A while back I wrote an article about running a full bitcoin node.Since that time I’ve actually set up the node and run some experiments with it, so I wanted to report back on my experience.Getting Bitcoin installed on Ubuntu is really easy; it’s just a matter of enabling the Bitcoin PPA.This is likely a matter of running the following command on your machine:As I noted in my previous article, compiling bitcoin from the source is another possibility if you’re not on Ubuntu but is a bit more work.The main thing you’ll run into is building Berkeley DB 4.8 from scratch (if you want the portable wallet feature) and possibly memory issues if you have a system with less than 1 GB of memory.I successfully built Bitcoin Core from source on both Debian and Fedora so it’s definitely possible, I just ended up going with Ubuntu and the PPA approach because of the ease of keeping Bitcoin Core up to date that way.Syncing the blockchain still takes a long time.

About a year ago a “headers-first” synchronization option was added to Bitcoin 0.10.0 which is supposed to dramatically reduce the time it takes to initially sync the blockchain; there are some release notes describing the feature here.litecoin nvidiaThe way it works is your bitcoind process fetches all of the “headers” for the blockchain blocks, and the headers contain cryptographic hashes of the blocks.bitcoin per kreditkarte kaufenAfterwards your client can download the blocks in parallel from other nodes in the network, sort of similar to BitTorrent.kumpulin bitcoinIn practice, I found that while my bitcoind process did indeed fetch all of the blocks from the network very quickly, the CPU time it takes to actually verify all of the blocks ends up being the limiting factor in syncing the blockchain.situs bitcoin gratis

The node I’m running has a particularly anemic CPU so I’d imagine that if you had a desktop computer this would be less of an issue.bitcoin 3tStill, it took several days for me to sync the blockchain.Sending and receiving money securely is easy.the bitcoin heistTo receive money:This will generate a new (unique) wallet address for you to receive money.If you use this command every time you want to receive money it will help anonymize your transactions.There are a bunch of other RPCs that are useful, but these should be enough to get started.I was pleasantly surprised to see that on my system there is bash completion for bitcoin-cli, which makes exploring the RPCs a bit easier.Setting up Bitcoin Core to use Tor is also really easy.You just need to add a proxy line to ~/.bitcoin/bitcoin.conf which points to your Tor SOCKS proxy (which by default will be 127.0.0.1:9050).

There are more detailed instructions here.The last thing I tried was setting up JoinMarket which is an open source CoinJoin implementation written in Python.Setting it up is easy, the instructions in the README should be enough to get you started.Once you have JoinMarket installed you can transfer bitcoin into the “zero mixing depth”.Subsequent operations will send bitcoin to deeper mixing depths.Unfortunately, I wasn’t able to actually get this working.When I ran the tumbler.py script it was able to send some bitcoin into the deeper mixing depths, but it never got close to the bottom depth.The tumbler would give me an estimate like “10 hours” and I waited up to 2+ days and never got things close to the bottom mixing depth.I also tried sending coins with the sendpayment.py script and got errors.While I was testing JoinMarket I only put about 0.2 BTC into my JoinMarket wallets (currently worth about $60 USD) while I tested it.

I suspect that my transactions are failing for two reasons: there aren’t enough users on JoinMarket, and my transaction amounts are too small to get picked up by other users.That said, I’m not really interested in transferring more BTC into my JoinMarket wallets until I am able to definitely diagnose this as the problem.I also want to take a minute to figure out how to get coins out if things go awry.Superficially it appears easy since you can easily list the wallet addresses for all of the coins, but I need to spend a bit more time experimenting with this.I’ve seen Chris Belcher (the author of JoinMarket) in the #bitcoin room in Freenode and I also saw that JoinMarket has its own Freenode channel.One of these days when I feel sufficiently motivated I’ll see if I can track someone down on Freenode who can help me with my problems.In the meantime, I am using conventional tumblers, which I really hate doing.I’d love to be able to report good things about JoinMarket in the future.

Ask Ubuntu Sign up or log in to customize your list._ Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top up vote 0 down vote favorite Hello so yesterday I tyried to install Armory, a bitcoin desktop wallet, to house my bitcoins.I am doing this for the sake of undertsanding bitcoins a little more and I do not plan to put large quantities in it as of right now, I am not that stupid.Anyways so I installed armory in ubuntu 16.04 and soon realized that I needed bitcoin core to communicate to the block chain. and rather than doing the simnple PPA methods I found I wanted to compile it myself because I prefer not to truat 3rd parties.I am not Julian Assange but where I can I prefer to not leave dependencies on corporations.Anyway I followed this YouTube video and I have Armory already installed: The YouTube link is in the first imagur link because I am a nub and can only post 2 links, it will be at the bottem of the 3 pictures Here is the issue: When I go to open Armory to play around it first gave me an error saying I needed to go to config to enable rcp.

Below is in sequencial order of how that error occured, my cursor is where I clicked: /a/boKsR So it was late and I just went to bed.But then today I load into Ubuntu and it does this: /a/StZIH It has been 30+ minutes and it still has not connected.I am going to post a picture of the RPC error in a few minutes.If any other logs are needed ask, thanks :) bitcoin up vote 0 down vote What you are encountering is not an error or an installation problem.It's the fact Bitcoin Core needs to download the entire blockchain from beginning to end, and then Armory needs to index it after Bitcoin Core does.This will take a long time to sync up.This is not something you can speed up either.The Bitcoin blockchain is huge and Armory needs that fully synced up Bitcoin Core client for it to work.Your system needs to sync up Bitcoin Core with the >75GB blockchain before your Armory will move forward.30 minutes is not enough time to download that, unless you are on 10Gig fiber or something.