**The RaspiBlitz is a all-switches-on Lightning Node based on LND running together with a Bitcoin- or Litecoin-Fullnode on a RaspberryPi3 - with a 1TB HDD and an nice Display for easy setup & monitoring.**
Its mainly targeted for learning how to run your own node decentralized from home. Discover & develop the growing ecosystem of the Lightning Network by becoming a part of it.
The RaspiBlitz is optimized for being setup during a workshop at a hackday or conference. When it comes ready assembled together with a up-to-date synced blockchain its possible to have it ready in about 2 to 3 hours - most is waiting time.
If you start at home ordering the parts from Amazon (see shopping list below) then its a weekend project with a lot of download and syncing time where you can do other stuff while checking on the progress from time to time.
*You can even pay your RaspiBlitz Amazon Shopping with Bitcoin & Lightning thru [Bitrefill](https://blog.bitrefill.com/its-here-buy-amazon-vouchers-with-bitcoin-on-bitrefill-bb2a4449724a).*
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:
* [I dont 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.youtube.com/watch?v=xIfzZXHaCzQ)) and connect thru SSH with the command displayed by the RaspiBlitz:
**Now follow the dialoge 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. Please determine if your problem/question is about RaspiBlitz or for example with LND. For example if you cant route a payment or get an error when opening a channel that is an LND question/problem an is best answered by the LND dev community: https://dev.lightning.community
3. 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.
4. If you havent found an answere yet, open a new issue on the RaspiBlitz GitHub. You may have to register an account with GitHub for this. If its a bug with the RaspiBlitz, please add (copy+paste) a Debug Report to your issue (see [FAQ](FAQ.md) how to generate) and/or add some screenshots/photos so the community gets more insight into your problem.
*The goal is, that all information needed 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.*
*This menu is displayed by the script `00mainMenu.sh` and started automatically on every login of the admin user by admins `.bashrc`. If you want to get to the normal terminal prompt after login, just use CTRL-c or CANCEL. To return to the main menu from the terminal you can use the command `raspiblitz`.*
*The password A,B,C & D idea is directly based in the [RaspiBolt Guide Preperations](https://github.com/Stadicus/guides/blob/master/raspibolt/raspibolt_20_pi.md#write-down-your-passwords) - check out for more background.*
*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.*
*If you have a HDD with a prepared blockchain (e.g. a ready2go-set or you are at a workshop) you can skip to the [next chapter](#setup-lightning). If you started with an empty HDD - you will see the following screen:*
*This can take a while - normally it should be done if you keep it running over night, but some users reported that it took up to 3 days. If it takes longer than that or you cannot see any progress (downloading starting) for over an hour after you started this option consider to cancel the download and go with the COPY option or retry fresh.*
It is safe to close the terminal window (shutdown your laptop) while the RaspiBlitz is doing the torrent download. To check on progress and to continue the setup you need to ssh back in again.
You can cancel the torrent download by keeping the key `x` pressed. Then the download will stop and you will be asked if you want to keep the progress so far. This makes sense if you need to shutdown the RaspiBlitz and you want to continue later or when you want to try another download option but want to keep the option to continue on torrent if the other option is slower or not working.
If you have another computer available (laptop, desktop or another raspiblitz) that already runs a working blockchain (with txindex=1) you can use this option to copy it over to the RaspiBlitz. This will be done over the local network by SCP (SSH file transfere). Choose this option and follow the given instructions.
This is also the best option if you dont like to run your RaspiBlitz with a prepared blockchain by a third party. Then install bitcoin-core in a more powerful computer, sync+validate the blockchain (with txindex=1) there by yourself and copy it over after that thru the local network.
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)
If is a backup way to transfere a blockchain from another computer if copying over the network is not working. More details on the setup can be found [here](FAQ.md#how-do-i-clone-the-blockchain-from-a-2nd-hdd).
This is the fallback of last resort. A RaspberryPi has a very low power CPU and syncing+validating the blockchain directly with the peer2peer network can take multiple weeks - thats why the other options above where invented.
*The "cipher seed mnemonic" is the word list that contains the backup of your private key. If you dont have one from a former RaspiBlitz setup it will be created for you. If you want to recovcer on old LND wallet, thats the point in the setup to enter it.*
Third it will ask you if you want to protect your backup word list with an additional password. You can simple keep this empty and just press ENTER to continue. If you want to go for this extra protection use your chossen PASSWORD D here.
LND will now generate a fresh cipher seed (word list) for you. WRITE THIS DOWN before you continue - without 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 might plan to keep your RaspiBlitz running after trying it out store this word list offline or in a password safe. Hit ENTER once your done.
It will now make sure your wallet is initialized correctly and may ask you to unlock it with your just set PASSWORD C.
*The LND wallet needs to get unlocked on every new start/reboot of the RaspiBlitz.*
The RaspiBlitz will now do final setup configuration like 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 still prepare for some long waiting time after this before you can play around with your new RaspiBlitz. Press OK to make a reboot. Your terminal session will get disconnected and the raspberry pi restarts.
After the reboot is done it takes 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.
After terminal login LND will ask you (like on every start/reboot) to unlock the wallet again - use PASSWORD C:
Now on first start you will habe a longer waiting time (between 1 hour and 2-3 days, depending on your initial setup) ... but thats OK, just leave the RaspiBlitz running until its 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 backgound screen is gone and you see the status screen like further below.
To understand what is taking so long .. its two things:
1. Blockchain Sync
The blockchain on you HDD is not absolutly up-to-date. Depending 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 the rest by directly syncing with the peer-2-peer network until it reaches almost 100%. But even if you see in the beginning a 99.8% this can take time - gaining 1% can be up to 4 hours (depending on network speed). So be patient here.
Automatically if the Blockchain Sync is done LND will start to scan the blockchain and collect information. If you reached this point it should normally just take around 1 hour until the waiting time is over.
If you like to do this all from a webbrowser with a dashboard UI instead from an SSH terminal, go to `SERVICES`, activate the `RTL Webinterface` and after the reboot open in your webbrowser: http://[LOCAL-IP-OF-YOU-NODE]:3000 (PASSWORD B is your RPC password).
These are the features available thru the RaspiBlitz SSH main menu and services. They have the goal to offer some basic/fallback functionality & configurations to you. 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. Its useful to call in a remote situation from SSH if you dont have your RaspiBlitz next to you. But also 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 onto 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 loosing funds. So just play with small amounts - something in then area of 20 EUR/USD should be enough to make your first experiences.*
Before you can open a channel with another node on the network you need to connect this node as a peer to your node.
Opening a channel with a peer is just optional. Having another node a peer helps your node to receive information about the network thru the gossip protocol. It will help your node to find better routes thru the network.
To open a payment channel with another node you can use this option.
Find interessting nodes to open channels with on online directories like [1ML.com](https://1ml.com/).
*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.*
Create an invoice to send to someone or a service to be payed thru lightnig.
*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.*
The autopilot is a feature of LND that you can switch on. It automatically uses around half of your your on-chain funds (if available) to open channels with other lightning nodes the autopilot thinks can be useful to improve your payment routes.
This is a way to make your RaspiBlitz publicly reachable from the internet so that other nodes can open channels with you and you can connect with your mobile wallet from outside your local network.
To do so you can register at an DynamicDomain service like freedns.afraid.org and forward the TCP ports ...
You will be asked for your dynamic domain name such like "mynode.crabdance.org" and you can also optionally set an URL that will be called regularly to update your routers IP with the dynnamic domain service. At freedns.afraid.org this URL is called "Direct URL" under the menu "Dynamic DNS" once you added one.
*NOTE: DynamicDNS just works if you can forward ports on your router and you have a temporary public IP address (your ISP is not running you behind a NAT - like on most mobile connections). Another solution to make your ports reachable from the public internet is to use reverse ssh tunneling - see FAQ on ['How to setup port-forwarding with a SSH tunnel?'](FAQ.md#how-to-setup-port-forwarding-with-a-ssh-tunnel)*
* You tunnel thru the NAT of your router and make Bitcoin and Lightning reachable to all other TOR nodes.
* By using a TOR address it's possible to move the node to a different IPv4 address and keep the existing (=preciously open and funded) channels functional.
The RTL Webinterface is a LND Control Dashboard you can run in your browser with a nice GUI - it offers much more control over your Lightning node than the RaspiBlitu SSH menus. Its recommended to give it a try.
This feature is based on https://github.com/Stadicus/guides/blob/master/raspibolt/raspibolt_6A_auto-unlock.md
It can be activated under "Services" -> "Auto-unlock LND". Its recommended to be turned on, when DynamicDNS is used. Because on a public IP change of your router, LND gets restarted automatically and without Auto-Unlock it will stay inactive/unreachbale until you manually unlock it.
At the moment [ZAP (iOS)](https://github.com/LN-Zap/zap-iOS) and [Shango (iOS/Android)](https://github.com/neogeno/shango-lightning-wallet) are available.
Please keep in mind that if you also want to connect to your smartphone also from the outside (thru LTE, 3G, ..) with your RaspiBlitz you might need to open/forward ports on your router and should look into the DynamicDNS features to handle changeing IP of our Home-DSL.
* [How do I shrink the QR code for connecting my Shango/Zap mobile phone?](FAQ.md#how-do-i-shrink-the-qr-code-for-connecting-my-shangozap-mobile-phone)
The Macaroons and TLS.cert files can be copy+pasted as Hex-Strings from RaspiBlitz to any other app that supports that. If you choose this option RaspiBlitz will all files print for you as Hex-String to do so.
SCP is a SSH like command to transfer files. If were able to SSH into the RaspiBlitz also the SCP to transfere the files should work. If you choose these option, RaspiBlitz will print prepared SCP commands you can copy+paste to run in a second terminal.
Opens an ad-hoc webserver so that you can download the files in your local network thru the browser.
*This is a least secure way to transfere those file - 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.*
##### Renew Macaroons & TLS
Use if you want to invalidate earlier exported Macaroons & TLS files - e.g. lost mobile wallet.
Closes the SSH main menu and exits to the terminal - where the user can make use of the CLI clients `bitcoin-cli`&`lncli` directly to make use of the Bitcoin- and Lightningnode.
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 dont worry, you dont need to re-download the blockchain again.
A ready to use SD card image of the RaspiBlitz for your RaspberryPi is provided as download by us to get everybody started quickly (see above). But if you want to build that image yourself - here is a quick guide:
As you can see from the URL you find the build script in this Git repo under `build_sdcard.sh` - there 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 RaspiBlitze, 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 build sd card as a MASTER copy to backup image and distribute it. Use a smaller 8GB card for that. This way its 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 - its 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 in the subfolder `home.admin`.
Also get inspired for a deep-dive with the original "[RaspiBolt](https://github.com/Stadicus/guides/tree/master/raspibolt)" tutorial on how to build a lightning node on the RaspberryPi which was the base work the RaspiBlitz was developed on - so much thx to Stadicus :)
Join me on twitter [@rootzoll](https://twitter.com/rootzoll), visit us at a upcomming [#lightninghackday](https://twitter.com/hashtag/LightningHackday?src=hash) or check by on 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 :)
