rate, wallet, token). These three parameters are pass in when creating this top level contract. When line 48 gets executed, Crowdsale gets deployed with the given parameters.

Looking at Crowdsale.sol, you can see that its second parameter is wallet, which gets set equal to the global variable, _wallet upon contract creation. The comment above the declaration of _wallet states, Address where funds are collected, which tells you that this is where the Ether is going.

From here, you can look into the buyTokens() function that users call to contribute to the crowdsale. Line 140 calls the _forwardFunds() function that simply sends all of the Ether in that transaction to _wallet.