Fake Transaction Input

[odolvlobo]

Is it possible create a fake transaction from a BTC address to another without paying any fee and also without this transaction gets ever confirmed?

Perhaps you could do it with Bitcoin Core. On the sending wallet's node, create a raw transaction with a fee of 0 using createrawtransaction and signrawtransactionwithkey. Enter the transaction on both the sending and receiving wallet nodes using sendrawtransaction so that they both see it. I assume the transaction will be added to their mempools because they are valid, but will not be relayed because the fee is too low.

I have never tried it, so I don't know if it will work.

[1715348309]

1715348309

[1715348309]

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[nc50lc]

I have never tried it, so I don't know if it will work.

I tested it and it will only work with minrelaytxfee=0
Seems like the relay setting affects the owner's mempool as well.

Otherwise, with the default relay settings, it will return with: min relay fee not met, 0 < vsize (code -26)

[internetional]

amount of fee increment (if it violates minimum increase in fees or not)

How big is this minimum? May I add extra 0.01 SAT/vByte to replace an old transaction with a new one?

[ranochigo]

How big is this minimum? May I add extra 0.01 SAT/vByte to replace an old transaction with a new one?

Nope, minimally equivalent to the minrelaytxfee that the nodes are using. Currently, by default reference implementation uses 1sat/vbyte as the mintxrelayfee rate. Hence, assuming that the majority of the nodes are adopting this, you need to at least pay an extra 1sat/vbyte for the RBF to work.

Note that this assumes that none of the parameters are changed and only guarantees good propagation. The miners are able to define their own parameters to allow for RBF.