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What is the formula for retrieving the blockhash of 1) previous block and of 2) current block?

  • You cannot get the block hash of the current block from inside the EVM. – Jesbus Apr 10 '19 at 20:29
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    is that because it doesn't know the current block till it has been settled which means that it will be a past block anyway? – NowsyMe Apr 10 '19 at 22:32
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You can get the previous block's hash by using blockhash(block.number - 1). However, as mentioned in the comments, you cannot obtain the current block's header within that transaction because the transaction that is running has not been included in the block yet.

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