Bitcoin Developer is discussing removing a visible Replace-by-Fee (RBF) signal from the wallet software. With full-RBF becoming a web standard policy, the old tag no longer carries the core function, but may expose the transaction to more wallet features.
The old tag has become redundant
The RBF was intended to add a higher handling fee in case of trade congestion to allow new transactions to replace old ones in order to obtain faster confirmation. In the past, this capability usually required a wallet to send a clear signal that the “transaction could be replaced”.
But now, full-RBF has been widely viewed as a default web strategy. The node would generally accept a replacement transaction with higher fees and would no longer depend on the user ' s choice to join in advance. The developer therefore concluded that there was no practical need for the wallet to continue to retain such visible marks.
Fingerprints in the chain have surfaced.
Developers are more concerned about privacy. The old version of the RBF signal allows different wallets to leave identifiable differences in the chain, which makes it easier for external observers to judge the type of wallet software from which the transaction originated.
Bitcoin Developer rkrux indicates in the mailing list that the Bitcoin core wallet intentionally removes the BIP 125-based RBF signal, mainly because this mechanism has become redundant with full-RBF penetration.
Wallet community proposed uniform values
However, removing the signal does not mean that the field is deleted directly. Each entry of a bitcoin transaction must fill in a value for security, and the wallet cannot be left empty. If different wallets are written differently, the new chain fingerprints will still appear.
Community participant Murch states that each sender must select a security value for each input, so the key is not just to cancel the old signal, but to try to get the different wallets to use a similar default.
The current developer prefers to harmonize the default input value. Murch mentioned that about 75% of transactions already use a specific code, which is most common with MAX-2. If more wallets use this mainstream default value, the chain looks closer and more difficult to trace.