Thank you for your answers. I guess this closes the case, sadly bitcoin network was made this way, as it would be a good way to prevent the theft as it could work as an second layer of security and a new market for security companies.

@jseverson
Thanks for your concern regarding keeping my btc safe, fortunatelly it's not the case, this question was raised long time ago when I had a transaction that took days to confirm because of low fees and I read first about purging, since it was long ago and knowledge back in time related to btc was harder to come I hadn't the answer, but it resurfaced as btc prices raises and the general concern for own security as well.

@DannyHamilton
For my statement related to "above the average": the average have quite low knowledge about the network itself, I can garantee that the majority that uses bitcoin today have no idea about what the blockchain is, less about how the transaction works, what is the confirmation, and so on. Therefore, I'm quite sure that I have it above the average, which doesn't mean that I know a lot. Yet, I appreciate your humbleness and will take it as a lesson.


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Still on this subject, if you get to see that your coins were to be moved from your wallet and do a double spent directing all your btc to another wallet you own, but with a high fee in order to have it confirmed next block, for example, would it in practice prevent the theft as it would be confirmed first and the other transaction would be nullified as there would be no source btc for it to complete?

I'm thinking here about how we can have a safer environment for people that want to feel safer, as I'm pretty sure mistakes happen and sometimes even hardware wallets get in trouble. Right now (and probably ever), the safest way I can see is doing the transaction offline then broadcasting it, never ever touching your main wallet alive. But this is too much a hassle for the ordinary user.