How to make transaction never gets confirmed?

[garlonicon]

How would you know rule of each mining pool? I expect black-box testing would take some time and decent amount of money.

Unless it is some test network. Or a separate chain, that is committed to Bitcoin every sometimes, to get it timestamped by Proof of Work. There is no reason to create spam on-chain if there are cheaper alternatives.

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[death_wish]

It is not for scam but spam, I want to touch some fellows without a need to pay for it

I am unsure of whether I should be impressed at the twisted honesty (“I’m not trying to steal money, but only to abuse network resources!”), or appalled at the audacity.

It reminds me of an historical case in which a robber sued another robber for breach of contract.  The plaintiff alleged that he and the defendant had agreed to divide the proceeds of literal highway robbery, but the defendant had taken more than his agreed share of stolen goods.  The court tossed the case, and sanctioned the plaintiff’s attorney for frivolous litigation with a penalty of £50 (then a significant sum).  This occurred a few hundred years ago, in the U.K.  Details are stated from my recollection; alas, I cannot now find the reference.  If anyone could provide it, it would make a suitable addition to this thread.

Is there any Bitcoin wallet that allows you send transaction with low fees that miners will not ever confirm it?
I need send a transaction to a BTC address and I want this transaction displayed on blockchain but must never gets confirmed.
Is this possible? Is there any wallet that allows this?

No.

[hosseinimr93]

2. Miner on certain pool (don't remember which one) have privilege to include few specific transaction.

You are probably referring to F2Pool. They allow their miners to submit a transaction, so it is included in the next block mined by them.
I doubt there's any other pool doing the same thing.

[garlonicon]

What cheaper alternative do you have in mind?

1) Creating a separate chain to reach P2P Messaging System is cheaper.
2) Creating OP_RETURN commitments is cheaper.
3) Creating OP_RETURN commitments as a branch inside TapScript is even cheaper, the same with tweaking signatures in the same way as in Taproot is cheaper.
4) Sending messages on any test network instead of mainnet is cheaper (by the way, test coins are considered worthless, so sending public messages is the only reason why test networks are needed at all).
5) Using no chain at all is cheaper (and then, things can be always committed and timestamped by Bitcoin Proof of Work when needed).

[Cryptornd]

after the submiting to the pool that transaction will be finalized . can be late but cannot be unconfirmed forever my friend

[seoincorporation]

Hello garlonicon.

The only way to broadcast a transaction and avoid it getting confirmed is by double-spend the transaction to a new address. The double-spend should be done before the transaction gets confirmed.

This is like playing with fire and there is a risk lose your coins by failing with the double spend. But this is the only way to do it allowed by the nature of Blockchain.

[pooya87]

after the submiting to the pool that transaction will be finalized . can be late but cannot be unconfirmed forever my friend

Transactions are only "finalized" if they are confirmed which means if they are included in a block. Otherwise as long as they are unconfirmed and reside in the memory pool they can be dropped or invalidated (double spent).