@ -323,7 +323,7 @@ Also there are first free 3D open source files in this repo in the directory `ca
## Are those "Under-Voltage detected" warnings a problem?
When your USB power adapter for the RaspiBlitz delivers too low power those messages with "Under-Voltage detected" (undervoltage) are shortly seen on the display. If you see those just one or two times that's not OK, but can be in a tolerant window. Nevertheless make sure your USB power adapter can deliver at least 3A. If you still see those warnings maybe get a second USB Power adapter just for the HDD and power the HDD through a Y-Cable - see https://en.wikipedia.org/wiki/Y-cable#USB
When your USB power adapter for the RaspiBlitz delivers too low power those messages with "Under-Voltage detected" (undervoltage) are shortly seen on the display. This can lead to data loss/corruption on the HDD. If you see those just one or two times that's not OK, but can be in a tolerant window. Nevertheless it make sure your USB power adapter can deliver at least 3A (big and stable is good). If you still see those warnings maybe get a second USB Power adapter just for the HDD and power the HDD through a Y-Cable - see https://en.wikipedia.org/wiki/Y-cable#USB or put a USB Hub with extra power between the raspberry and the HDD.
## Why do we need to download the blockchain and not syncing it?
@ -339,7 +339,7 @@ The best way would be to build the sd card yourself. You use the script `build_s
To download a blockchain from a third party (torrent/ftp) is not optimal and for the future with more cheap & powerfull SingleBoardComputers we could get rid of this 'patch'.
The downloaded blockchain is pre-indexed and pre-validated. That should be practically secure enough, because if the user gets a "manipulated" blockchain it would not work after setup. The beginning of the downloaded blockchain needs to fit the genesis block (in bitcoind software) and the end of the downloaded blockchain needs not match with the rest of the bitcoin network state - hashes of new block distrubuted within the peer-2-peer network need to match the downloaded blockchain head. So if you downloaded a manipulated blockchain it would simply just don't work in practice. As long as you are not in a totally hostile environment where someone would be able to fake a whole network of peers and miners around you - this is secure enough for running a small funded full node to try out the lightning network.
The downloaded blockchain is pre-indexed and pre-validated. That should be practically secure enough, because if the user gets a "manipulated" blockchain it would not work after setup. The beginning of the downloaded blockchain needs to fit the genesis block (in bitcoind software) and the end of the downloaded blockchain needs not match with the rest of the bitcoin network state - hashes of new block distrubuted within the peer-2-peer network need to match the downloaded blockchain head. So if you downloaded a manipulated blockchain it simply wouldn't work in practice. As long as you are not in a totally hostile environment where someone would be able to fake a whole network of peers and miners around you - this is secure enough for running a small funded full node to try out the lightning network.
If you dont trust the download or you want to run the RaspiBlitz in a more production like setup (on your own risk) then don't use the torrent/ftp download and choose the option to COPY the blockchain data from a more powerful computer (laptop or desktop) where you synced, verified and indexed the blockchain all by your yourself - see [README](README.md#4-copying-from-another-computer) for more details.
Raumi
6 years ago