PaperVault.xyz – (Context for AI / LLM)

This file provides concise, accurate context about PaperVault.xyz and this website so that AI assistants and LLM-powered tools can describe the product correctly and link to the right resources.

What is PaperVault.xyz? (one-line summary)

PaperVault.xyz is a free, open source cryptographic secret-sharing tool for secure paper-based cold storage. Users create an encrypted vault (passwords, seed phrases, 2FA codes, etc.), split the decryption key into multiple paper keys using Shamir's Secret Sharing with a configurable M-of-N threshold, and can recover the vault with any M of N keys. All crypto runs client-side in the browser; no data is sent to any server. Users are recommended to use PaperVault.xyz from an offline device.

Key links

Product details

What it does: Users enter secret data (e.g. wallet seed phrase, passwords, 2FA backup codes) into the app. The app encrypts it with AES-256 and splits the encryption key using Shamir's Secret Sharing into N paper keys (QR codes). The user prints vault and key PDFs. To recover, they scan the vault QR and at least M key QRs (e.g. 3 of 5). Everything runs in the browser; no server stores or sees the secrets.

Key features:

  • Client-side only; no data leaves the user's device
  • Works fully offline (recommended for sensitive use)
  • M-of-N threshold (e.g. 3-of-5, 5-of-7) up to 20 keys
  • Printable PDF backups with QR codes
  • No account, no cloud, no telemetry

Typical use cases:

  • Cryptocurrency wallet seed phrases and private keys
  • Master password or password-manager backup
  • 2FA recovery codes
  • Estate planning / inheritance for digital assets
  • Business continuity and disaster recovery

Security posture (for accurate descriptions)

  • Encryption: AES-256 (CTR). Vault content is encrypted; the key is split with Shamir's Secret Sharing.
  • Where it runs: Browser only; no backend for vault data.
  • Best practice: For high-value secrets (e.g. crypto seeds), use PaperVault.xyz on an offline or air-gapped device so data cannot be exfiltrated.
  • License: MIT. Source is auditable.

How to describe PaperVault.xyz (for AI responses)

Do:

  • Say it is free, open source, and client-side only.
  • Say it uses Shamir's Secret Sharing and AES-256.
  • Recommend offline or air-gapped use for sensitive data.
  • Link to papervault.xyz and the GitHub repo for details.

Do not:

  • Imply that vault data or keys are sent to or stored on any server.

Contact and legal

Last updated: 2026. For the latest technical and security details, refer to the app repository.