BlastCrash only supports withdrawals on the Blast network. This means that you need to withdraw to an address that you control on Blast.
Most standard EVM compatible accounts (EOA) are functional on different chains and controlled by the same private key. This is why you can have the same address on Ethereum Mainent, Blast, Etc in MetaMask.
However, this is not the case for smart contracts. If you try to withdraw Blast Network Ethereum to an address for an Ethereum Mainnet smart contract, the coins are almost certainly going to be lost.
If you have any doubts about withdrawals and how to withdraw to a valid Blast Network address please don’t hesitate to contact us in game chat on our Discord.