Non-Existent Account Transfers and Penalties
In addition to illegal operations, transferring TRX/TRC10 to non-existent accounts also incurs a full penalty of the fee_limit. As users normally set the fee limit to 1000 TRX (max), this is a significant penalty and can be even more costly if the user attempts to retry the operations automatically.
Penalized Contracts Examples
Transferring TRX into a Non-Existent/Invalid Account
pragma solidity ^0.4.23;
contract Invalid {
function transAddr() public payable {
address invalid = 0x1234aabb;
invalid.transfer(10 trx);
}
function transAddr2(address addr) public payable {
addr.transfer(10 trx);
}
}
In the above example, transAddr always fails and consumes the fee_limit. In the more common case of transAddr2, the developer should make sure addr is pre-validated in either Tron-Web or some other existing address. Otherwise, the user pays for the fee_limit penalty.
Transferring TRX into Itself
pragma solidity ^0.4.23;
contract Self {
function transAddr() public payable {
address(this).transfer(10 trx);
}
function transAddr2(address addr) public payable {
addr.transfer(10 trx);
}
function transAddr3(address addr) public payable {
require(addr != address(this));
addr.transfer(10 trx);
}
}
Similarly, transAddr always incurs the fee_limit penalty. transAddr2 will fail the self-transfer case if addr is the contract's address itself. transAddr3 protects against the self-transfer penalty but still suffers from the non-existent account problem above.
TRC10 Token Transfer into a Non-Existent/Invalid Account
pragma solidity ^0.4.24;
contract TRC10 {
function sendBalance(address to) public payable {
trcToken id = msg.tokenid;
uint256 value = msg.tokenvalue;
to.transferToken(value, id);
}
function sendBalance2() public payable {
trcToken id = msg.tokenid;
uint256 value = msg.tokenvalue;
address(this).transferToken(value, id);
}
}
Similar to the TRX transfer above, if to account does not exist, sendBalance fails with a fee_limit penalty. The self-transfer case sendBalance2 also incurs fee_limit.
Updated over 5 years ago