Satsigner

https://twitter.com/pedromvpg/status/1553123963139756032

Why work on this?

• Help build a powerful native mobile Bitcoin signer management application
• Contribute towards the integration, development and enhancement of Bitcoin UX design
• Unlock coin insights via integrated onchain (privacy/provenance/economic) analyses and corresponding data visualisation to help inform, encourage and automate better Bitcoin usage best-pratices
• Advance Bitcoin understanding
• Test market demand for bitcoin centric applications
• Propagate open-source ethos
• Build and support Bitcoin and related FOSS projects
• Participate in Bitcoin history

Ethos/priorities/design philosophy

• Bitcoin only
• Sat denomination supremacy
• Initial focus on on-chain bitcoin (coin-control/controlling sats)
• Emphasis on privacy
• Emphasis on personal labeling, tagging, and bookmarking
• Application of visualisation/visual-native UI aiming to build upon and develop new Bitcoin design primitives to help make more advanced/poower-user Bitcoin UX/UI more intuitive and accessible
• Take advantage of appropriate charts and graphic layouts for all data vizualisation
• Security - targetting optimal hot-signer-level security initially (future support for watch-only cold, multisig, vaults etc)
• Visually crafted and UX builds upon powerful feattures and improvements introoduced by the many existing brilliant open-soouurce FullyNoded, or Sparrow
• An intuitive and powerful mobile bitcoin app

Features

Main features and goals

• Experimental bitcoin centric lexicon
  • Send bitcoin -> Sign bitcoin messages
  • Spend bitcoin -> Consume UTXO
  • Bitcoin balance -> Total spendable sats
  • Wallet -> Signer
  • Private key -> Account
  • Address -> Invoice
  • Transaction -> Message
  • (...)
• Bitcoin specific UX patterns
• Bitcoin technology education
• Visual personal chain analysis
• UTXO control
• Fully open source
• Easily reproducible
• Open source dependencies only
• Bitcoin interface exclusively via open source library

Forward looking ambitions

• Mobile collaborative transaction interface (mobile joinmarket client?)
• Native lightning support built with LDK (keeping with UX/Data visual-focus)

Stack

Possible dependencies

Backend

• [Bitcoin Development Kit] (https://github.com/bitcoindevkit) via [RN-BDK] (https://github.com/LtbLightning/bdk-rn) - becoming reference Bitcoin dev tools
• [Electrum Server] (https://github.com/spesmilo/electrum-server) - ubiquitous node interface
• [Photon SDK] (https://github.com/photon-sdk) - powerful mobile Bitcoin dev kit to build forgiving, easy backup and recovery, intuitive signers

Frontend

• [React bubble chart] (https://www.npmjs.com/package/react-bubble-chart)
• [React d3 tree] (https://github.com/bkrem/react-d3-tree)

Design/product inspiration + revered FOSS projects

• [Sparrow] (https://github.com/sparrowwallet/sparrow) - very powerful and clean native Bitcoin signer management desktop app
• [FullyNoded] (https://github.com/Fonta1n3/FullyNoded) - very powerful iOS app focused on remote full node management
• [BitFeed] (https://github.com/bitfeed-project/bitfeed) - beautiful, psychedelic block/transaction/timechain visualisation
• [Mempool.space] (https://github.com/mempool/mempool) - beautiful block explorer and Bitcoin data visualisations
• [Zeus] (https://github.com/ZeusLN/zeus) - pretty, increasingly powerful remote LN node management app

UI

Concepts

UTXO selection

Security

Verification

UTXO consumption