A quick question. Which EVM opcode is actually used to "deposit" the transferred Ether into the contract? From the EVM opcode list, there are only two opcodes related to the fund transfer: balance and selfdestruct, but both of them are used to "read" the fund, not actually modify the fund record.
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Ether that came along with transaction is deposited at smart contract's balance before byte code is executed, and it will stay there unless byte code execution will revert the transaction, or unless it will send this ether further.
