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1  Bitcoin / Electrum / Re: Canceling a transaction on: December 03, 2022, 03:46:07 PM
For my general development. What else do wallets exist that have an cancellation option?
I apologise for the off-topic question.
Not an off-topic question.

hosseinimr93 has already provided you with one of the wallets canceling unconfirmed bitcoin transaction can be possible which is Bluewallet:

Fee & Transactions control

Provides you a fee estimation targeting confirmations in 10m, 3h or 1 day. With real time calculation on how much to spend. Ability to Bump and Cancel sent transactions with "Replace-by-fee" (RBF) or with "Child-pays-for-parent" (CPFP).

Also you should be able to calcel an unconfirmed bitcoin transaction on Trezor Suite:

The "Speed up" and "Cancel" buttons can be found below the pending transaction in the "Activity" tab. Remember, you need to pay a fee (gas) to be able to speed up or cancel a transaction.

What does this mean?
"Provides you a fee estimation targeting confirmations in 10m, 3h or 1 day. With real time calculation on how much to spend. Ability to Bump and Cancel sent transactions with "Replace-by-fee" (RBF) or with "Child-pays-for-parent" (CPFP)."

Do I always have at least 10 minutes, 3 hours or 1 day to cancel the transaction?
2  Bitcoin / Electrum / Re: Canceling a transaction on: December 03, 2022, 06:11:14 AM
That is true as OmegaStarScream has already posted about it, but you should know that the transaction would be replaced with a new one with a higher fee and the coin would be sent to an address that belong to you, it also a replace-by-fee transaction just like to pump a transaction with a higher fee.

To be able to do that, you can use wallet like Electrum.

For my general development. What else do wallets exist that have an cancellation option?
I apologise for the off-topic question.
3  Bitcoin / Electrum / Re: Canceling a transaction on: December 02, 2022, 04:13:12 PM
I haven't used the wallet before, but I've heard that when you send bitcoins the transaction can be cancelled for a short time.
It mainly depends on the setting: "Tools->Preferences->Transactions->Use Replace-By-Fee".
If it's disabled, the option "cancel (double-spend)" wont show up in the unconfirmed transaction's right-click menu.

On a side note, that behavior might change depending on the Electrum servers and bitcoin node users' decision on "Full RBF" which is already available in the latest version of Bitcoin Core.
If most Bitcoin Core nodes enable the option mempoolfullrbf=1 (which is disable by default), the Electrum setting above wont be necessary.
I use a mobile app. How do I enable it there?
4  Bitcoin / Electrum / Re: Canceling a transaction on: December 01, 2022, 05:49:23 PM
You can do that as long as your transaction is unconfirmed. Canceling = replacing your old transaction with a new one that sends the funds back to your address.

Confirmed by the system or by the client?
And how long does it take to confirm?
Thank you in advance!
5  Bitcoin / Electrum / Canceling a transaction on: December 01, 2022, 05:17:06 PM
I haven't used the wallet before, but I've heard that when you send bitcoins the transaction can be cancelled for a short time.
Is this really the case?
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