**The RaspiBlitz is a do-it-yourself Lightning Node based on LND running together with a Bitcoin-Fullnode on a RaspberryPi 3/4 - with an HDD/SSD and a nice display for easy setup & monitoring.**
RaspiBlitz is mainly targeted for learning how to run your own node decentralized from home - because: Not your Node, Not your Rules. Discover & develop the growing ecosystem of the Lightning Network by becoming a full part of it. Build it as part of a [workshop](WORKSHOP.md) or as a weekend project yourself.
The RaspiBlitz is optimized for being setup during a workshop at a hackday or conference (see [detailed workshop tutorial](WORKSHOP.md)). When it comes fully assembled with an up-to-date synced blockchain, it's possible to have it ready in about 2 to 3 hours - most of it is waiting time.
If you start at home ordering the parts from Amazon (see shopping list below) then it's a weekend project with a lot of downloading and syncing time where you can do other stuff while checking on the progress from time to time.
If you like to support the RaspiBlitz project you can order a ready-2-go RaspiBlitz or an all-you-need-hardware set for yourself or for your RaspiBlitz workshop from [raspiblitz.com](https://raspiblitz.com)
*Please try to use the exact hardware models that are recommended in the shopping lists. We have had multiple reports where, for example, other SSD or SSD cases/controllers lead to problems. The idea of the shopping lists is to provide you the best tested hardware components that work together - improvement recommendations are always welcome.*
*The "Standard Package" is the most tested and recommended option if you can afford it. It aims to give you the best economic value to run all the RaspiBlitz features with good performance and even allows you to self-validate your blockchain in under 3 days.*
*You can even pay for your RaspiBlitz Amazon Shopping with Bitcoin & Lightning through [Bitrefill](https://blog.bitrefill.com/its-here-buy-amazon-vouchers-with-bitcoin-on-bitrefill-bb2a4449724a).*
*The minimal package aims for the cheapest price and allows you to use old hardware. It will always be possible to run all the basic features of a Bitcoin- & Lightning-Fullnode, but the system might be too slow to validate the blockchain history by itself and run some resource intensive extended services.*
Your SD-card needs to contain the RaspiBlitz software. You can take the long road by [building the SD-card image yourself](#build-the-sd-card-image) or use the already prepared SD-Card image:
SHA-256: 6b9925f274f68ca109771b047c0272df31c01dc0a5d2b9e05b582accfa6029ec or [SIGNATURE](https://raspiblitz.org/raspiblitz-v1.6.1-2020-10-20.img.gz.sig)
You need to write the downloaded SD card image (the img.gz-file) to your SD card (16GB minimum) - you can use the very easy tool Balena Etcher for this: https://www.balena.io/etcher/. It's available for Win, Mac & Linux.
* [I don't have a LAN port on my Laptop - how to connect to my RaspiBlitz?](FAQ.md#i-dont-have-a-lan-port-on-my-laptop---how-to-connect-to-my-raspiblitz)
* [Is it possible to connect the Blitz over Wifi instead of using a LAN cable?](FAQ.md#is-it-possible-to-connect-the-blitz-over-wifi-instead-of-using-a-lan-cable)
* [Can I directly connect the RaspiBlitz with my laptop?](FAQ.md#can-i-directly-connect-the-raspiblitz-with-my-laptop)
Now open up a terminal ([OSX](https://www.youtube.com/watch?v=5XgBd6rjuDQ)/[Win10](https://www.howtogeek.com/336775/how-to-enable-and-use-windows-10s-built-in-ssh-commands/)) and connect through SSH with the command displayed by the RaspiBlitz:
**Now follow the dialogue in your terminal. This can take some time (prepare some coffee) - but in the end you should have a running Lightning node on your RaspberryPi that you can start to learn and hack on.**
If you run into a problem or you have still a question, follow the steps below to get support. Also check the [setup documentation](#setup-process-detailed-documentation) for details.
2. If you have a hardware problem, please check that your hardware parts are exactly the parts recommended in the shopping list above. Different screens or even SSD-casings can cause problems.
4. Please determine if your problem/question is about RaspiBlitz or for example with LND. For example if you can't route a payment or get an error when opening a channel that is an LND question/problem and is best answered by the LND dev community: https://dev.lightning.community
5. Go to the GitHub issues of the RaspiBlitz: https://github.com/rootzoll/raspiblitz/issues Do a search there. Also check closed issues by removing 'is:open' from the filter/search-box.
6. If you haven't found an answer yet, open a new issue on the RaspiBlitz GitHub. You may have to register an account with GitHub for this. If it's a bug with the RaspiBlitz, please add (copy+paste) a Debug Report to your issue (see [FAQ](FAQ.md) for how to generate them) and/or add some screenshots/photos so the community gets more insight into your problem.
*The goal is, that all information needed during setup is provided from the interaction with the RaspiBlitz itself during the setup. Documentation in this chapter is for background, comments for educators and to mention edge cases.*
If you see a warning there, please read carefully, because a lot of things that go wrong later (errors and even loss of funds) relate to problems with the hardware. If you get an OK here ... you are good to go :)
In the beginning you can choose how to setup your RaspiBlitz, by running on Bitcoin or Litecoin with Lightning. This is also the point where you can import a Migration file from an older RaspiBlitz - read about Migration [further down](README.md#import-a-migration-file). The default choice here is Bitcoin.
You can use this [RaspiBlitz Password Sheet (PDF)](https://github.com/rootzoll/raspiblitz/raw/v1.4/home.admin/assets/RaspiBlitzRecoverySheet.pdf) to write those passwords down for save storage and also use it later on for your Seed Words.
*The password A,B,C & D idea is directly based on the [RaspiBolt Guide Preparations](https://stadicus.github.io/RaspiBolt/raspibolt_10_preparations.html#write-down-your-passwords) - check out for more background.*
This is the new password which has to be used for every SSH login after this screen with the user admin. It's also set for the existing user: root, bitcoin & pi.
*The bitcoin and lightning services will later run in the background (as daemon) and use the separate user “bitcoin” for security reasons. This user does not have admin rights and cannot change the system configuration.*
Then the user is asked to enter the Password B - this is internally used for the bitcoin RPC interface. But also as login for additional apps like the RTL-WebGUI or the Blockexplorer:
Your IP can reveal your location (at least to a certain radius) to everyone and your internet provider has a record of your personal identity tied to your IP. When you choose to run behind the Tor network this personal data is much better protected. But running behind Tor reduces speed and might make it more difficult to connect to you for other nodes or pairing other devices and apps to it.
You can switch Tor off later on. You can also switch Tor on after the setup, but keep in mind that once your node is running, your lightning node id can be connected to your public IP.
*If you have a HDD/SSD with a prepared blockchain (e.g. a ready2go-set or you are at a workshop) you have the option to trust that data and skip to the [next chapter](#setup-lightning). If you started with an empty HDD - you will see the following screens:*
*Your HDD/SSD will get formatted with the linux standard file system EXT4. If you want to try out the experimental new [BTRFS](FAQ.md#why-use-btrfs-on-raspiblitz) that RaspiBlitz supports since v1.4 - you need to start the setup with an additional 32GB USB thumb drive connected to the second USB3 port of the RaspberryPi. Then you will unlock this new secret feature.*
With the new RaspberryPi 4 (with SSD & min 2GB RAM) this is the best way to go. It will take around 2-3 days to sync & validate directly with the bitcoin network. With this option, you have done it the original `don't trust, verify` way.
*For the old RaspberryPi 3 this is not recommended. A RaspberryPi 3 has a very low power CPU and syncing+validating the blockchain directly with the peer2peer network can take multiple weeks - that's why for a RP3 you should choose the COPY option .*
First you need to download & validate the blockchain on your own computer/laptop. Todo so install bitcoin-core (0.18.1 or higher) from [bitcoin.org](https://bitcoin.org/en/download) and keep it running until blockchain is synced (will need around 320 GB).
Then you can use the COPY option to copy the blockchain over to the RaspiBlitz. This will be done over the local network by SCP (SSH file transfer) - follow the instructions given during the dialog.
More details: [I have the full blockchain on another computer. How do I copy it to the RaspiBlitz?](FAQ.md#i-have-the-full-blockchain-on-another-computer-how-do-i-copy-it-to-the-raspiblitz)
WRITE YOUR PERSONAL WORDS DOWN before you continue - without it you limit your chances to recover funds in case of failing hardware etc. If you just want to try/experiment with the RaspiBlitz, at least take a photo with your smartphone just in case. If you plan to keep your RaspiBlitz running, store this word list offline or in a password safe. You can use the [RaspiBlitz Password Sheet (PDF)](https://github.com/rootzoll/raspiblitz/raw/v1.4/home.admin/assets/RaspiBlitzRecoverySheet.pdf) for this.
Choose this option if you have made a complete backup of the LND data and have a tar.gz file starting with the word 'lnd-rescue' available. It will recover all your on-chain funds and open channels you had. But you have to make sure that the LND backup you have is really the latest version - otherwise you might lose channel funds.
*If you have tar.gz file that starts with 'raspiblitz', that's a migration file. That also includes your old LND wallet, but you import it earlier in the setup process .. see further below for details.*
Next best option is, if you have the channel.backup file and the word list seed. This is the best chance to recover the on-chain funds you had in open channels. But all channels you had open before will be closed during this procedure.
If you just have the word list (RaspiBlitz 1.1 and older) you can at least try to recover your on-chain funds. Recovery of channel funds is not very likely in this scenario.
The RaspiBlitz will now do final setup configuration, such as installing tools, moving the SWAP file to the HDD, or activating the firewall. You will see some text moving across the screen until this screen:
The basic setup is done - hooray ... but it may still take some time before everything is ready and you can play around with your new RaspiBlitz. Press 'OK' to reboot. Your terminal session will get disconnected and the raspberry pi restarts.
After the reboot is done, it will take a while for all services to start up - wait until you see on the LCD/display that LND wallet needs to get unlocked. Then SSH in again with the same command like in the beginning (check LCD/display) but this time (and every following login) use your PASSWORD A.
On first start, you will have a longer waiting time (between 10 minutes and 2-3 days, depending on your initial setup) ... but that's OK, just leave the RaspiBlitz running until it's done.
*You can even close your terminal now and shutdown your laptop and ssh back in later on. You will see on the Blitz LCD/display that it is ready when the blue background screen is gone, and you see a status screen.*
The blockchain on your HDD is not absolutely up-to-date. Depending on how you got it transferred to your RaspiBlitz it will be some hours, days, or even weeks behind. Now the RaspiBlitz needs to catch-up on the rest by directly syncing with the peer-2-peer network until it reaches almost 100%. Even if you see progress at 99.8%, there can still be waiting time - gaining 1% can take up to 4 hours (depending on network speed), so be patient here.
Automatically if the Blockchain Sync is progressing LND will start to scan the blockchain and collect information. The Lightning scanning alone normally just takes around 1 hour until the waiting time is over. Can take much longer if you recover on old wallet from seed.
If you would prefer to do this from a web browser with a dashboard UI, instead of an SSH terminal, go to `SERVICES`, activate the `RTL Webinterface`, and after the reboot you will see a new `RTL` option in the SSH main menu - it will give you all the information so that you can now open the RTL Webinterface in your browser.
*BTW always love seeing photos of new RaspBlitzes added to the network on twitter @rootzoll - also there is a [RaspiBlitz Donation Page](https://tallyco.in/s/r5lx23/), why not try to send some satoshis there with your new RaspiBlitz :D *
These are the features available through the RaspiBlitz SSH menus. They have the goal to offer some basic/fallback functionality & configurations. More complex or user-friendly tasks are best to be done with wallets, apps and scripts you connect to your Lightning Node via [APIs](#interface--apis) - because you have a full Bitcoin- and Lightning-Node on the RaspiBlitz.
This is the screen that gets displayed on the LCD/display. It's useful to call in a remote situation from SSH if you don't have your RaspiBlitz next to you, or if you want to copy+paste your nodeID or make a screenshot.
Before you can open channels with other nodes you need to put some coins in your LND on-chain wallet. Use this option to generate an address to send funds to.
*Reminder: RaspiBlitz & LND is still experimental software. With funding your LND node you accept the risk of losing funds. So just play with small amounts - something in the area of 20 EUR/USD should be enough to make your first experiences. Also, it's a good privacy practice to [coinjoin your coins](https://bitcoin-only.com/#privacy) before sending them to any Lightning Network wallet.*
You can fund it multiple times - starting with small amounts first to test. LND will always generate a different address, but all funds you send will get into the same LND on-chain wallet.
Opening a channel with a peer is just optional. Having another node as peer helps your node to receive information about the network through the gossip protocol. It will help your node to find better routes through the network.
Find interesting nodes to open channels with through online directories like [1ML.com](https://1ml.com/) or join the RaspiBlitz NodeManager telegram group to meet people to open channels with: https://t.me/raspiblitz
Bear in mind that this option will open a public channel that can be seen by everyone in the network. This is good if you want to route payments. If your intention is to use it privately only, you must go to the command line and open the channel with the -private option.
*This is just a very basic shell script. For more usability, try the RTL Webinterface (under Services) or connect a (mobile) wallet with your RaspiBlitz.*
*This is just a very basic shell script. For more usability try the RTL Webinterface (under Services) or connect a (mobile) wallet with your RaspiBlitz.*
If you are looking for something to test payments with Lightning ... why not [donate some satoshis to RaspiBlitz development](https://tallyco.in/s/r5lx23/)? Thanks :)
*This is just a very basic shell script. For more usability try the RTL Webinterface (under Services) or connect a (mobile) wallet with your RaspiBlitz.*
You may choose to force-close some channels where the channel partner is no longer reachable. Keep in mind that when you force-close a channel, it can take a much longer time until your funds are available again through your on-chain wallet.
If you connected your node well within the Lightning Network you can become a "Routing Node". Other users might select your Node as part of a Lightning Payment and will pay you the fee you set on those channels. This menu point gives you a detailed report over the amount of days you set.
Beware - earning fees as a routing node does not come automatic. It's a bit of hard work of building the right channels to be attractive for other people to route thru. Check the internet for tutorials or use tools like "lndmanage" (see under RaspiBlitz SERVICES) to help you analyse and optimize your channel management.
* By using a Tor address it's possible to move the node to a different IPv4 address and keep the existing (i.e. previously opened and funded) channels functional.
The autopilot is a feature of LND that you can switch on. It automatically uses around half of your on-chain funds (if available) to open channels with other lightning nodes the autopilot thinks can be useful to improve your payment routes.
Keysend is a feature of LND that allows your node to accept payments without creating an invoice first. This needs to be activated for example if you want to use your nodes for experimental messaging over the Lightning Network (see RaspiBlitz MOBILE apps like SendMany).
It can be activated under "Services" -> "Auto-unlock LND". We recommend that it be turned on, when DynamicDNS is used. If there is a public IP change on your router, LND restarts automatically, and without Auto-Unlock it will stay inactive/unreachable until you manually unlock it.
See [below on this README](README.md#backup-for-on-chain---channel-funds) for your Backup options to secure your funds against loss. Storing the encrypted Static Channel Backup file to your Dropbox account is an easy and secure way to do this.
You can connect a small extra USB drive to your RaspiBlitz (choose a small one up to 32GB - don't use second HDD or SSD here, that would drain too much power from the RaspiBlitz). On that USB drive your latest StaticChannelBackup will be stored - just in case your HDD gets an error.
Activate/Deactivate service selection with the space bar and then select 'OK' to trigger Install/Uninstall. You can find more details about those options below (top to bottom):
A Submarine Swaps Service by lighting labs. You call it from the RaspiBlitz terminal with the command 'loop' - if you have the RTL service installed (see below), then loop will also be available as part of the RTL web interface. You can use Loop for example to send satoshies from one of your channels to an on-chain bitcoin address without closing the channel for a fee. This can be use full to send earned satoshies to your hardware wallet while freeing up your inbound liquidity on your channels again.
Lightning Pool is a non-custodial, peer-to-peer marketplace that allows node operators that need inbound liquidity to pay node operators with available capital to open channels in their direction while retaining full custody of their funds. Pool’s first product is a Lightning Channel Lease - an inbound channel with a pre-agreed duration.
[Details on Service](https://github.com/lightninglabs/pool)
After install, you will see a new `POOL` option in the SSH main menu - it will give you all the information you need to start using it.
The RTL Webinterface is an LND Control Dashboard you can run in your browser with a nice GUI - it offers much more control over your Lightning node than the RaspiBlitz SSH menus. It's recommended to give it a try.
Bitcoin Core has a very powerful command line interface and a wonderful daemon. Using pre-signed bitcoin transactions (PSBT) and [Hardware Wallet Interface](https://github.com/bitcoin-core/HWI) (HWI), it can also work with hardware wallets. At the moment it is very Linux-focused. The same applies to multi-signature setups.
The goal of SpecterDesktop is to make a convenient and user-friendly GUI around Bitcoin Core, focusing on multi-signature setups with airgapped hardware wallets like Trezor, Ledger, COLDCARD or the Specter-DIY.
Enables a user to run his own Electrum server on the RaspiBlitz. The server indexes the entire Bitcoin blockchain saved locally on your HDD/SSD, and the resulting index enables fast queries for any given user wallet, allowing the user to keep real-time track of his balances and his transaction history using the [Electrum wallet](https://electrum.org).
Since Electrum Rust Server runs on the user's own machine, there is no need for the wallet to communicate with external Electrum servers, thus preserving the privacy of addresses and balances.
By contrast, if you use your Trezor Hardware Wallet with the trezor.io wallet, it will tell their third party server your public keys - connecting it with your IP. Now you can use your Trezor with the Electrum Wallet, just talking to your own Electrum Server, preserving your privacy.
[BTCPay Server](https://github.com/btcpayserver) is a self-hosted, open-source cryptocurrency payment processor. It's secure, private, censorship-resistant and free.
JoinMarket is software to create a special kind of bitcoin transaction called a CoinJoin transaction. Its aim is to improve the confidentiality and privacy of bitcoin transactions.
A CoinJoin transaction requires other people to take part. The right resources (coins) have to be in the right place, at the right time, in the right quantity. This isn't a software or tech problem, it's an economic problem. JoinMarket works by creating a new kind of market that would allocate these resources in the best way.
The Sphinx App allows chat over the Lightning Network and ties into the idea of [Podcasting 2.0](https://u.today/father-of-podcasting-integrates-bitcoin-lightning-into-his-app). To use the mobile app with your own RaspiBlitz you need to install the [Sphinx Relay Server](https://github.com/stakwork/sphinx-relay/blob/master/README.md).
IP2TOR is a tunnel service where you can run your RaspiBlitz anonymously behind TOR but you rent a port on a clearnet IP thru which you can make services of your RaspiBlitz easy reachable for everybody on the internet. You don't need to care about your local router or firewall settings. You can pay this service also directly thru Lightning from your RaspiBlitz as subscription.
You will get a list of available IP2TOR bridge offerings. Select `OK` on an IP2TOR bridge offering and you will see more details on it, such as how many satoshis the subscription will cost you - your node should be funded and have channels open at this point.
Then you get a list of available IP2TOR bridge offerings. By selecting `OK` on a IP2TOR bridge offering you can get more details on it and you will also see how many satoshis the subscription will cost you - your node should be funded and you should have channels open at this point.
If you choose `AGREE` on the details of a IP2TOR bridge offering the RaspiBlitz tries for you to setup the IP2TOR bridge. If everything worked you will find now the subscription under `MAINMENU` > `SUBSCRIBE` > `LIST My Subscriptions` where you can cancel it again.
To try out the IP2TOR tunnel choose in `MAINMENU` the extra menu point of the Service you choose the bridge for and it should give you now an updated URL or try calling the API on the IP and Port that is displayed under the details of the subscription in the `LIST My Subscriptions` section.
If you want a Webservice like BTCPay Server or LNbits available to the outside internet (like with IP2TOR) people expect you to offer HTTPS address so that the communication between the client and your RaspiBlitz is encrypted. You could use the self-signed HTTPS certificate that RaspiBlitzis offering you, but this will give users Security Warnings in their browser and is not very user friendly. That's where you can use a LetsEncrypt Subscription to get a free valid HTTPS certificate that is excepted without warning from almost all common browsers.
Because you also need a domain name for that you will need to open a free account on [DuckDNS.org](https://www.duckdns.org) ... further options might be added in the future.
When you create a new LetsEncrypt subscription, you will be asked for your subdomain on DuckDNS and the Auth-Token of your DuckDNS account. Then RaspiBlitz tries to setup everything for you. If everything worked, you will find the subscription under `MAINMENU` > `SUBSCRIBE` > `LIST My Subscriptions`, where you can cancel it at any time if you wish.
To try out the IP2TOR tunnel, go into `MAINMENU` and the extra menu point of the Service you want to use the bridge for. It should give you an updated URL to call your service.
Mobile wallets work as a remote control app for your RaspiBlitz. First you need to install the apps on your phone - a QR code with the links to the app stores are displayed. Then you need to `pair` them with your RaspiBlitz - also via a QR code displayed on the LCD. If you run your RaspiBlitz without an LCD, there is the fallback option to display that QR code on the terminal as ASCII code (which might involve lowering your terminal's font size).
The Macaroons and TLS.cert files can be copy+pasted as Hex-Strings from RaspiBlitz to any other app that supports that format. If you choose this option, RaspiBlitz will print all the files for you as Hex-String to do so.
SCP is a SSH like command to transfer files. If we're able to SSH into the RaspiBlitz, also the SCP to transfer the files should work. If you choose this option, RaspiBlitz will print prepared SCP commands you can copy+paste to run in a second terminal.
*This is the least secure way to transfer those files - everybody in your local network has access to those file during download. Remember with the Admin-Macaroon somebody could takeover your node and spend all your funds. Just use as last fallback.*
This stops your RaspiBlitz and creates an LND-Rescue ZIP file that you can download via SCP to your laptop. This can be used to move your LND id, wallet & channels to another RaspiBlitz.
This stops your RaspiBlitz and creates a Migration ZIP file you can download/export per SCP to your laptop. This contains all important data of your RaspiBlitz including LND, your Blitz configuration and also data from your installed apps. Can be used to migrate your RaspiBlitz to a new hardware - for example if you want to replace the HDD with a SSD. How to import a Migration File [see here](README.md#import-a-migration-file).
To expedite the setup process, you can connect another RaspiBlitz and copy over your blockchain data to it. Your RaspiBlitz will be `offline` during that process and it can take between 4 to 6 hours.
Make sure both RaspiBlitzes are connected to the same local network. During setup with the new RaspiBlitz, choose the `COPY` option to get the blockchain data and then select the source computer `RASPIBLITZ`. Now you can activate the `COPY-SOURCE` option, enter the given IP of the new RaspiBlitz and its Password A (not yours) .. then the process should start.
Use this option if your blockchain data got corrupted. It will keep your LND data. You can even keep your channels open. Just keep in mind that your Lightning node will appear offline to the network until you have re-downloaded the blockchain.
If you had the Bitcoin Transaction Index activated you can use this option to make sure that this extra space consuming index gets deleted as well to free up space.
This is common way to update your RaspiBlitz. Choose this option to prepare your RaspiBlitz for a new SD card image containing the new version release.
Sometimes there is a new LND release that has some breaking changes that once you updated the LND database cannot be reversed (like the update from 0.9.2 to 0.10.0). Then RaspiBlitz offers you an optional update ... this is where you then can update LND.
If you choose this you get the option to do this `VERIFIED` that means it offers you the optional LND update we tested the RaspiBlitz with or `RECKLESS` which will just grab the latest LND release from the GitHub releases page (also Release Candidates) and install it with no further guarantees and verification checks - this is for people that run nodes to test new releases and how they work with existing RaspiBlitz apps.
With Patching you have now an easy way to sync your RaspiBlitz code/scripts with the official RaspiBlitz GitHub Repo or even your own forked GitHub Repo. This is an option for people that report bugs and we like to offer them a quick script update (patch) between RaspiBlitz releases or for people who want to develolp on the RaspiBlitz and sync code between their IDE, forked GitHub and their RaspiBlitz.
A Migration file contains all the important data from your RaspiBlitz, like your LND data, Bitcoin Wallet, raspiblitz.config, Tor/SSH keys .. and also installed apps. You can use this to migrate your RaspiBlitz to new hardware.
If you want to import it again to a new RaspiBlitz (for example with an updated HDD/SSD), you can choose the `MIGRATION` option on the first setup dialog after the Hardware test (where you normally choose between Bitcoin & Litecoin).
Normally you choose here the EXT4 format. But you also have the option to choose the BTRFS format which is an experimental feature under RaspiBlitz - see [FAQ for details on BTRFS](FAQ.md#why-use-btrfs-on-raspiblitz).
You have the two options: [SYNC](README.md#1-sync---selfvalidate-all-blocks) and [COPY](README.md#2-copy---copy-from-laptop-or-another-raspiblitz-over-local-network), as mentioned in the normal setup.
Since LND v0.6 (and RaspiBlitz v1.2), a feature called Static-Channel-Backups is available. Within RaspiBlitz this is used when a `channel.backup` file is mentioned.
You should have written down the word seed during wallet setup; keep it at a safe (offline) location. The `channel.backup` is stored on the HDD and updated by LND every time a new channel is opened or closed. The latest version of this file is needed to recover all your funds. In case your HDD gets damaged, RaspiBlitz always keeps a copy of the latest version of the `channel.backup` file on the SD card within the sub-directories of: `/home/admin/.lnd/data/chain/`.
If you want to get one step further in securing your funds against total fall-out of the RaspiBlitz (gets completely damaged, stolen or lost) then you can additionally set up an off-location or cloud backup of the `channel.backup` file. The file itself is encrypted by your word seed - so it's OK to store the file to untrusted third parties for backup (if you want).
This video explains in detail how you can set further back Static Channel information:
Activate the StaticChannelBackup to DropBox in the `SETTINGS` menu of your RaspiBlitz. It will ask you for the Dropbox-Authtoken. This is how you can get this token:
Choose the 'Scoped Access' & 'App Folder' and set a unique name - for example `LNDbackup` with a random number behind it. Agree to Terms of Service and click 'Create App'.
Its important first to select the `Permissions` tab and activate the `files.content.write` permission. Dont forget to `Submit` the change before continue.
Now go back to the 'Settings' tab and under 'OAuth2' click the 'Generate' button. You will now see a long string of letters and numbers appear. This is your **Dropbox-Authtoken**. Make sure to copy the complete token string .. there might be more if you scroll to the right in the token field.
To test it, try opening or closing a channel, and then check if you can find a copy of `channel.backup` in your Dropbox. You can check the background-script logs to see details on errors: `sudo journalctl -f -u background`
In the `/mnt/hdd/raspiblitz.conf` the parameter `scpBackupTarget='[USER]@[SERVER]:[DIRPATH-WITHOUT-ENDING-/]'` can be set to activate this feature. On that remote server the public key of the RaspiBlitz root user needs to be part of the authorized keys - so that no password is needed for the background script to make the backup.
To test it, try opening or closing a channel, and then check if you can find a copy of `channel.backup` on your remote server. You can check the background-script logs to see details on errors: `sudo journalctl -f -u background`
You can use a small USB thumb drive (everything over 120MB is fine). Please don't use a second HDD/SSD for this because that might drain too much power and could hurt the security of your data more then it helps.
To test it, try opening or closing a channel, and then check if you can find a copy of `channel.backup` in the specified location. You can check the background-script logs to see details on errors: `sudo journalctl -f -u background`
If you have a RaspiBlitz v1.2 or higher - just follow the `UPDATE` option from the main menu (choose `RELEASE` if asked) and follow the instructions - see the process in detail in the following video.
Now download the new RaspiBlitz SD card image and write it to your SD card. Yes, you simply overwrite the old one, it's OK! The RaspiBlitz stores all your personal data on the HDD. See details about latest SD card image [here](#installing-the-software).
*If you have done manual changes to the system (installed packages, added scripts, etc), you might need to do some preparations before overwriting your SD card - see [FAQ](FAQ.md#why-do-i-need-to-re-burn-my-sd-card-for-an-update).*
If done successfully, simply put the SD card into the RaspiBlitz and power on again. Then follow the instructions on the display ... and don't worry, you don't need to re-download the blockchain again. It is worth noting here that your SSH password will be reset to `raspiblitz`. You will be promted to change this once the update is finished.
A ready-to-use SD card image of RaspiBlitz is provided by us for download, to get everybody started quickly (see above). But if you want to build that image yourself - here is a quick guide:
Now you are ready to start the SD card build script (check the code to see if the installation and config are OK for you). Copy the following command into your terminal and execute:
As you can see from the URL, you can find the build script in this Git repo under `build_sdcard.sh`. You can check what gets installed and configured in detail. Feel free to post improvements as pull requests.
The whole build process takes a while. At the end the LCD drivers get installed and a reboot is needed. A user `admin` is created during the process. Remember the default password is now `raspiblitz`. You can login per SSH again - this time use admin: `ssh admin@[IP-OF-YOUR-RASPI]`. An installer of the SD card image should automatically launch. If you do not want to continue with the installation at this moment and use this sd card as a template for setting up multiple RaspiBlitzes, click `Cancel` and run `/home/admin/XXprepareRelease.sh`. Once you see the LCD going white and the activity LED of the pi starts going dark, you can unplug power and remove the SD card. You have now built your own RaspiBlitz SD card image.
*Note: If you plan to use your self-built sd card as a MASTER copy to backup image and distribute it. Use a smaller 8GB card for that. This way it's ensured that it will fit on every 16 GB card recommended for RaspiBlitz later on.*
Everybody is welcome to join, improve, and extend the RaspiBlitz - it's a work in progress. [Check the issues](https://github.com/rootzoll/raspiblitz/issues) if you wanna help out or add new ideas. You find the scripts used for RaspiBlitz interactions on the device at `/home/admin` or in this Git repo's subfolder `home.admin`.
To start your Deep Dive into the RaspiBlitz project, the following YouTube video (July 2020) is recommended: [https://www.youtube.com/watch?v=QXUGg45CWLo](https://www.youtube.com/watch?v=QXUGg45CWLo)
Also get inspired for a deep-dive with the original "[RaspiBolt](https://stadicus.github.io/RaspiBolt/)" tutorial on how to build a lightning node on the RaspberryPi, the base work on which the RaspiBlitz was developed - so much thx to Stadicus :)
Join me on twitter [@rootzoll](https://twitter.com/rootzoll), visit us at an upcoming [#lightninghackday](https://twitter.com/hashtag/LightningHackday?src=hash) or check by one of our bitcoin meetups in Berlin ... every 1st Thursday evening a month at the room77 bar - feel free to buy me a beer with lightning there :)
