Do miners calculate the balance including the mempool?

Let's say you got 1 BTC. And you do the following:

  • Send a transaction of 1 BTC to address A; fee: 1 sat/byte

If you'd only calculate what's in the blockchain, you'd still have a balance of 1 BTC. But if you also include the mempool you'd have a balance of 0.

Am I now able to send a second transaction, such as:

  • 1 BTC to address B, fee: 1000 sat/byte

The second transaction would likely be confirmed first; what would then happen to the first one? Would it simply be lost since now I don't have enough balance anymore?



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