bitlogin/docs

BitLogin Documentation

BitLogin is a static, relay-backed portable account protocol that gives users a familiar login name and password while preserving a user-controlled Nostr identity and independent phrase recovery.

This directory contains the core protocol specification, implementation notes, and experimental designs for expanding BitLogin into a portable account layer for compatible applications.

Core protocol

• spec.md — canonical BitLogin protocol specification
• second-factor.md — second-factor design notes
• login-methods.md — the widget as the single login surface: NIP-07 and NIP-46 sign-in behind the existing provider facade (implemented; nsec-paste login rejected on the record)
• passkey-login.md — passkey sign-in via the WebAuthn PRF extension (implemented): zero registration, zero servers, a frozen derivation contract, and the graduation ladder to self-custody
• centralized-onramps.md — superseded, kept on the record: the OAuth on-ramp designs (external service, serverless Google Drive) and the analysis of why OAuth cannot be static without per-site provider registration — the requirement that led to the passkey rail

Portable account layer

These documents describe proposed capabilities that build on BitLogin's core identity and recovery model.

• account-switching.md — multiple independent accounts on one device, fast switching, locking, logout, and account-aware signer behavior
• portable-app-state.md — encrypted, user-owned application settings and lightweight state that follow the account across devices
• portable-entitlements.md — discovery, verification, recovery, and presentation of purchases, licenses, memberships, and access rights
• relay-and-messaging-portability.md — relay-role management, DM inbox and outbox synchronization, sent-message recovery, and conversation reconstruction

Connection Vault

The Connection Vault stores portable application credentials outside the core identity capsules as independently encrypted records. Its protocol layer (records, key hierarchy, relay sync, migration, tiers) is implemented in @bitlogin/core's src/vault/; the widget authorization layer shipped 2026-07-30 in REVEAL mode (requestNwcConnection, offerNwcConnection, and a Wallet-connections screen). Durable per-origin grants and a Connected-apps page are still to come; see connection-vault.md §19 for the open limitations.

• connection-vault.md — overall vault architecture, key hierarchy, relay storage, authorization, recovery, and deletion; §18 records the implementation-time decisions (tier model, sudo key)
• vault-ux.md — the agreed user-experience walkthroughs, serving as the authorization layer's acceptance criteria
• nwc-connections.md — Nostr Wallet Connect credential profile (parser/exporter implemented in src/vault/nwc.ts)
• s3c-format.md — portable s3c1: format for S3-compatible storage connections

How the pieces fit together

BitLogin account
├── Identity and recovery
│   ├── Credential capsule
│   ├── Recovery capsule
│   └── Everyday Nostr identity
│
├── Accounts and sessions
│   └── Multiple-account switching
│
├── Communication
│   ├── Relay preferences
│   ├── DM inbox synchronization
│   ├── DM outbox and sent-message recovery
│   └── Conversation reconstruction
│
├── Portable application experience
│   ├── App settings
│   ├── Saved state
│   └── Per-app authorization
│
├── Ownership
│   ├── Purchases
│   ├── Licenses
│   ├── Memberships
│   └── Access entitlements
│
└── Connection Vault
    ├── NWC wallet connections
    ├── S3-compatible storage connections
    └── Future service credentials

Status terminology

Documents use these labels:

• Implemented — available in the current codebase
• Partially implemented — some required primitives or flows exist, but the complete user-facing feature does not
• Experimental design — documented for review and future implementation; wire formats and APIs may change

Experimental documents are not part of the stable BitLogin protocol until their schemas, security properties, migrations, and test vectors are finalized.

Recommended product sequence

A practical development sequence is:

1. Complete the core account and messaging foundations.
2. Add independent multi-account sessions and switching.
3. Add relay management, inbox synchronization, and sent-message recovery.
4. Add portable application state and per-app permissions.
5. Add entitlement discovery and a portable ownership library.
6. Implement the Connection Vault and its NWC and S3 profiles.
7. Move high-value authorization into stronger extension, native, or cross-origin execution boundaries.

Design principle

BitLogin should coordinate portable identity, state, ownership, and service access without becoming the centralized custodian of the user's identity, money, files, messages, or purchases.