Topic: Muun RBF attack on Small Amounts (Worked for 2000 sats) for 0 Confirmations (Read 73 times)

Since version 24.0 of Bitcoin Core I suspect, you can use Electrum and 2 phones with Muun wallet on each. Follow instructions below:

Make sure mempool.space website have transactions greater than 3 sats/vB for candidate blocks.

From Electrum, send max sats at 2 sats/vB on Electrum to a disposable Muun wallet from native segwit (from Electrum) to taproot address (on Muun) via Bitcoin network (bc1q... to bc1p...). Call this Muun Wallet A

As soon as Muun Wallet A receives fund, send funds to another Muun wallet (let us name it Muun Wallet B) via taproot again (bc1p.. to bc1p...) at 1 sat/vB.

As soon as Muun Wallet B receives fund, send to new Electrum address via native segwit address (bc1q....) according to optimal fee on mempool space website.

Open Electrum on PC and cancel original transaction (double spend) at 3 sats/vB or recommended fee.

Wait for confirmation of transaction from Muun to Electrum transaction.

Delete data (clear data of app) on Muun Wallet A app on Android phone. Muun wallet B can be kept (the one signed in). For iPhone, delete wallet, close app. (Muun Wallet A on Android; Muun Wallet B on iPhone)

Repeat step 1.

More info at: https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2022-October/020980.html

Muun trusts you with zero-conf transactions with small amounts, but with larger amounts they’ll make you wait for a confirmation.

Why not just wait for confirmations, even with small amounts?

Also, why do they subsidize your on-chain fees? Is it a feasible business plan? What's their 0 conf bitcoin amount limit?


Devices:              [PC]              [ANDROID]              [IPHONE]
APP INSTALLED:    [ELECTRUM]    [MUUN]                  [MUUN]