Blockcore Notes

github.com/block-core/blockcore-notes Nostr Open-source projectOpen source

Blockcore Notes stores public and personal notes on decentralized infrastructure using Nostr.

github.com/block-core/blockcore-notes
Blockcore Notes homepage screenshot

About Blockcore Notes

Blockcore Notes is an open source notes app for public and personal notes, built to work with Nostr. It uses your Nostr identity, which is a public key, and a set of relays to publish and store notes. The source states that you can run your own personal relay to keep a backup of your notes.

The app requires a separate browser extension that keeps your keys secure, signs your notes, and encrypts and decrypts private notes. The source suggests Blockcore Wallet and mentions nos2x and Alby as other options. The project lists support for a set of Nostr NIPs, including NIP-04 encrypted direct messages and NIP-07 browser signing, and describes a goal of going beyond the NIP specifications.

Key features

  • Encrypts and decrypts private notes through a browser extension
  • Optional personal relay that keeps a backup of your notes
  • Import and export of backups as a JSON file
  • Import and export of contacts published to relays
  • Advanced relay management, activity feed and thread view
  • Rich media playback for videos, music, podcasts and YouTube
Best for: Nostr users who want to save public and personal notes and manage their keys through a browser extension.
Good for
  • Source code is public in an open source repository
  • Supports running a personal relay to keep a backup of notes
  • Works with several browser extensions for key management, including Blockcore Wallet, nos2x and Alby
Watch out for
  • Requires a separate browser extension to keep keys and sign notes
  • Pricing is not stated in the source

Blockcore Notes at a glance

Type
Open-source project
Pricing
Not confirmed. Check the site
Platforms
Browser extension
Open source
Yes · Source code
Language
English
Last checked
Oct 6, 2026 · Online when checked
Listed
Oct 5, 2026

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Blockcore Notes FAQ

Do I need a browser extension to use Blockcore Notes?
Yes. The source says the app requires an extension that keeps your keys secure, signs your notes, and encrypts and decrypts private notes.
How can I keep a backup of my notes?
The source says you can run your own personal relay to keep a backup of your notes. Backups can also be exported and imported as a JSON file.
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