Hi Insiders. This is Tuma, open-source reporter from the Insider Edition.
In this week update we feature an upgrade in the Fedimint-based wallet, Ecash App, introducing NFC support for better payment UX.
We also cover the recent effort from Stratum V2 maintainers to publish the new UI dashboard, sv2-ui, to the Umbrel app store, for a smoother self-hosting experience.
We finally cover two recent BIPs being published, namely BIP449 and BIP450, the recent move to Complete status for BIP54, and the latest release from Sparrow Wallet integrating silent payments.
Highlights from the bitcoin developer ecosystem
I spent 10+ hours in open-source developer calls in the Bitcoin ecosystem last week. Here is what caught my eye:
PR447 in the Ecash App added support for NFC payments.
During the weekly call, on Monday 18th, Fedimint developers discussed the ongoing work on Ecash App, the Fedimint-based wallet. In particular, they announced the recent merging of PR447, which introduces NFC support.
Specifically, PR447 adds support for receiving and transmitting Lightning invoices through NFC, allowing a user to pick up the invoice by simply “tapping” the device that generated it.
What is cool about the tech: NFC support improves the user experience for payments, following the footsteps of other projects in the ecosystem, such as Numo, in providing a familiar feel with everyday fiat payments.
IS80 in sv2-ui is keeping track of the work needed to publish the mining dashboard as an Umbrel app.
During the weekly call, on Tuesday 19th, Stratum V2 contributors discussed the ongoing effort to publish the new mining dashboard to the Umbrel app store. There are still active issues to be addressed before publishing, but the app is already undergoing a first round of testing.
sv2-ui is a sef-hostable dashboard that provides real-time statistics on miners, like connection status, total hashrate from connected miners, and shares sent to pools.
What is cool about the tech: Publishing the dashboard as an application on UmbrelOS would allow user to one-click deploy it, allowing for a smoother self-hosting experience.
A BIPs Update
In the last days there was some movement in the BIP repository. Specifically, two new BIP have been published by BIP maintainer Murchandamus.
Published BIPs
A list of recently published BIPs
BIP450: Formosa — Seed encoding by themed mnemonic stories
Authors: Yuri S. Villas Boas, André Fidencio Gonçalves
Published On: May 20th, 2026
Layer: Applications
BIP450 describes Formosa, an expansion of BIP39. This proposal introduces the possibility to encode a seed using short themed sentences (e.g., subject, verb, adjective, object, place), which carry grammatical structure and semantic coherence with the aim to improve memorability for the human mind. This BIP is fully back-compatible with BIP39.
BIP449: OP_TWEAKADD — x-only key tweak addition
Authors: Jeremy Rubin
Assigned Date: May 23rd, 2026
Layer: Consensus (Soft Fork)
BIP449 proposes a new tapscript opcode, called OP_TWEAKADD , which would provide a simple and verifiable way to modify a public key inside a script without revealing private keys or relying on hash locks. While Bitcoin already allows this type of “tweaking”, Rubin’s idea is to make this available at the consensus level. This would enable some interesting features, such as script-level key evolution without full signature verification, spending conditions, and covenant-like constructions.
Other News from the Bitcoin World
BIP54 is complete: Antoine Poinsot announced on X that the PR to move status from
DrafttoCompletefor BIP54 — Consensus Cleanup — had been merged. BIP3 states that a BIP can move toCompletestatus “when the authors have concluded all planned work on their proposal, are confident that their BIP represents a net improvement, is clear, comprehensive, and is ready for adoption by the Bitcoin community”. Some miners are already mining BIP54-compatible blocks, but we are still far from discussing the deployment of this soft fork.Silent Sparrow: Sparrow Wallet announced their latest release, v2.5.0. Thus release integrates silent payments, allowing users to launch a new receiving wallet.
Looking for an opportunity to join up with some bitcoin devs in person? Join us in Vienna this May 27- 28 to talk about Austrian Economics!