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Ledger

Self-hosted personal finance · React PWA · Plaid · Google SSO · zero-knowledge at-rest encryption · Docker Compose deploy

Copyright © 2026 Jack Jewell and contributors · Source: https://github.com/JKJWL/Ledger · License: AGPL v3 (see LICENSE, third-party acknowledgements in NOTICE) · Security policy: SECURITY.md

A self-hosted personal-finance app for one person (or a small household). Bank sync via Plaid, transactions stored encrypted on your own server, mobile PWA you can install on your phone. AGPL, no telemetry, no ads.

A note on the license

Ledger is licensed under the GNU Affero General Public License v3.0. That means:

  • Personal / household use: do whatever you want with it. Run it, modify it, share it with friends.
  • Forking + modifying: encouraged. Your fork is still AGPL.
  • Running it as a paid service for other people (SaaS, multi-tenant hosting, anything where someone pays to access your instance): the AGPL's network-use clause triggers, and you must release your modifications to the source code (including any private patches) under AGPL too. This is by design — the project is for individuals to self-host, not for corporations to repackage and resell.

If AGPL doesn't work for your use case (e.g. you want to fork commercially without sharing your changes), please reach out and we can discuss.

A note on security

This is a self-hosted app for personal use. You are the operator of your deployment, which means you are responsible for keeping your VPS patched, your SSH hardened, your firewall correct, and your secret keys backed up off-server. The application ships with sensible security defaults (allowlist-only sign-in, strict CSP, AES-256-GCM for tokens and notes, no client-side caching, rate-limiting, prepared statements only, etc.) but those defaults can only protect you if the layer underneath is sound. Read SECURITY.md before you deploy.

To report a security vulnerability in the code (as opposed to your specific deployment), please follow the process in SECURITY.mddo not open a public GitHub issue.


Features

Accounts & transactions

  • Bank sync — connect any institution Plaid supports (most US banks, brokerages, credit unions). Polls Plaid on a configurable interval (default every 60 min, tunable via SYNC_INTERVAL_MINUTES), plus webhook-driven near-real-time updates when your bank pushes them.
  • Pending transactions — when your bank reports a charge as pending, it shows up immediately with an amber "Pending" badge so you can tell authorized-but-not-yet-settled spending apart from posted activity.
  • Manual accounts — for banks Plaid doesn't support; balances auto-adjust when you record transactions.
  • Transactions — date-grouped activity feed with filter by account / category, sort options, tap-to-edit.
  • Per-merchant rules — recategorise a transaction and choose "all future from this merchant"; the rule is saved per-user and applied to every subsequent sync.

Budgets

  • Master period — one reset rhythm drives every budget AND the credit-usage tracker. Pick a cadence on the Income card (weekly, bi-weekly, semi-monthly, monthly, yearly, or every N days from a date) and "this week's groceries", "this week's income", and "this week's allocation total" all line up exactly.
  • Two budget types — category-based (default) or credit-card-account-based; credit-card transactions are excluded from category budgets to avoid double-counting (swipe + payment).
  • Drag to reorder — touch and mouse both work; order persists across devices. A lock toggle prevents accidental drags on mobile.
  • Edit any budget — amount editable after creation. Category and account are locked once a budget is created (use delete + recreate if you need to change either).
  • Budget history — a date dropdown next to "+ New Budget" walks back through past periods (the last 12 by default). Each period shows what you actually budgeted vs spent AT THAT TIME — amount edits or deletions made later don't rewrite history. Backed by a budget_audit table that snapshots every create / update / delete event.
  • Suggested categories — new-budget form suggests categories you spend on but haven't budgeted yet.
  • Income tracker — pinned at top, no limit; sums positive transactions over the master period.
  • Credit usage tracker — only appears when a credit account is linked; per-card breakdown, also master-period bound.
  • Zero-based-budget summary — dual-color bar at the bottom showing income vs allocated, with "X left to budget" indicator.
  • Themed confirmations — destructive actions (delete budget, etc.) prompt with an in-app modal, not the native browser dialog.

Goals

  • Savings goals with target / progress
  • Contribute button + quick-add chips ($25 / $50 / $100 / $250 / $500)

Net worth

  • Net Worth chart with WTD / MTD / YTD / 1M / 3M / 1Y / ALL toggle (mobile gradient hero + desktop full chart)
  • Spending pulse — compact monthly category breakdown card

Investments

  • Holdings, gains/losses — brokerage syncing via Plaid

Misc

  • Notes — free-form notes, content encrypted at rest
  • Mobile PWA — install to iPhone home screen, full-screen, frosted iOS-style nav, Dynamic Island safe
  • Multi-device — your dark mode, settings, and data sync between devices
  • Google SSO — no passwords stored; locked to an email allowlist so only you can sign in

Stack

Layer Tech
Backend Node.js 20, Fastify, MariaDB 11, BullMQ + Redis, Plaid
Frontend React 18, Vite, Tailwind, Framer Motion, Recharts
Auth Google Sign-In (ID-token verification, no client secret needed)
Encryption AES-256-GCM for Plaid access tokens + note content
Infra Docker Compose (5 services)
Reverse proxy Caddy with auto-HTTPS (Let's Encrypt) — recommended

Quick start (local development)

Prerequisites

  • Docker + Docker Compose
  • A Google Cloud OAuth 2.0 Client ID (see Google setup)
  • A Plaid account with sandbox keys, at minimum (see Plaid setup)
  • openssl for secret generation
  • bash for the bootstrap script (Linux/macOS, or WSL/Git Bash on Windows)

1. Clone and bootstrap

git clone https://github.com/JKJWL/Ledger.git ledger
cd ledger
./bootstrap.sh

bootstrap.sh will:

  • Generate cryptographically-random secrets (JWT, encryption key, DB passwords)
  • Prompt you for your Gmail address, Google Client ID, Plaid Client ID, and Plaid Secret
  • Write a properly-permissioned .env (chmod 600)
  • Print your ENCRYPTION_KEY once — save it in a password manager. If you lose this key, all Plaid access tokens and encrypted note content become unrecoverable.

2. Build and start

docker compose build
docker compose up -d

3. Run database migrations

docker compose exec backend npm run migrate

This creates all tables. Idempotent — safe to re-run after upgrades.

4. Sign in

Open http://localhost:8080 (or whatever you've configured), click Continue with Google, and sign in with the email you whitelisted. The first sign-in automatically promotes you to admin.


Production deployment (Linode / any Ubuntu VPS)

This guide assumes Ubuntu 24.04 LTS. Adapt as needed for other distros.

1. Server prep

Pick a non-root username — anything other than ledger, admin, ubuntu, or any other word someone could guess from the project name or distro defaults. We'll refer to it as <your-user> throughout the rest of this guide; substitute your actual choice. (Yes, your SSH key auth defeats brute force on its own — but the less an attacker can guess about your setup, the fewer free attempts they get.)

# As root, replace <your-user> with whatever username you picked.
adduser <your-user>
usermod -aG sudo <your-user>
mkdir -p /home/<your-user>/.ssh
cp ~/.ssh/authorized_keys /home/<your-user>/.ssh/
chown -R <your-user>:<your-user> /home/<your-user>/.ssh
chmod 700 /home/<your-user>/.ssh
chmod 600 /home/<your-user>/.ssh/authorized_keys

Log out, log back in as <your-user>, confirm sudo works.

2. Lock down SSH

sudo nano /etc/ssh/sshd_config:

PermitRootLogin no
PasswordAuthentication no
PubkeyAuthentication yes
MaxAuthTries 3
ClientAliveInterval 300
ClientAliveCountMax 2

sudo systemctl restart ssh

3. Firewall

sudo ufw default deny incoming
sudo ufw default allow outgoing
sudo ufw allow 22/tcp     # consider restricting to your IP
sudo ufw allow 80/tcp
sudo ufw allow 443/tcp
sudo ufw enable

If your VPS has its own cloud firewall (Linode, AWS, DigitalOcean, etc.), make sure to also open 80 and 443 there. UFW won't help if the cloud firewall blocks traffic first.

4. fail2ban + auto-updates

sudo apt install -y fail2ban unattended-upgrades
sudo systemctl enable --now fail2ban
sudo dpkg-reconfigure --priority=low unattended-upgrades

5. Docker

curl -fsSL https://get.docker.com | sudo sh
sudo usermod -aG docker $USER
# log out / back in

6. Caddy reverse proxy with auto-HTTPS

sudo apt install -y debian-keyring debian-archive-keyring apt-transport-https curl
curl -1sLf 'https://dl.cloudsmith.io/public/caddy/stable/gpg.key' \
  | sudo gpg --dearmor -o /usr/share/keyrings/caddy-stable-archive-keyring.gpg
curl -1sLf 'https://dl.cloudsmith.io/public/caddy/stable/debian.deb.txt' \
  | sudo tee /etc/apt/sources.list.d/caddy-stable.list
sudo apt update && sudo apt install -y caddy

Configure sudo nano /etc/caddy/Caddyfile:

ledger.your-domain.com {
    encode gzip
    reverse_proxy 127.0.0.1:8080
    tls {
        issuer acme {
            disable_tlsalpn_challenge
        }
    }
}

The disable_tlsalpn_challenge line forces Caddy to use HTTP-01 instead of TLS-ALPN-01. This works reliably even behind Cloudflare or other proxies.

Point your domain's A record at the server's public IP, then:

sudo systemctl reload caddy
sudo journalctl -u caddy -f    # watch the cert issue

You should see "certificate obtained successfully" within a minute.

7. Clone and deploy the app

Substitute <your-user> with whatever username you created in step 1, and <your-domain> with whatever domain you'll be serving from.

cd ~                # your-user's home directory
git clone https://github.com/JKJWL/Ledger.git ledger
cd ledger
./bootstrap.sh      # prompts for domain, Google ID, Plaid keys, etc.
docker compose build
docker compose up -d
docker compose exec backend npm run migrate

Visit https://<your-domain> and sign in.

8. Encrypted nightly backups

The example below assumes you keep backups under your user's home directory. Substitute <your-user> (and the project path if you cloned somewhere else).

sudo nano /etc/cron.daily/ledger-backup
#!/bin/bash
set -e
# Adjust these two paths to match your install.
APP_DIR=/home/<your-user>/ledger
BACKUP_DIR=/home/<your-user>/backups
KEY_FILE=/home/<your-user>/.backup-key

mkdir -p "$BACKUP_DIR"
TS=$(date +%Y%m%d-%H%M%S)
source "$APP_DIR/.env"
docker exec ledger-db mysqldump -uroot -p"$DB_ROOT_PASSWORD" --all-databases \
  | gzip \
  | openssl enc -aes-256-cbc -salt -pbkdf2 -pass file:"$KEY_FILE" \
  > "$BACKUP_DIR/ledger-$TS.sql.gz.enc"
find "$BACKUP_DIR" -name "ledger-*.sql.gz.enc" -mtime +14 -delete
sudo chmod +x /etc/cron.daily/ledger-backup
openssl rand -hex 32 | sudo tee /home/<your-user>/.backup-key
sudo chmod 400 /home/<your-user>/.backup-key

Keep a copy of .backup-key off-server (password manager, encrypted USB, etc.). Periodically rsync the backup directory to another host or to S3. To restore:

openssl enc -d -aes-256-cbc -pbkdf2 -pass file:.backup-key \
  -in ledger-YYYYMMDD-HHMMSS.sql.gz.enc | gunzip | mysql -uroot -p

Google Cloud OAuth setup

  1. Create a project: https://console.cloud.google.com → "Select a project" → "New Project" → name it Ledger.

  2. Configure consent screen: APIs & Services → OAuth consent screen

    • User type: External (Internal only if you have Workspace)
    • App name: Ledger
    • User support email, developer contact: your email
    • Skip scopes (OpenID/email/profile included by default)
    • Add your Gmail under Test users (so you can sign in before publishing)
  3. Create OAuth Client ID: APIs & Services → Credentials → Create Credentials → OAuth client ID

    • Application type: Web application
    • Name: Ledger Web
    • Authorized JavaScript origins:
      • http://localhost:8080 (for local dev)
      • https://ledger.your-domain.com (for production)
    • Authorized redirect URIs: leave empty (we use the ID-token flow, no redirect)
    • Click Create → copy the Client ID (looks like 123-abc.apps.googleusercontent.com)
  4. Put the Client ID in .env — bootstrap.sh prompts for this, but it goes in two variables with the same value:

    GOOGLE_CLIENT_ID=123-abc.apps.googleusercontent.com
    VITE_GOOGLE_CLIENT_ID=123-abc.apps.googleusercontent.com
    
  5. You never need the Client Secret — this app uses the ID-token verification flow which only needs the public Client ID. Leave the secret in the dashboard, unused. Never put it in .env or any client-side code.

  6. Once it's working, you can either:

    • Stay in Testing mode and add up to 100 test users (recommended for personal use)
    • Click Publish App to remove the warning and the user cap

Plaid setup

  1. Sign up at https://dashboard.plaid.com — sandbox is free.

  2. Get your keys: Team Settings → Keys → copy client_id and sandbox secret for local testing.

  3. Request production access when you're ready for real banks: Team Settings → request Production. They'll ask for use case ("Personal financial management"), products (Transactions, Investments — see Plaid products), privacy policy, and estimated volume.

  4. For OAuth banks (Chase, US Bank, most credit unions): add your production redirect URI under Team Settings → API → Allowed redirect URIs. Must match PLAID_REDIRECT_URI in .env character-for-character (including trailing slash).

  5. Webhooks (optional, for auto-sync push): set PLAID_WEBHOOK_URL=https://ledger.your-domain.com/api/plaid/webhook in .env. The endpoint is public but signature-verified by Plaid — safe to expose.

Which Plaid products

This app uses:

  • Transactions (required) — accounts, balances, transactions
  • Investments (optional, only added when the institution supports it) — holdings, gains/losses

Skip Auth, Identity, Liabilities, Income, Assets — they're not used here and Plaid charges per-product per-item.


Connecting non-Plaid banks

For institutions Plaid doesn't support (e.g., smaller credit unions):

  1. On mobile: Settings → Banks & Accounts → tap + Add under Manual Accounts.
  2. On desktop: Accounts tab → Add Manual button.
  3. Fill in name, institution, type, starting balance.
  4. Record transactions manually in Activity. Each transaction auto-updates the linked manual account's balance (income adds, expense subtracts). Plaid-linked accounts are never touched by manual entries.

Security

This app is designed to be exposed to the public internet safely.

  • Email allowlist (ALLOWED_EMAILS in .env) — only Google accounts on this comma-separated list can sign in. Anyone else gets a 403, regardless of whether Google would otherwise let them through.
  • Rate limiting — 200 req/min global, 10 req/min on /api/auth/google (blocks token-spray).
  • Helmet — HSTS, X-Frame-Options DENY, strict Referrer-Policy, no X-Powered-By.
  • Strict CORS — refuses to start in production if CORS_ORIGIN isn't set.
  • JWT 30-day expiration — sessions auto-expire; sign back in with one Google click.
  • Encryption at rest — Plaid access tokens and note content encrypted with AES-256-GCM.
  • Prepared statements — every DB query uses parameterized ? placeholders; no string concatenation, no SQL injection surface.
  • Error masking — production 5xx responses return a generic message; stack traces stay in logs.
  • Audit log — every sign-in (success and failure) recorded with IP and user agent.
  • Body limit — 512KB.
  • CSP — nginx serves a strict Content-Security-Policy locking script sources to self, Google, and Plaid.
  • No client-side caching — every response (HTML, JS, CSS, API, images) is served with Cache-Control: no-store, no-cache, must-revalidate. Cost is a tiny per-page-load bandwidth hit on a single-file React app; benefit is that security fixes and bug fixes propagate to every user the instant they navigate, with zero chance of a stale bundle masking a deployed fix. The login session lives in localStorage (not the HTTP cache), so you stay signed in despite the no-cache policy.

Operator responsibilities

This app ships with strong defaults but you, the self-hoster, are the system administrator. Reading SECURITY.md is recommended before you deploy. Short version:

  • Generate fresh secrets per environment — don't reuse dev secrets in production
  • Back up ENCRYPTION_KEY and .backup-key off-server (lose either and data is gone)
  • Restrict SSH to your home IP in the cloud firewall once everything works
  • Enable disk encryption at the VPS level (Linode supports this at provisioning time)
  • Keep the OS patched (unattended-upgrades covers most of it)
  • Review the SECURITY.md scope before reporting an issue, and report code-level vulnerabilities privately, never on a public issue.

Updating

Standard upgrade flow after git pull:

cd ~/ledger
git pull
docker compose build --no-cache backend frontend
docker compose up -d
docker compose exec backend npm run migrate

A few notes:

  • --no-cache is recommended on every upgrade. Docker's layer cache can silently reuse stale RUN npm install or RUN npm run build steps and ship you the wrong bundle. Caching what's actually safe to cache costs about 30 seconds of build time; not catching a stale layer costs hours of debugging.
  • npm run migrate is idempotent and safe to re-run after any pull. It uses CREATE TABLE IF NOT EXISTS and ALTER TABLE ... ADD COLUMN IF NOT EXISTS, so running it when nothing changed is a no-op. Just always run it.
  • Vite env vars are build-time. If you ever change VITE_GOOGLE_CLIENT_ID (or add new VITE_* vars), you MUST rebuild the frontend (--no-cache) — restarting the container alone won't pick the change up.
  • No client-side caching means no stale bundles — every navigation re-downloads the (small) JS bundle, so a hard refresh after deploy is unnecessary in practice. Your session in localStorage survives across reloads, deploys, and container rebuilds; you stay signed in.
  • Restart just the worker if you change SYNC_INTERVAL_MINUTES. The worker sweeps and re-registers BullMQ schedules at startup, so a docker compose up -d worker is enough; backend and frontend can stay up.

Troubleshooting

"Google Sign-In is not configured" on the auth screen

VITE_GOOGLE_CLIENT_ID isn't reaching the frontend bundle. Vite reads env vars at build time from build args — they must be passed through Docker. Confirm both:

  • .env has VITE_GOOGLE_CLIENT_ID=...
  • docker-compose.yml frontend args: includes VITE_GOOGLE_CLIENT_ID: ${VITE_GOOGLE_CLIENT_ID}

Then rebuild without cache: docker compose build --no-cache frontend.

In browser DevTools console: import.meta.env.VITE_GOOGLE_CLIENT_ID should return the full ID.

"Plaid doesn't support connections between [bank] and Ledger"

The institution doesn't support every product you're requesting. This app uses optional_products: ["investments"] so most banks should work. If you see this error for a bank that should work, check the backend logs:

docker compose logs --tail=100 backend | grep -i plaid

"Internal server error" after Google sign-in

Almost always: migrations haven't been run. docker compose exec backend npm run migrate.

Or: GOOGLE_CLIENT_ID is missing/wrong in the backend env. docker compose exec backend printenv GOOGLE_CLIENT_ID.

Caddy: "Timeout during connect" on certificate issue

Port 80 isn't reachable from the public internet. Check:

  • UFW: sudo ufw status | grep 80
  • Cloud firewall (Linode/AWS): make sure inbound 80/443 are open from 0.0.0.0/0

Caddy: "Cannot negotiate ALPN protocol acme-tls/1"

Something is intercepting port 443 — usually Cloudflare proxy. Either turn off the orange cloud in CF's DNS panel, or use the disable_tlsalpn_challenge Caddyfile config shown above.

Caddy: rate limit (HTTP 429)

Let's Encrypt allows 5 failed auths per hour per domain. Stop Caddy, fix the underlying issue, wait until the retry-after time, then start it again. Use their staging CA (acme_ca https://acme-staging-v02.api.letsencrypt.org/directory inside tls { ... }) to test setup changes without burning real-cert attempts.

Manual transactions don't update the account balance

Make sure the transaction is linked to an account (Account dropdown in the add form). Plaid-linked accounts are never adjusted by manual entries — their balances come from Plaid sync.


Project structure

ledger/
├── Backend/
│   ├── src/
│   │   ├── server.js           # Fastify entry, security middleware
│   │   ├── worker.js           # BullMQ worker (Plaid syncs, email)
│   │   ├── migrate.js          # Schema bootstrap + ALTER migrations
│   │   ├── db.js               # mysql2 pool (prepared statements only)
│   │   ├── crypto.js           # AES-256-GCM encrypt/decrypt
│   │   ├── audit.js            # Audit log helper
│   │   ├── plaid-client.js     # Plaid SDK init
│   │   ├── plaid-webhook-verify.js
│   │   ├── queue.js            # BullMQ queue/job helpers
│   │   ├── sync.js             # Plaid sync orchestration
│   │   ├── mailer.js           # SMTP / Nodemailer
│   │   └── routes/             # Fastify route plugins
│   ├── Dockerfile
│   └── package.json
├── Frontend/
│   ├── src/
│   │   ├── App.jsx             # The whole UI (single-file by design)
│   │   ├── main.jsx
│   │   ├── index.css           # Tailwind + iOS PWA reset
│   │   ├── api/client.js       # Thin fetch wrapper
│   │   ├── hooks/useAuth.js
│   │   └── context/DateContext.jsx  # Global data store
│   ├── public/manifest.webmanifest  # PWA manifest
│   ├── index.html              # PWA meta tags + Google GIS script
│   ├── nginx.conf              # Security headers, CSP, caching
│   ├── Dockerfile
│   ├── tailwind.config.js
│   ├── vite.config.js
│   └── package.json
├── docker-compose.yml          # 5 services: mariadb, redis, backend, worker, frontend
├── bootstrap.sh                # First-time .env generator
├── .env.example                # Template — actual .env is git-ignored
└── README.md

Environment variables

Variable Required Notes
NODE_ENV Yes production for live, anything else = dev (looser validation)
DB_NAME / DB_USER / DB_PASSWORD / DB_ROOT_PASSWORD Yes MariaDB credentials
JWT_SECRET Yes 64-byte hex, signs auth tokens
ENCRYPTION_KEY Yes 32-byte (64 hex chars), AES-256 for Plaid tokens + notes. BACK UP
GOOGLE_CLIENT_ID Yes Backend ID-token verification
VITE_GOOGLE_CLIENT_ID Yes Frontend Google button (build-time, same value as above)
ALLOWED_EMAILS Recommended Comma-separated Gmail allowlist. Empty = anyone with a Google account can sign in
PLAID_CLIENT_ID / PLAID_SECRET / PLAID_ENV Yes Plaid keys; env is sandbox or production
PLAID_REDIRECT_URI Production-only OAuth return URL, must match Plaid dashboard exactly
PLAID_WEBHOOK_URL Optional Auto-sync push endpoint; verified by signature
APP_URL / CORS_ORIGIN Yes Your full HTTPS URL; CORS won't start without it in production
SIGNUP_MODE Optional closed for single-user, invite to use the invitation system, open for anything-goes
SYNC_INTERVAL_MINUTES Optional How often the worker polls Plaid for new transactions. Default 60. Webhook-driven syncs fire regardless.
EMAIL_CONFIG Optional disabled (default) or enabled. Master kill-switch for outbound email. UI greys out email-notification settings when disabled.
SMTP_* Optional SMTP credentials, only consulted when EMAIL_CONFIG=enabled. Leave SMTP_HOST blank to log emails to console for testing.

See .env.example for the full annotated template, or run ./bootstrap.sh to generate one with strong randoms.


Contributing & forks

This is a single-tenant personal-finance app, not a SaaS — the assumption is that each person runs their own copy. PRs and issues are welcome at https://github.com/JKJWL/Ledger, but the project is intentionally scoped small: drive-by feature requests that don't fit a one-person/one-household use case may be politely declined.

If you fork it, all you need to update is your .env and your Caddyfile — nothing in the source assumes a particular domain or owner.


License

Licensed under the GNU Affero General Public License v3.0 — see LICENSE for the full text.

The short version of what this means for you:

  • Self-hosting for yourself or your household: do whatever you want. Modify, fork, share with friends. The license is permissive for end users.
  • Forking and shipping your own version: encouraged. Your fork must also be AGPL.
  • Running it as a hosted service that other people pay to access: the AGPL's network-use clause (Section 13) triggers. You must publish the complete corresponding source code of your modified version, including any private patches, under AGPL — and you must make it easy for users of your service to download it.

This is intentionally chosen as a strong-copyleft license to keep the project free and prevent commercial repackaging without contributing back. If you have a use case that AGPL genuinely doesn't fit, open a discussion at the GitHub repo and we can talk.

Why AGPL specifically

AGPL is OSI-approved and accepted by every major Linux distribution, unlike newer "source-available" licenses (SSPL, BUSL, Elastic v2, Commons Clause) which are not. It's the strongest copyleft license you can use while remaining unambiguously open source. Major projects in the same space — Mastodon, Bitwarden, Nextcloud, Plausible — use AGPL for the same reasons.


Acknowledgements

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