How to set up a secure offline savings wallet - Bitcoin Wiki

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Bitcoin Cold Storage: Easily create a bootable Ubuntu Live OS with MultiBit for completely offline storage

Bitcoin Cold Storage: Easily create a bootable Ubuntu Live OS with MultiBit for completely offline storage submitted by bitcoincoldstorage to Bitcoin [link] [comments]

X-POST from r/Bitcoin: [idea] Simple live bootable ubuntu iso for cold storage wallet

X-POST from Bitcoin. Currently the iso only has bitcoin support, but I have it prepped and basically ready to support ltc and ether. I have spent a few solid weeks on this and want to guage support before spending more time. Let me know what you all think.
Hey everyone,
I am wondering if anyone would be interested in a live, bootable, iso version of ubuntu which would make creating an air-gapped offline wallet much simpler for the average person?
I have one that i consider beta version which boots up and has a pdf with instructions and Electrum already installed and ready to create a wallet.
The iso has networking disabled to ensure it is airgapped, so the user does not have to physically unplug it, or if they forget to they are still safe. It has unity hidden so it is simple and basic such that even non-linux users should be able to follow.
I chose electrum because you can use seed words and create an online watcher wallet to be able to request money and monitor the balance without compromising the security of the cold storage wallet.
Would any of you be interested in that? Are there any tips or suggstions on anything that could be added to make it easier?
submitted by why_a_penny to CryptoCurrency [link] [comments]

Cold storage question: Ledger and Ubuntu /r/Bitcoin

Cold storage question: Ledger and Ubuntu /Bitcoin submitted by BitcoinAllBot to BitcoinAll [link] [comments]

Cold storage question: Is it secure enough to leave the computer connected online for the installation of Ubuntu and Electrum? (x-post from /r/BitcoinWallet/comments/6d4a4y/cold_storage_question_is_it_secure_enough_to/) /r/Bitcoin

Cold storage question: Is it secure enough to leave the computer connected online for the installation of Ubuntu and Electrum? (x-post from /BitcoinWallet/comments/6d4a4y/cold_storage_question_is_it_secure_enough_to/) /Bitcoin submitted by BitcoinAllBot to BitcoinAll [link] [comments]

[idea] Simple live bootable ubuntu iso for cold storage wallet /r/Bitcoin

[idea] Simple live bootable ubuntu iso for cold storage wallet /Bitcoin submitted by BitcoinAllBot to BitcoinAll [link] [comments]

Mac running Ubuntu via live usb (cold storage) isn't shutting down properly! Bitcoins in danger? /r/Bitcoin

Mac running Ubuntu via live usb (cold storage) isn't shutting down properly! Bitcoins in danger? /Bitcoin submitted by BitcoinAllBot to BitcoinAll [link] [comments]

cold storage compatibility issues

Hello, I have been a fan of electrum because of its offline capability. I like that I can use Bitcoin while storing my private keys on a computer that has the wifi card removed and hot glue stuffed in the Ethernet port. However it looks like maybe the electrum developers have over-promised and under-delivered in this regard. Or, maybe they simply do not have the time, energy, resources to make this work in real life.
Let me explain. I have an old-ass computer that is running Ubuntu 12 (precise), this computer has electrum 2.5.4 installed with a cold-storage wallet that has my private key.
I want to send some bitcoin from that address to a new wallet on my desktop so I can spend the bitcoin. So I installed electrum (newest version 3.3.8) on my desktop, imported the bitcoin address, and created a transaction. Then I sent the transaction to the offline computer out of band, and verified that the out-of-band transmission worked by comparing the hash of the txn file on both the offline and online machines. Then I tried to open the txn file on the offline machine with Electrum 2.5.4. Well, guess what, it didn't work. Electrum 2.5.4 printed to the console:
Traceback (most recent call last):
File "/uslocal/lib/python2.7/dist-packages/Electrum-2.5.4-py2.7.egg/electrum_gui/qt/", line 2261, in do_process_from_file
File "/uslocal/lib/python2.7/dist-packages/Electrum-2.5.4-py2.7.egg/electrum_gui/qt/", line 577, in show_transaction
show_transaction(tx, self, tx_desc)
File "/uslocal/lib/python2.7/dist-packages/Electrum-2.5.4-py2.7.egg/electrum_gui/qt/", line 37, in show_transaction
d = TxDialog(tx, parent, desc, prompt_if_unsaved)
File "/uslocal/lib/python2.7/dist-packages/Electrum-2.5.4-py2.7.egg/electrum_gui/qt/", line 48, in __init__
File "/uslocal/lib/python2.7/dist-packages/Electrum-2.5.4-py2.7.egg/electrum/", line 523, in deserialize
d = deserialize(self.raw)
File "/uslocal/lib/python2.7/dist-packages/Electrum-2.5.4-py2.7.egg/electrum/", line 454, in deserialize
d[inputs] = list(parse_input(vds) for i in xrange(n_vin))
OverflowError: Python int too large to convert to C long
That's pretty frustrating, the first thing I tried was to install Electrum 2.5.4 on my Desktop and try to create a new unsigned transaction with Electrum 2.5.4. However, this is a no-go because old versions of Electrum cannot connect to Electrum servers any more. So I have to try to update the Electrum on the Offline computer. But I'm not even sure if this is possible considering how ubuntu 12 it's definitely out of support at this point and the offline computer does not even have python3 installed, let alone the GTK stuff or whatever is probably required to run Electrum.
I'm starting to regret choosing a GUI-based wallet for my offline storage considering how hard it is to actually use this and how it simply melts over time... even just 5 years is is enough time to completely melt and destroy this software and make it un-usable. Time Catches All. So now I have to go out and buy a new computer that can run the updated OS, so I can install the new version of Electrum, so I can access my bitcoin.
Do you have any other ideas? Has anyone else experienced anything like this?
submitted by throwaway_23f32f to Electrum [link] [comments]

Groestlcoin 6th Anniversary Release


Dear Groestlers, it goes without saying that 2020 has been a difficult time for millions of people worldwide. The groestlcoin team would like to take this opportunity to wish everyone our best to everyone coping with the direct and indirect effects of COVID-19. Let it bring out the best in us all and show that collectively, we can conquer anything.
The centralised banks and our national governments are facing unprecedented times with interest rates worldwide dropping to record lows in places. Rest assured that this can only strengthen the fundamentals of all decentralised cryptocurrencies and the vision that was seeded with Satoshi's Bitcoin whitepaper over 10 years ago. Despite everything that has been thrown at us this year, the show must go on and the team will still progress and advance to continue the momentum that we have developed over the past 6 years.
In addition to this, we'd like to remind you all that this is Groestlcoin's 6th Birthday release! In terms of price there have been some crazy highs and lows over the years (with highs of around $2.60 and lows of $0.000077!), but in terms of value– Groestlcoin just keeps getting more valuable! In these uncertain times, one thing remains clear – Groestlcoin will keep going and keep innovating regardless. On with what has been worked on and completed over the past few months.

UPDATED - Groestlcoin Core 2.18.2

This is a major release of Groestlcoin Core with many protocol level improvements and code optimizations, featuring the technical equivalent of Bitcoin v0.18.2 but with Groestlcoin-specific patches. On a general level, most of what is new is a new 'Groestlcoin-wallet' tool which is now distributed alongside Groestlcoin Core's other executables.
NOTE: The 'Account' API has been removed from this version which was typically used in some tip bots. Please ensure you check the release notes from 2.17.2 for details on replacing this functionality.

How to Upgrade?

If you are running an older version, shut it down. Wait until it has completely shut down (which might take a few minutes for older versions), then run the installer.
If you are running an older version, shut it down. Wait until it has completely shut down (which might take a few minutes for older versions), run the dmg and drag Groestlcoin Core to Applications.

Other Linux


Download the Windows Installer (64 bit) here
Download the Windows Installer (32 bit) here
Download the Windows binaries (64 bit) here
Download the Windows binaries (32 bit) here
Download the OSX Installer here
Download the OSX binaries here
Download the Linux binaries (64 bit) here
Download the Linux binaries (32 bit) here
Download the ARM Linux binaries (64 bit) here
Download the ARM Linux binaries (32 bit) here


ALL NEW - Groestlcoin Moonshine iOS/Android Wallet

Built with React Native, Moonshine utilizes Electrum-GRS's JSON-RPC methods to interact with the Groestlcoin network.
GRS Moonshine's intended use is as a hot wallet. Meaning, your keys are only as safe as the device you install this wallet on. As with any hot wallet, please ensure that you keep only a small, responsible amount of Groestlcoin on it at any given time.





ALL NEW! – HODL GRS Android Wallet

HODL GRS connects directly to the Groestlcoin network using SPV mode and doesn't rely on servers that can be hacked or disabled.
HODL GRS utilizes AES hardware encryption, app sandboxing, and the latest security features to protect users from malware, browser security holes, and even physical theft. Private keys are stored only in the secure enclave of the user's phone, inaccessible to anyone other than the user.
Simplicity and ease-of-use is the core design principle of HODL GRS. A simple recovery phrase (which we call a Backup Recovery Key) is all that is needed to restore the user's wallet if they ever lose or replace their device. HODL GRS is deterministic, which means the user's balance and transaction history can be recovered just from the backup recovery key.



Main Release (Main Net)
Testnet Release


ALL NEW! – GroestlcoinSeed Savior

Groestlcoin Seed Savior is a tool for recovering BIP39 seed phrases.
This tool is meant to help users with recovering a slightly incorrect Groestlcoin mnemonic phrase (AKA backup or seed). You can enter an existing BIP39 mnemonic and get derived addresses in various formats.
To find out if one of the suggested addresses is the right one, you can click on the suggested address to check the address' transaction history on a block explorer.


Live Version (Not Recommended)



ALL NEW! – Vanity Search Vanity Address Generator

NOTE: NVidia GPU or any CPU only. AMD graphics cards will not work with this address generator.
VanitySearch is a command-line Segwit-capable vanity Groestlcoin address generator. Add unique flair when you tell people to send Groestlcoin. Alternatively, VanitySearch can be used to generate random addresses offline.
If you're tired of the random, cryptic addresses generated by regular groestlcoin clients, then VanitySearch is the right choice for you to create a more personalized address.
VanitySearch is a groestlcoin address prefix finder. If you want to generate safe private keys, use the -s option to enter your passphrase which will be used for generating a base key as for BIP38 standard (VanitySearch.exe -s "My PassPhrase" FXPref). You can also use VanitySearch.exe -ps "My PassPhrase" which will add a crypto secure seed to your passphrase.
VanitySearch may not compute a good grid size for your GPU, so try different values using -g option in order to get the best performances. If you want to use GPUs and CPUs together, you may have best performances by keeping one CPU core for handling GPU(s)/CPU exchanges (use -t option to set the number of CPU threads).





ALL NEW! – Groestlcoin EasyVanity 2020

Groestlcoin EasyVanity 2020 is a windows app built from the ground-up and makes it easier than ever before to create your very own bespoke bech32 address(es) when whilst not connected to the internet.
If you're tired of the random, cryptic bech32 addresses generated by regular Groestlcoin clients, then Groestlcoin EasyVanity2020 is the right choice for you to create a more personalised bech32 address. This 2020 version uses the new VanitySearch to generate not only legacy addresses (F prefix) but also Bech32 addresses (grs1 prefix).




Remastered! – Groestlcoin WPF Desktop Wallet (v2.19.0.18)

Groestlcoin WPF is an alternative full node client with optional lightweight 'thin-client' mode based on WPF. Windows Presentation Foundation (WPF) is one of Microsoft's latest approaches to a GUI framework, used with the .NET framework. Its main advantages over the original Groestlcoin client include support for exporting blockchain.dat and including a lite wallet mode.
This wallet was previously deprecated but has been brought back to life with modern standards.


Remastered Improvements



ALL NEW! – BIP39 Key Tool

Groestlcoin BIP39 Key Tool is a GUI interface for generating Groestlcoin public and private keys. It is a standalone tool which can be used offline.



Linux :
 pip3 install -r requirements.txt python3 bip39\ 


ALL NEW! – Electrum Personal Server

Groestlcoin Electrum Personal Server aims to make using Electrum Groestlcoin wallet more secure and more private. It makes it easy to connect your Electrum-GRS wallet to your own full node.
It is an implementation of the Electrum-grs server protocol which fulfils the specific need of using the Electrum-grs wallet backed by a full node, but without the heavyweight server backend, for a single user. It allows the user to benefit from all Groestlcoin Core's resource-saving features like pruning, blocks only and disabled txindex. All Electrum-GRS's feature-richness like hardware wallet integration, multi-signature wallets, offline signing, seed recovery phrases, coin control and so on can still be used, but connected only to the user's own full node.
Full node wallets are important in Groestlcoin because they are a big part of what makes the system be trust-less. No longer do people have to trust a financial institution like a bank or PayPal, they can run software on their own computers. If Groestlcoin is digital gold, then a full node wallet is your own personal goldsmith who checks for you that received payments are genuine.
Full node wallets are also important for privacy. Using Electrum-GRS under default configuration requires it to send (hashes of) all your Groestlcoin addresses to some server. That server can then easily spy on your transactions. Full node wallets like Groestlcoin Electrum Personal Server would download the entire blockchain and scan it for the user's own addresses, and therefore don't reveal to anyone else which Groestlcoin addresses they are interested in.
Groestlcoin Electrum Personal Server can also broadcast transactions through Tor which improves privacy by resisting traffic analysis for broadcasted transactions which can link the IP address of the user to the transaction. If enabled this would happen transparently whenever the user simply clicks "Send" on a transaction in Electrum-grs wallet.
Note: Currently Groestlcoin Electrum Personal Server can only accept one connection at a time.



Linux / OSX (Instructions)


UPDATED – Android Wallet 7.38.1 - Main Net + Test Net

The app allows you to send and receive Groestlcoin on your device using QR codes and URI links.
When using this app, please back up your wallet and email them to yourself! This will save your wallet in a password protected file. Then your coins can be retrieved even if you lose your phone.



Main Net
Main Net (FDroid)
Test Net


UPDATED – Groestlcoin Sentinel 3.5.06 (Android)

Groestlcoin Sentinel is a great solution for anyone who wants the convenience and utility of a hot wallet for receiving payments directly into their cold storage (or hardware wallets).
Sentinel accepts XPUB's, YPUB'S, ZPUB's and individual Groestlcoin address. Once added you will be able to view balances, view transactions, and (in the case of XPUB's, YPUB's and ZPUB's) deterministically generate addresses for that wallet.
Groestlcoin Sentinel is a fork of Groestlcoin Samourai Wallet with all spending and transaction building code removed.




UPDATED – P2Pool Test Net



Pre-Hosted Testnet P2Pool is available via


submitted by Yokomoko_Saleen to groestlcoin [link] [comments]

How to setup a secure wallet?

I kinda know the basics about bitcoin. But im iffy on the "creating a wallet" part. I want to do it on an encrypted machine or make sure i have....honestly i don't know what im doing. I want it to be secure but im not sure if I trust my phone. I could just be paranoid. does anyone have an idiot proof guide or video of how to goto a physical location and buy some then put it in my wallet for use? I think i want to just use a laptop live cd. idk. also what is the best exchange for canada to use to monitor value?
sorry very tired.
submitted by CalvinsCuriosity to BitcoinBeginners [link] [comments]

First home server; will my plan accomplish my goals?

I'm planning to build my first home server, and I'd love some feedback on my plans before I buy all the hardware. Can you folks help me with some feedback?
What I Want to Do with My Hardware
Current Plan
Currently Planned Hardware
Type Item Price
CPU Intel - Xeon E5-2660 V2 2.2 GHz 10-Core Processor $192.97 @ PCM
CPU Intel - Xeon E5-2660 V2 2.2 GHz 10-Core Processor $192.97 @ PCM
CPU Cooler Noctua - NH-D14 SE2011 CPU Cooler $89.99 @ Amazon
CPU Cooler Noctua - NH-D14 SE2011 CPU Cooler $89.99 @ Amazon
Thermal Compound Thermal Grizzly - Aeronaut 3.9 g Thermal Paste $11.59 @ Amazon
Motherboard ASRock - EP2C602-4L/D16 SSI EEB Dual-CPU LGA2011 Motherboard $481.98 @ Newegg
Memory Crucial - 32 GB (2 x 16 GB) Registered DDR3-1866 Memory $159.99 @ Amazon
Storage Western Digital - Blue 1 TB 2.5" Solid State Drive $114.89 @ OutletPC
Storage Western Digital - Blue 1 TB 2.5" Solid State Drive $114.89 @ OutletPC
Storage Western Digital - Red Pro 8 TB 3.5" 7200RPM Internal Hard Drive $140.00
Storage Western Digital - Red Pro 8 TB 3.5" 7200RPM Internal Hard Drive $140.00
Storage Western Digital - Red Pro 8 TB 3.5" 7200RPM Internal Hard Drive $140.00
Storage Western Digital - Red Pro 8 TB 3.5" 7200RPM Internal Hard Drive $140.00
Storage Western Digital - Red Pro 8 TB 3.5" 7200RPM Internal Hard Drive $140.00
Storage Western Digital - Red Pro 8 TB 3.5" 7200RPM Internal Hard Drive $140.00
Video Card Asus - GeForce GTX 1060 6GB 6 GB Strix Video Card $359.98 @ B&H
Case Phanteks - Enthoo Pro Tempered Glass ATX Full Tower Case $122.00 @ Amazon
Power Supply Corsair - HX Platinum 750 W 80+ Platinum Certified Fully Modular ATX Power Supply $99.99 @ Newegg
Sound Card Creative Labs - Sound Blaster Z 30SB150200000 OEM 24-bit 192 kHz Sound Card $90.77 @ OutletPC
Prices include shipping, taxes, rebates, and discounts
Total (before mail-in rebates) $3002.00
Mail-in rebates -$40.00
Total $2962.00
Hardware Notes
Other Notes
My main question is: will this hardware and software setup accomplish my goals?
My secondary question is: is any of my hardware unnecessary for my goals? are there better ways to eat this Reese's?
Thanks so much for all the help in advance, I've learned so much from this subreddit (and DataHoarding) already!
submitted by therightrook to homelab [link] [comments]

Security for Bitcoin Core full master node

I have been running a Bitcoin Core full master node for several months now on an Ubuntu VM. I have never used the wallet on the node but today I transferred .0025 BTC to it to test. I have opened port 8333 and it is working great. My question -- Are there any special security considerations I need to take to secure this Ubuntu VM?
Note: I normally use a Ledger Nano S for my cold storage. Just testing the wallet on the node and I was curious about this.
submitted by dribblesonpillow to Bitcoin [link] [comments]

Atomic Wallet - The best way to buy crypto using bank card

Atomic Wallet is created to make day-to-day cryptocurrency usage more secure while bringing the best customer experience to both customers and investors. It is a suitable and protean decentralized effect for the custody-free cryptocurrency trading, it is a new type of decentralized cross-blockchain exchange. This platform is based on a unique proprietary engine designed to solve its assigned tasks. Atomic Wallet is the simplest way to connect buyers and sellers within a decentralized network, it also provides a powerful in-demand service which allows users to reduce efforts spent on managing digital assets.
Atomic Wallet is a multi-cryptocurrency, multi-purpose, custody free Cold Storage wallet. It supports over 300 assest and recently they have added a new feature through which you can buy Bitcoin/Altcoins using a Bank Card. Atomic wallet also comes with features like Atomic Swap and P2P Exchange.
How to Buy?
First of all you need to download the desktop version of Atomic Wallet.
Atomic Wallet supports Windows, macOS, Ubuntu, Debian and Fedora.
You can download it here
After you have Downloaded the wallet and Installed on your desktop, click on CREATE WALLET and then set password for your wallet. After you have setup a password, you will see a list of menus on the left hand side of your wallet. Below Exchange and above History, there will be Buy cryptos.

In the next screen as shown below, you will see amount in dollars in the left and on the right Bitcoin value in Dollars. Bitcoin is shown as the default crypto to be bought on this screen. Currently through Atomic Wallet you can buy five cryptocurrency and they are Bitcoin, Bitcoin cash, Litecoin, Ethereum and Ripple.
The minimum amount is $50 for buying any of these five cryptos. Both debit/credit Visa and Mastercards are supported. As soon as the purchase is confirmed the cryptos get credited into your wallet.
I have been using this method of buying cryptocurrency for a long time, because I believe that this is the best and most convenient option to use Fiat money for investing in cryptocurrency.
My conclusion
Atomic wallet is a wallet that I recommend for everyone to use, the interface is so beautiful and user friendly. You can download the wallet on any operating System and the mobile application is almost ready. The Atomic wallet Coin is a great coin that is worthy of investment.
Do you wanna know about Atomic Wallet?
Website >>>
White Paper >>>
Twitter >>>
Facebook >>>
My forum username >>> Elena_che
Profile link >>>;u=2037390
ETH >>> 0x43Fa282f35209f4aE6797fDae648375b626f5af2
submitted by xounmetel to Crypto_General [link] [comments]

Dogecoin Stack Exchange Day 26 : Sabotage

On Saturday we had 20 questions with a score of ten or more.
Today we have 10 questions with a score of ten or more.
None of the dogecoin stack followers have downvoted any questions. Maybe an external moderator downvoted questions in the proposal? Or a group of people decided to wihdraw their votes? Why? Such scare! Very conspir.. plz up.!
Status 69 Followers 10 questions with a score of 10 or more
*Required to start comittment phase
20 more questions with a score of 10 or more
A lot of followers haven't voted, if you haven't voted, plz vote. If you haven't signed up, plz sign.
Current Question List
Question Votes
How can I setup a Dogecoin wallet? 14
What are the best ways to back up my wallet? 12
What is "cold storage"? Why is it better for long-term holding? 11
How can I buy Dogecoin? 11
I am trying to install dogecoin core on ubuntu how do i install the dependancies? 10
How can Dogecoin be used outside of Internet transactions? 10
How can I "bootstrap" to speed up the process of syncing up with the Dogecoin blockchain? 10
How can I sell my stuff for dogecoins? 10
Can an old, unencrypted core wallet backup be used to move dogecoins out of that same wallets currently encrypted core wallet? 10
How does merged mining work with litecoin? 10
How do I backup my wallet, and how do I restore form the backup? 9
How to setup a dogecoin public node? 9
How do I get dogecoins? 9
What is a public node? 9
How do i import a existing wallet.dat file from a previous dogecoin installation 9
Why are online wallets considered bad? 9
What would happen to the dogecoin hash rate if litecoin became unpopular? 9
How long does it take for the dogecoin wallet to sync with the dogecoin blockchain? 9
Where can I buy things with doge? 9
How do Dogecoin transaction fees work? 8
What is Dogecoin mining, and how do I begin? 7
Is there a way to tip videos on youtube with dogecoin? 4
Is there a limit on how many Dogecoins can ever be mined/exist? 3
What price would dogecoin need to be in order for the mining rewards to cover the cost of electricity? 3
What is "sweeping" from one wallet to another and why is it important? 1
How can Dogecoin avoid the long transaction wait times and high fees that Bitcoin is currently experiencing? 1
What is the best (most efficient) way to mine Doge? 1
How do I set up Dogecoinfold? 1
What are three reasons to use Dogecoin that the average, non-technical user would find compelling? 1
Is it possible to have two Dogecoin core wallets running on the same computer at the same time? 1
Is there a roadmap for Dogecoin's future? 0
Who are the devs? 1
What exactly is a shibe? 1
How can we help to boost DogeCoin as an accepted Currency? 1
Can I recover my dogecoins if I accidentally have deleted my wallet? 1
What is it about the Dogecoin community that makes it so wow? 1
What happened to the dogecoin foundation? 0
Who owns and runs the website? 0
Does segregated witness implementation reduce traceability on the blockchain? 0
What is the purpose of cryptocurrency? 0
Can I mine dogecoin on my laptop? 0
What programming language is used for the dogecoin core? 0
Let's go
... to the moooon!
edit This back from Stack Exchange
User does not have to follow the proposal in order to vote on the sample questions. As the faq says, any user with 150 rep on Area 51 can downvote any example question.
So we're being sabotaged and we don't even know who is doing it... At least three people and none are followers. Such sad, very disappoint.
submitted by mcsen2163 to dogecoin [link] [comments]

Here are Security Tips to Generate Cold Storage Securely

Security is a spectrum.
The amount of effort, cost, and paranoia dedicated to generating cold storage should be proportional to the value being protected and its significance to the holder both now and potentially in the future.
To avoid loss of funds, here are some tips to generate cold storage as securely as possible:
submitted by cryptostorage to Bitcoin [link] [comments]

Here are Security Tips to Generate Cold Storage Securely

Security is a spectrum.
The amount of effort, cost, and paranoia dedicated to generating cold storage should be proportional to the value being protected and its significance to the holder both now and in the future.
Here are some tips to generate cold storage as securely as possible:
submitted by cryptostorage to btc [link] [comments]

16 Finally going to be part of the 21 Million Club

Warning skip to second paragraph for the more important part I first heard of Bitcoin in an issue of the Linux Format, I said to myself oh some stupid internet money better pass. This was in 2010. I was a teenager first learning about Computer Science by just playing around with computers, tinkering with some languages and some very small projects that never lead to anything. Fast forward to Freshman year in High School. Bitcoin hits $1100. Our business class is discussing it, I was skeptical of it, and the class eventually convinced itself as some stupid fad. We believed it was some Japanese company or something. We couldn't believe it was decentralized, we had to believe someone was behind it. Now fast forward to Sophomore year. I am sitting in my Comp Sci class completely bored, and after watching Alan Turing in that enigma movie, really good movie by the way, I decided I should make my own cipher. I played with a Python console and simulated the Enigma(I read it was secure(except it was weakened, not broken, by the fact that a letter couldn't encrypt to itself, and there were flaws with the German commanders who used it, it was 99% human error that took down the Enigma). I said this is pretty nice. I think I got a keyspace of ~73 bits, I'm sure there were flaws that probably weakened that keyspace and the algorithm, one error I faced was that when one rotor would flick and another does and the net change is 0 you have a repetition, but I wasn't able to kink that out and just added another rotor. I begin playing with cryptography, I passed the class with flying colors while still doing nonsense for around 80% of the class time, I've been programming since second grade(thanks to a great influence who got me in early). I played with RSA, Diffie-Hellman, and all these, then I learned of Bitcoin. Nearly every book I read had a reference to Bitcoin(I had the luxury of pirating textbooks and finding parts that I would like, a few I had to buy). Then I learned of Elliptic Curves. I couldn't figure it out for a long time. RSA took me maybe two weeks to implement. ECDSA is something I still barely understand. I bought a book on it, no help, it doesn't do enough to explain inverses in a finite field, and other topics I couldn't grasp. I'm still playing with it, I implemented a few functions on an elliptic curve, I couldn't do a few others, I can't derive the order of a field etc, but I can do point addition and a few other things. Let's just say I went really overboard and became a Bitcoin enthusiast in maybe 9 months. I lurk on this subreddit probably daily now.
Now I finally am becoming part of the 21 Million Club. I saved some $300 and will be going to CVS to buy a money order tomorrow to buy an entire Bitcoin. I generated some sort of Cold Storage on a Ubuntu machine(online but pretty damn sure I'm not compromised, I've held around .8 BTC earlier this year and nothing). I deleted the private keys etc, I made two paper wallets, one unencrypted, which will be kept in my house, and one encrypted one which I will hope to find some where safe to keep just in case there ever is a fire in my house or whatever. I took a picture, I also have a bunch of other paperwallets that all they are missing are hologram stickers, the ones worth less than $10 I just taped up, I keep these just in case someone is interested enough in Bitcoin for me to give them some, I've given out about 4. I mean I felt very excited to finally join the 21 Million Club and just had to post lol. To the moon. EDIT: It didn't post with my photo. 1 BTC in Cash unfortunately(for tonight) TLDR: Excited kid turns into a Bitcoin enthusiast, goes out of his way to buy and entire Bitcoin. Addition: I can and probably should work by now, but I decided that this summer I was just going to work on sports, and more computer science, so that's how it went.
submitted by justinba1010 to Bitcoin [link] [comments]

Should I buy this plastic wallet?

So, I've seen the suggestions. For future reference I'll list them:
You were very helpful! Thanks a lot guys!
Hello! I've been lurking this sub for quite a while. And while I am still very confused on how Bitcoin works, technically speaking, I'd like to jump to it as soon as possible.
I'd rather hold some sort of card or something physical as I'm used to. Risk of losing it should be smaller too, I guess.
After some researching, I've found this on Ebay.
submitted by Malakute to Bitcoin [link] [comments]

Two problems with vSphere 6 on Intel NUC Skull Canyons

Hey all, hopefully this post belongs here. I'm running 2 Intel NUC Skull Canyons ( at home.
Using 32-GB RAM in each:
Using 1TB Storage in each: They are both using the free version of vSphere 6 from vmware's site.
I run vSphere from USB thumb drives and use Storage Pools on the SSDs linked above. I've seen recommendations to install vSphere on an SD card but I never read if this was an advantage over USB thumb drive.
Basically one vSphere runs a Windows Server where I just try random homelab crap like running DHCP and DNS and more recently Plex media server along with a Ubuntu server for some home automation stuff like Home Assistant. Nothing too taxing in my opinion, and there's plenty of room for running more VMs.
The other one is running various Windows 10 boxes for work-related and hobby development stuff.
In both cases, I'm not running render farms or mining bitcoins or anything that I can think is too taxing...
They've been running about 9 months or so now. For the most part, they have been reliable. I've experienced uptimes of up to 45 days.
Problem #1: At certain times, I've experienced issues that only a cold reboot (via hard power off/on) will address. All VMs become unresponsive to SSH/RDP, and while the vSphere web client will load the login screen, I will get a login timeout. I can usually ssh to the hypervisor but will be unable to reboot via command. I see some vmkernel griping in the logs about storage i/o (re)attempts (I'll try to copy and paste this later) but I have no idea of knowing if this is just typical log spam or part of the issue. This seems to happen more often if I am running more than 2 or so VMs. I can't say for sure if this is happening more frequently because of bad h/w, or if it's because I'm doing more stuff in the VMs.
Issue #2: One of the USB thumbdrives running vSphere crapped out on me last week, so I re-installed the installer with Rufus and let the install install back onto itself, and I while the install worked fine, now the vSphere web client is extremely slow and prone to timeouts. To be clear, I know the web client is kind of crappy in general, but my second vSphere on the SAME h/w config and versions does not have this symptom. Does this sound like perhaps a USB controller issue? I tried multiple thumb drives to no avail. The VMs themselves run snappy.
Any advice I would appreciate, even if it's a simple "your hardware is shit" - (I picked the NUCs because they are small and quiet.)
submitted by entmike to homelab [link] [comments]

Isnt this weird?

When I first got into bitcoin the community was extremely paranoid when it came to storing bitcoin. Everyone recommended using offline airgapped computers, running ubuntu booted off cd-rom and with the hard-drive removed before hand to create paper wallets. There was great importance placed on never diplaying your private key to an online machine.
But with ethereum everyone is recommending MEW, all tutorials are running while ONLINE. Make the keystore file while connected, store eth and erc20 tokens while connected, access keystore file and send tokens while connected.
Newbies that come to ethereum, who may disregard bitcoin and dont learn the basics, are being told to do everything online.
This is massively different from the bitcoin communities mindset when it comes to storage.
I mean, if at any point from creating the keys to storing eth to sending eth or even just using MEW to view your balance, if your computer is compromised in any way you risk loosing your funds.
Does this not concern anyone in the ethereum community?
EDIT: as no one seems to understand my point, this is my question. Why is knowledge of cold storage security not a priority in the ethereum community, taking into account many newbies may find ethereum without first learning about bitcoin.
EDIT 2: after having to actually deal with people getting defensive over my legitimate concerns it appears my question has been answered.
This community (everyone making youtube tutorials) happily sacrifices safe offline cold storage in preference of usability. Beacuse apparently every newbie will only invest small amounts so it doesnt matter if they loose it. And usability is way more important than safe storage.
submitted by slvbtc to ethereum [link] [comments]

How to disappear. Cryptocurrency wallets.

A paper wallet.
Privacy is a form of power. Everyone has unalienable right to keep their personal and financial secrets, to have autonomy and control over their lives. Cryptocurrency became the answer to a long-standing problem with finance and freedom. Obviously, digital currency requires a different approach, particularly when it comes to acquiring and storing it. Bitcoin wallet is the equivalent of a physical wallet for transactions with Bitcoin. It stores a collection of secret keys which let you access the bitcoin address and, accordingly, your funds.
Cryptocurrency wallets can be digital and physical, online or offline. Hardware Bitcoin wallets and paper wallets are physical. They are meant to be used offline, such form of storage is known as cold storage.
A PAPER WALLET is a document which contains a public address that can be used to receive Bitcoins and a private key, which allows you to spend or transfer Bitcoins stored at that address. Paper wallets, due to the their similarity to paper currency, are usually considered best for beginners, and especially for those who have been handling fiat cash and credit cards for most of their lives.
Paper wallets can be created and used on any computer with a standard Web browser and are often printed in a form of QR-codes so that you can quickly scan them and add the keys to a software wallet to make a transaction. The main benefit of a paper wallet is that the keys are not stored digitally anywhere, which makes it completely immune to hacker attacks. Paper wallets put the responsibility of security right in the hands of their owner and the possibility of losing all coins simply by confiding in another party becomes impossible.
However, some precautions when creating a wallet still need to be taken. Obviously, before generating a paper wallet you need to make sure that no one is watching you do it. To rule out the risk of any spyware monitoring your activities, it is recommended to use a clean operating system, such as Ubuntu, running from a USB flash drive or DVD. Furthermore, once the paper wallet is set up, the website code should be able to run offline, which allows you to disconnect from the Internet before actually generating the keys. Finally, use a printer that is not connected to a network.
Cryptocurrency paper wallets offer a useful solution to the problem of storing funds for later use. They are one of the easiest forms of cold storage to start using. However, one should always remember that they are printing valuable private information on a piece of paper.
submitted by Jambler_io to u/Jambler_io [link] [comments]

Time for a Game Plan

As we seem to be bouncing off some kind of bottom, with a backlog of good news about growth and capital, it feels like reality may be conspiring to set off another rise and for this I wanted to set out a game plan. Not a plan for making a shitload of money though that may be possible, a plan that has little to do with following every twist and turn of Bitcoin, but a plan that focuses on life and happiness. How can you survive a rise with some semblance of a normal life?
The price has been climbing for a week straight and while it could turn down any time, shit happens fast, and like an ER technician, you're going to need to react and depend on your mental preparedness to keep you from doing stupid things. You may be compelled to act in strange ways, not all of them positive. So these are some tips to survive another Bitcoin bubble, and Bitcoin itself on a personal, whole-life level.
  1. Keep a clear head. Yeah, I know, "Don't tell me what to do, man!" Quit doing whatever drugs you are doing and don't get into any new ones. During this time, increases may be adding thousands to your net worth in days, hours and minutes. Now, I don't know your particular relationship to money but each of us has a more complicated one than we can actively comprehend. Money is power. Time is money. It's heavy stuff. Time and bitcoins are things that, once wasted, you can't get back. When you find yourself with more money, even on paper it affects where you think you fit in the world, how you think of the future, what you can afford, your risk tolerance. I don't think most of us are setup to deal with so many things changing with that number so quickly. You will want a clear head to be able to follow whatever plan you setup and to deal with curveballs.
  2. Seek healthy ways to handle stress. This will reduce your chances of choosing less-healthy coping methods that sacrifice your intellectual clarity for short-term relief. Exercise. Meditate. Get a massage. Take up a hobby. Exercising the creative areas of your brain helps reduce, relieve, and process stress. Writing, coding, drawing, painting, sculpting, and cooking each provide an opportunity to do something new and to relieve tension. Carry a notebook to capture your ideas. Seek out challenging tasks. Spend time in natural settings with sunlight if you can find it.
  3. Keep your commitments. You don't need to calculate your net worth every hour. When the bubble is over and volatility reduces, you'll have normal life to deal with and you'll find money can't solve every problem it's possible to create during a fit of reckless exuberance. Keeping your committments means not allowing the market to reprioritize your schedule on short notice. People inevitably depend on you for things so keep doing those things. Trust takes years to build, seconds to break, and forever to repair. I speak from experience having effectively quit my job in a suboptimal way.
  4. Increase your security knowledge and improve your security practices. Any funds in online wallets should be minimized to just what is needed for trading. Reduce amounts stored in your own hot wallets to a minimum. Have a process to check and adjust this weekly or more often depending on just how much you're dealing with and your risk tolerance. Hacking attempts increase with the rise in price. 1 BTC sitting on a server at $200 is different than 1 BTC sitting on a server at $500 or $1000. The danger gloriously multiplies if one, ten, or one hundred BTC are currently within your comfort zone. Get a trezor or pick up an old laptop and repurpose it to run Tails or Ubuntu from a CD only (usually you can pull the hard drive and wifi card with just a screw driver). Prepare cold storage wallets, test them, and learn how to store them securely. Learn about BIP38, Shamir's secret sharing, encrypted disks, safes, and safe deposit boxes. If you can reduce your chances of being hacked, it's probably worth the time spent beefing up defenses.
  5. Prepare for taxation. Learn about capital gains tax. Besides federal or national capital gains tax, your state, province, county, or cell block may have additional tax to pay during profitable sales. Know your tax liability before you trade so you understand how much you need to set aside for the man.
  6. Be careful talking about your holdings or the profits you have tallied up on paper. When in doubt, don't talk about it. Techies are generally helpful people and when we think we've cracked the not-being-a-millionaire problem, it's very tempting to help others benefit. Unfortunately the ideal case, where you recommend someone "get in on this", they do, and then they sell for a quick profit seldom happens. More likely is that they buy at the top and hodl, blaming you for every nanosecond they are negative, possibly ending the nightmare by panic selling. And if they are wise enough to hold off on possibly purchasing at the peak, they'll either taunt you for being rich or will berate you for not acheiving stable lunar orbit. It's a no-win situation.
  7. Prepare for a rise ahead of time. Develop a version of this plan for yourself that you can follow or ignore with prejudice.
Hope it helps. Stay safe people.
submitted by zombiecoiner to Bitcoin [link] [comments]

Using Electrum and Bootable Ubuntu USB to Create a Secure Cold Storage Wallet

Here is a short guide that is hopefully newb friendly for creating a cold-storage wallet with Electrum. All you will need is at least one USB flash drive with at least 2 GB of free space, your PC, and pen & paper.
You will need The Universal USB Installer, as well as the Ubuntu .iso image file. Choose the 32 bit version to be safe. Download both, plug in your USB flash drive, and launch the installer. Select Ubuntu in Step 1 in the installer. Then in Step 2 browse and locate the Ubuntu .iso image file you downloaded. Then in Step 3 select the drive you have inserted, as well as click the box to format the drive and erase contents. Do NOT set a persistence as this will reduce the security. Then click create and wait for it to finish.
Once booted into Ubuntu, make sure to click "try ubuntu". You are only trying it out on the USB, and not installing it onto your main hard drive. The reason for using the bootable drive is everything exists in memory and mostly disappears when you shut down Ubuntu.
(It would be more ideal to install electrum in a complete cold environment, but I have heard that could cause some problems with Electrum at this time and it is best to install it while connected to the internet. But if you want true cold storage you must have zero internet connection at the time of creating the wallet. Since we are disconnecting before Electrum creates the seed, we should be good.)
At this point you are done, just shut down Ubuntu to make sure the evidence of the seed is erased. Then you can send Bitcoins to your cold storage wallet. You have effectively created a very secure cold storage wallet, in my opinion. To restore the cold wallet, just launch electrum and choose "restore wallet" option, type in your seed, and voila you have a hot wallet ready to spend again.
Extra: Using Truecrypt Encryption
Bonus tutorial is if you would prefer to save your seed on another USB or digital device. It is not recommended to do this, unless the seed in encrypted. Even then I would only leave it on a USB and not plug it into any hot device just to be safe. I would recommend Truecrypt although its possible the NSA has hacked Truecrypt, so use at your own risk.
sudo add-apt-repository ppa:stefansundin/truecrypt
sudo apt-get update
sudo apt-get install truecrypt
Hit enter after each command. If it asks permission, press y. Sometimes I had problems getting commands to work in the past. For some reason first installing flash from the software center fixes the problem, but I have no idea why.
Choose a size for the file, probably 5 MB is enough, but by all means choose more if you want to hold more files. Click next and make sure to choose a SECURE password for the file. If you don't pick a good enough password it will be brute forced easily. Use numbers, letters, capitals, lowercase, symbols, and make it long as possible. Try to have it something you can memorize if possible. Then click next. Then format it as FAT, and click next. Move your mouse around for entropy and then click Format, and your truecrypt container has been created.
I think this is a decent easy to follow tutorial. Hopefully this can help some newbies out, if I made any mistakes please feel free to correct me.
Edit: Sorry formatting sucks.
submitted by btcfreedom to Bitcoin [link] [comments]

Bitcoin Cold Storage Part 2: Building a Cold Storage Netbook with Electrum Setting up cold storage in Armory on Ubuntu 14.04 BitFreeze - Bitcoin Cold Storage Wallet Generator - built w/ Electron How to install Bitcoin Armory in Ubuntu 14.04 Bitcoin using Linux boot USB and secondary for a cold storage wallet

To do this in Ubuntu: Move the cold wallet into the Bitcoin Core data directory; Run bitcoin-qt, passing the wallet filename to the “wallet” option; For example: cd /path/to/bitcoin-core ./bitcoin-qt -wallet = cold.dat. This will load your cold wallet into your Bitcoin Core client. Once you’ve entered the passphrase, it’s good practice to consider the wallet “warmed-up” - so you ... Dies ist eine komplette Anleitung für Bitcoin Wallets. In diesem ausführlichen Beitrag erfahren Sie mehr über die besten Bitcoin- und Krypto-Wallets für Handy, Desktop und Cold Storage. Now we want to grab our cold storage wallet.dat file and move it into this directory, and start bitcoin-qt with the -rescan flag. The rescan will force the wallet to look for transactions related ... This guide show how to store coins in a cold storage situation with the ability for heirs to recover your funds if you die. The guide is a bit hard to read with many optional steps, and the "basic scenario" uses 2 hardware wallets with the same seed for some reason. It recommends putting information in a safe deposit box that is enough to steal funds, so you're putting a lot of trust in the ... Bitcoin is cool, and you know everyone wants in – even the ones who say they don’t. Show the world how cutting-edge you are with a bitcoin T-shirt, hoodie, bag, key-ring, even a Trezor ...

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Bitcoin Cold Storage Part 2: Building a Cold Storage Netbook with Electrum

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