[Bulletin] Building a Bitcoin protocol CLI using

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Collection of pentesting tools by BrainfuckSec

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submitted by _brainfuck to Pentesting [link] [comments]

A simple guide to financial sovereignty (set up your Bitcoin fullnode)

In 2009, a 9 pages white paper by satoshi Nakamoto described a protocol that made central banking obselete. It's a new paradigm where monney is no longer controlled by a few, but by the whole network.
The shift is already happening, as we speak, even if it's hard to see, especially if you lack the fundamental knowledege of cryptoghraphy, game theory and economics. It's just a matter of time before you realize that Bitcoin is hard money, and for the first time we have a framework to apply austrian economics, without permission. Time to reset the keynesian monopoly game.
I don't think people are inherently bad, it's just that in the actual system (which I call the legacy system) people are incentivised to make decisions that are good from their individual perspective, but unfortunately, the sum of those individual decisions are bad from the collective group perspective. That's just plain simple game theory. What makes Bitcoin so special is it's perfectly aligned set of incentives that makes individuals and collectives outcomes better. It switches the economic model from keynesian to austrian, inflation to deflation, spending to saving, modern slavery (throught debt) to financial sovereingty, de-evolution to evolution. We are currently shifting from fiat to Bitcoin.
What you think capitalism is has nothing to do with what Capitalism really is in a free market. Capitalism is beautiful, it's simply the act of evolution, saving and optimising for consumming only what's needed (don't forget with live in a world with limited ressources, yes we all forgot). Stop spending and start capitalising, that's what we should be doing. But it's near impossible in a world run by socialists imposing debt using violence. What do you think back the US dollar ? gold ? no no, only tanks, aircraft carriers, soldiers and corrupt politicians.
Our only way out of this madness with the minimum violence is Bitcoin.
To be clear, if you dont run a fullnode, then you don't validate the transactions yourself (which is one purpose of running a fullnode). If you don't do the job yourself, then you have no other choice then to trust someone else for it. That's not necesserely a bad thing, as long as you are aware of it. You have no say in what defines Bitcoin, you enforce no rules. You serve no purpose in the Bitcoin realm. Why not !
Now if you seek financial sovereignty and want to take part in the new money paradigm, you will need to operate a fullnode and get your hands a little dirty. This guide hopefuly will take you there while walking you through the steps of setting up your autonomous Bitcoin Core full node.
Why Bitcoin Core ? simply because the Bitcoin core client implement and enforce the set of rules that I myself define as being Bitcoin.

Prerequis

install

Choose & download the latest binaries for your platform directly from github: https://bitcoincore.org/bin/bitcoin-core-0.16.2
at the time of writing, the latest bitcoin core version is 0.16.2
wget https://bitcoincore.org/bin/bitcoin-core-0.16.2/bitcoin-0.16.2-x86_64-linux-gnu.tar.gz tar -zxvf bitcoin-0.16.2-x86_64-linux-gnu.tar.gz sudo mv bitcoin-0.16.2/bin/* /uslocal/bin/ rm -rf bitcoin-0.16.2-x86_64-linux-gnu.tar.gz bitcoin-0.16.2 # clean 

firewall

Make sure the needed ports (8333, 8332) are open on your server. If you don't know, you can & should use a firewall on your server. I use ufw, which stands for uncomplicated firewall.
sudo apt install ufw # install ufw 
configure default rules & enable firewall
sudo ufw default deny incoming sudo ufw default allow outgoing sudo ufw allow ssh # if you operate your server via ssh dont forget to allow ssh before enabling sudo ufw enable 
Once your firewall is ready, open the bitcoin ports :
sudo ufw allow 8333 # mainnet sudo ufw allow 8332 # mainnet rpc/http sudo ufw allow 7000 # netcat transfert (for trusted sync) 
check your firewall rules with sudo ufw status numbered

init

Start bitcoind so that it create the initial ~/.bitcoin folder structure.
bitcoind& # launch daemon (the & run the copmmand in the background) bitcoin-cli stop # stop the daemon once folder structure is created 

config

In my case, for a personnal fullnode, I want to run a full txindexed chain. We only live once and i want all options to be possible/available :) If you plan to interact with the lightning network in the future and want to stay 100% trustless, I encourage you txindexing the chain (because you'll need an indexed chain). it's not hard to txindex the chain later on, but the less you touch the data, the better. so always better to start with txindex=1 if you want to go for the long run. It only adds 26Go on top of the 200Go non indexed chain. So it's worth it !
Just to get an idea of the size of the bitcoin core chain (August 23, 2018) :
network folder txindexed height size
mainnet blocks + chainstate yes 538.094 209Go + 2.7Go = 221.7
mainnet blocks + chainstate no 538.094 193Go + 2.7Go = 195.7Go
testnet blocks + chainstate yes - -
testnet blocks + chainstate no 1.407.580 20Go + 982Mo = 21Go
Create a bitcoin.conf config file in the ~/.bitcoin folder. This is my default settings, feel free to adjust to your need. [ see full config Running Bitcoin - Bitcoin Wiki ]
# see full config here https://en.bitcoin.it/wiki/Running_Bitcoin # Global daemon=1 txindex=1 rpcallowip=0.0.0.0/0 # bind network interface to local only for now server=1 rest=1 # RPC rpcport=8332 rpcuser=admin rpcpassword=password # define a password rpcworkqueue=100 # zmq zmqpubrawblock=tcp://*:8331 zmqpubrawtx=tcp://*:8331 #zmqpubhashblock=tcp://*:8331 #zmqpubhashtx=tcp://*:8331 # numbers of peers. default to 125 maxconnections=10 # utxo cache. default to 300M dbcache=100 # Spam protection limitfreerelay=10 minrelaytxfee=0.0001 

Sync the blockchain

There are 2 ways you can donwload/sync the bitcoin blochain :

Network sync (default)

If this is the first time you are setting up a bitcoin full node, it's the only way to trust the data. It will take time, depending on your hardware and network speed, it could vary from hours to days. You have nothing to do but leave the bitcoind daemon running. check status with bitcoin-cli getblockchaininfo, kill daemon with bitcoin-cli stop.
Remember that this is the only procedure you should use in order to sync the blockchain for the first time, as you don't want to trust anyone with that data except the network itself.

Trusted sync

Skip this chapter if this is the first you're setting up a full node.
Once you operate a fully "network trusted" node, if you'd like to operate other nodes, syncing them from your trusted node(s) will go much faster, since you simply have to copy the trusted data from server to server directly, instead of going throught the bitcoin core network sync.
You will need to transfer the chainstate & blocks directory from the ~/.bitcoin folder of one of your trusted node to the new one. The way you achieve that transfer is up to you.
At the time of writing (August 23, 2018), the txindexed blockchain (chainstate + blocks up to height 538.094) is around 220Go. Moving that quantity of data over the network is not a trivial task, but if the transfer happens between 2 reliable servers, then netcat will be great for the job. (netcat sends raw tcp packets, there is no authentification or resume feature).
Note: with netcat, if one of the servers connection is not stable, and you lose connection, you will have to start again. that's a bummer. in that case you are better of with tools like rsync or rcp that let you resume a transfer.
In order to make the transfer a simple task, make sure you do the following on both of the receiver and the sender server :
Once both your servers (receiver & sender) are netcat ready, proceed as follow :
This is the transfer times for my last data sync between 2 servers hosted at time4vps.eu (not too bad) | folder | size | transfer time | - | - | - | blocks | 209Go | 5h20 | chainstate | 2.7Go | 4min

bitcoind as a service

For ease of use and 100% uptime, simply add bitcoind to your system service manager (in my case systemd) create the file /etc/systemd/system/bitcoind.service and add the following to it :
[Unit] Description=Bitcoin daemon After=network.target [Service] User=larafale RuntimeDirectory=bitcoind Type=forking ExecStart=/uslocal/bin/bitcoind -conf=/home/larafale/.bitcoin/bitcoin.conf ExecStop=/uslocal/bin/bitcoin-cli stop KillMode=process Restart=always RestartSec=120 TimeoutSec=240 # Hardening measures #################### # Provide a private /tmp and /vatmp. PrivateTmp=true # Mount /usr, /boot/ and /etc read-only for the process. ProtectSystem=full # Disallow the process and all of its children to gain # new privileges through execve(). NoNewPrivileges=true # Use a new /dev namespace only populated with API pseudo devices # such as /dev/null, /dev/zero and /dev/random. PrivateDevices=true # Deny the creation of writable and executable memory mappings. MemoryDenyWriteExecute=true [Install] WantedBy=multi-user.target 
Don't forget to correct the user name & the bitcoin.conf path. Once the systemd bitcoind config file is created, reload system services and start the bitcoind service:
sudo systemctl daemon-reload # reload new services sudo systemctl enable bitcoind # enable bitcoind sudo systemctl start bitcoind # start bitcoind sudo systemctl status bitcoind # check bitcoind status 
If everything worked, status should output the following:
● bitcoind.service - Bitcoin daemon Loaded: loaded (/etc/systemd/system/bitcoind.service; enabled; vendor preset: enabled) Active: active (running) since jeu. 2018-08-23 21:17:41 CEST; 5s ago Process: 5218 ExecStart=/uslocal/bin/bitcoind -conf=/home/larafale/.bitcoin/bitcoin.conf (code=exited, status=0/SUCCESS) Main PID: 5219 (bitcoind) CGroup: /system.slice/bitcoind.service └─5219 /uslocal/bin/bitcoind -conf=/home/larafale/.bitcoin/bitcoin.conf 
The bitcoind service is active and will automatically restart on statup/crash. Wait a couple minutes until the bitcoin-cli getblockchaininfo command returns the chain status. You can also query the rest interface by opening http://nodeIP:8332/rest/chaininfo.json in your browser.

Conclusion

You now have a full Bitcoin core node running on it's own. What's next ? Well I never blogged before, this is the first time I am outsourcing some of my work. I'm a passionnate enginner working on all kind of technologies. I've been dedicating half of my time to Bitcoin for the last 2 years already, so if this guide was usefull and want to go deeper , just let me know, depending on the feedback I get, i'll consider outsourcing more interesting work. For example next post could be about setting up an Electrum Server so you can safely use SPV wallets trusting your own fullnode.
Also I'm currently working on a trustless bitcoin payment processor called 8333, make sure you follow @_8333_ on twitter. I think I will release the project end of 2018. Ping me if interested.
The best way you can show support is via Bitcoin : 16FKGPiivpo3Z7FFPLdkoVRcV2ASBc7Ktu
submitted by larafale to Bitcoin [link] [comments]

Dev Idea; "more" than a cryptocurrency ? perhaps a platform ?

Hello everyone, long time lurker, first time poster.
So, I have been wondering what could help drive adoption of pivx. I mean, I like it (otherwise I wouldn't be holding it) but I feel that it could be so much more than "only" a cryptocurrency. What do I mean by that ?
Look at Ethereum (sorry). It's ostensibly a currency, but the true power comes from the fact that it's sort of like a gateway drug to everything else. Ipfs, Swarm, Whisper, etc. It's also okay as a currency, don't get me wrong, but it also enables a platform and infrastructure which uses eth/gas/wei/etc. I believe that this is the reason for it's uptake, even in the face of bitcoin and friends.
How do we get pivx to be, then, something more ? The obvious answer would be tokens/erc20/erc223 but, I don't think that's where the power lies. I believe the platform is more because the smart contracts allow communication between endpoints. It's not the fact that anyone can write solidity that's important, it's that two remote people can communicate via the contract. In my (possibly idiotic) view, clumsily. It seems to be almost incidental to the idea of the contract.
I am therefore wondering, and proposing if it is not possible at the moment, the ability for pivx packets/transactions to have a small 'user generated' payload. Nothing huge. Even in the range of like 1k would be enough. What does this get us ?
It allows things like usernames/passwords/urls or commands to be PGP encrypted and sent to a wallet. Then the pivx-cli can do something and return to the caller the result. This can, of course, use lightning network and do off chain settlement as well. It basically allows arbitrary rpc calls to custom backends using the ledger as "proof of request".
I hope this makes sense, if not, then I do apologize in advance. I am jst thinking that even basic payloads would allow the sort of NATS/RabbitMQ style of communication to happen. When that starts flowing across the network (in a way that Ethereum sort of does) then good things start to happen (pivx-ipfs for example ?)
submitted by brussell1972 to pivx [link] [comments]

How To Find Private Key Of Bitcoin Daimond Wallet  Bitcoin Key Aircrack-ng CLI (Command Line Interface) on windows Solutions To Common CIV Wallet Problems Windows Learning Bitcoin 4 - Bitcoin Command Line Helper - Part 3 Bitcoin JSON-RPC Tutorial 4 - Command Line Interface

This past Friday, 21 freed the source code for the 21 CLI, a command line interface for Bitcoin written in Python. You can read 21sannouncement here to learn more about what the 21 CLI can do, and youcan find the source code for the 21 CLI here . The bitcoin core client currently comes bundled with a Remote Procedure Call (RPC) client tool called bitcoin-cli. In our Bitcoin wire protocol 101 however, we demonstrated how you can communicate over the raw TCP bitcoin socket by using existing command line based tools. The following NwConsole commands are useful when interacting with NetWitness Server Core services: feed: Enables you to create and work with feed files.; makepcap: Converts Packet database (DB) files to PCAP.; packets: Retrieves packets or logs from the logged in service.; hash: Creates or verifies hashes of database files.; The following sections as well as the NwConsole help and topic In this guide, we’re going to configure a Cisco switch through the command-line interface (CLI) with the open-source SSH/Telnet client PuTTY (although you can use another tool if you prefer). If for any reason putty is not an option for your setup, you can get similar results with a PuTTY alternative . The bitcoin core client currently comes bundled with a Remote Procedure Call (RPC) client tool called bitcoin-cli. In our Bitcoin wire protocol 101 however, we demonstrated how you can communicate over the raw TCP bitcoin socket by using existing command line based tools.

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How To Find Private Key Of Bitcoin Daimond Wallet Bitcoin Key

The bitcoin client contains a hardcoded list of well known DNS servers which can return a list of ip addresses of bitcoin nodes. Alternatively, the bitcoin client can be given a static ip address ... Blockstream Director of Research Andrew Poelstra talks during Consensus: Distributed 2020 about Miniscript, a language for representing Bitcoin Scripts in a structured way, enabling efficient ... Commands to resync and reindex Civitas wallet: "C:\Program Files\Civitas\civitas-qt.exe" -reindex "C:\Program Files\Civitas\civitas-qt.exe" -resync Use code "hL0QlW" and get 3% off every purchase ... How To Find Private Key Of Bitcoin Daimond Wallet. How to Get Private Key of Bitcoin Wallet. In this tutorial we are going to get our private keys from the bitcoin core wallet. This only works ... Learning Bitcoin 4 - Bitcoin Command Line Helper - Part 3.

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