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I need a few more web3 things from the ethereum_common node.
* _current block number_ - to let lot publisher know where to start while computing deadline,
* _eth / token balance_ - to let CPS know its income,
* _approved amount_ - to check how much tokens already approved to liability factory and should I approve more for next operation.
Can you implement it or give a direction on how to do it? Seems like ERC20 node is not a place for things like balance or block number.