Completely Offline Bitcoin Transactions by grubles ...

SUQA is an opensource peer to peer digital currency

SUQA is a new opensource peer to peer digital currency that gives the investors 5% apr interest from term deposits even if the wallet is offline. It is based on an improved code of the secure and widely used Bitcoin Blockchain with a brand new advanced memory intensive X22i POW algo which is completely ASIC, FPGA and Quantum Resistant.
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Create wallet offline like Bitcoin? Signing transactions offline?

Can I create a wallet offline with the Peercoin client? Would I then just backup the wallet.dat to a secure location?
Also, is there a Peercoin wallet similar to Electrum which has the feature to sign transactions offline? I'm looking for ways to send PTC without having to import the private key, or transferring the wallet.dat, onto a computer with an internet connection.
Security tips would be great!
submitted by 9MrIce9 to peercoin [link] [comments]

Are there online tools so that a person, by an online tool #1 ((which can be downloaded and then run offline) ), might create a transaction offline with their private key and then, by an online tool#2, might broadcast this signed transaction into the Bitcoin blockchain?

submitted by andrrpetr to Bitcoin [link] [comments]

A guide to sign a super bitcoin (SBTC) transaction offline with patched Electrum for paranoid. Supports any wallets supported by Electrum (including segwit-p2sh and bech32 and all BIP39 seeds). Later BCD will be added.

This is quite advanced. This guide assumes you have some basic experience with the command line, can run Linux and you understand the basics of keys/signing/broadcasting transactions. And that you can compile and run Bitcoin Core and run Electrum. Also, some JSON experience is also nice.
Move you bitcoins to safe addresses first. It is best to use a new seed. Although the procedure in this guide is safe even for hot addresses (containing bitcoins), there is always a risk of a critical mistake. So play it safe.
Why such a guide? I followed these steps because I did not want to expose the keys to any online machine at all. Even if the keys do not have any bitcoins, you can some day have bitcoins sent to these addresses or you have a fork that you have not claimed. All can be stolen if you exposed your key.
This procedure should work with everything that Electrum supports (except maybe F2A that may be not supported on the SBTC chain), so Electrum seed legacy or segwit, LedgeTrezor with legacy or segiwt-p2sh (m/'49) derivation. Similarly, any BIP39 seeds or a single key. are also fine.
  1. Download Electrum. git clone https://github.com/spesmilo/electrum
  2. Apply my patch patch -P0 also this article. The guide assumes that you use patched Electrum from now on.
  3. Run the patched Electrum and catch up with your wallets you want to claim (the wallets can and rather should be watch only, or on ledgetrezor, otherwise your keys are exposed). Now go offline or set localhost as your server that Electrum connects to so no connection is performed. It's required so Electrum will not update the wallet after you edit it.
  4. You can manually create a transaction from the command line but you can use Electrum GUI. You need to locate the wallet file and remove all the transactions from the wallet file except for the one that funds the address you want to claim (the wallet obviously must not be encrypted but for watch-only this is OK). This is tricky. You need to make sure, you gave a proper JSON file, so all the final commas must be dropped. So "addr_history":, "transactions": , "tx_fees":, "txi", "txo", and "verified_tx3": should only contain the funding transaction(s), i.e. the one that you want to spend from.
  5. Run Electrum and check if the wallet is OK. Electrum will show an error if not. You will probably make a few errors so go back to editing the wallet.
  6. Download SBTC bitcoin core clone. git clone https://github.com/superbitcoin/SuperBitcoin
  7. Compile it and let it sync the blockchain (it will take a long time). Run it it with as large -dbcache= as you can. If you have a Bitcoin blockchain you can copy the blocks up to the fork date and issue sbtcd with -reindex. It will just reindex them and it will be faster.
  8. Generate a sbtc address with sbtc-cli getnewaddress. You can skip this step and send directly to an exchange but this intermediate step is safer.
  9. Create a transaction in Electrum to this address. Select all the bitcoins and use as small fee as possible (SBTC blocks are empty so any fee above 1 SBTCsat/byte should be OK).
  10. Save the transaction to a pendrive
  11. Download and install Kubuntu 16.04 (Kubuntu has all the QT libraries for Electrum) on a pen drive.
  12. Copy patched Electrum and the save the transaction to a pen drive (separate from Kubuntu will be more convenient).
  13. Run Kubuntu from the USB without any network access. Run Electrum from the pendrive. Create a wallet from the seed or private keys. The wallets are stored in RAM so after you reboot the computer, they will be gone. Load the transaction, sign it and save it to the pen drive.
  14. Go back to the SBTC Core on the online machine. Display the raw transaction (starts with the hex=). Check in the SBTC Core if it is correct sbtc-cli decoderawtransaction hex
  15. If it looks fine (and your blockchain got synced), broadcast it sbtc-cli sendrawtransaction hex
If there is no error, congratulations, you sent the transaction to the specified address. If it is to your SBTC Core wallet, wait until it confirms and send it further with sbtc-cli setfee feeperkb sbtc-cli sendtoaddress "addr" value "" "" true true
I'm going to update this guide when I figure out the BCD transactions intrinsics. You can download and run the BitcoinDiamond Core clone in the meantime.
SBTC tips: 1KjuY8CTrwMhdLt3uF3hCcSgfkHMyo1ELf
submitted by PVmining to BitcoinAirdrops [link] [comments]

[HIRING] Tool to sign offline a specific bitcoin raw transaction.

I am looking for a coder who can code a simple tool (an Android app) - to:
. Sign offline a specific bitcoin raw transaction - imported via QR code;
. Generate the QR code of the resulting signed raw transaction.
SCAMMERS: Stay away, I pay NO upfront fee whatsoever.
submitted by franckn5 to Jobs4Bitcoins [link] [comments]

Is there a tutorial for dummies how to do this? FWIW: you could have spent a few bucks on the cheapest possible notebook and create an airgapped offline electrum there, import your mnemonic, create a watch only wallet for your online device and safely sign the transactions from your offli /r/Bitcoin

Is there a tutorial for dummies how to do this? FWIW: you could have spent a few bucks on the cheapest possible notebook and create an airgapped offline electrum there, import your mnemonic, create a watch only wallet for your online device and safely sign the transactions from your offli /Bitcoin submitted by ABitcoinAllBot to BitcoinAll [link] [comments]

Recently learned about Bitcoins raw transactions and signing offline features through RPC commands, are all cryptocurrencies able to do this through their core client?

I know some coins have GUI ways of signing offline transactions like LTC and BTC having Electrum with user friendly features. As well as Ether and some others having HTML/web wallets that can be run offline.
But those tools are not available to all coins as far as I know. Having just learned that it can be done through the core client which I thought is something all coins have, I wanted to make sure if this option of keeping private keys in cold storage but still being able to send coins without making new addresses by signing offline would be available to all coins if done through RPC commands.
submitted by Epistechne to CryptoCurrency [link] [comments]

Can someone please give me step-by-step instructions on how to: 1) setup Bitcoin Core on an offline computer, 2) create transaction on an online computer, 3) sign the transaction on the offline computer, and 4) broadcast the signed transaction on the online computer? USING ONLY BITCOIN CORE.

This is the only missing piece for me with Bitcoin Core. This, combined with hierarchical deterministic wallets (which are coming soon!), I can cut Armory out of the equation entirely.
submitted by btcfan8877lol to Bitcoin [link] [comments]

Recently learned about Bitcoins raw transactions and signing offline features through RPC commands, are all cryptocurrencies able to do this through their core client? /r/Bitcoin

Recently learned about Bitcoins raw transactions and signing offline features through RPC commands, are all cryptocurrencies able to do this through their core client? /Bitcoin submitted by ABitcoinAllBot to BitcoinAll [link] [comments]

09-30 18:33 - 'Recently learned about Bitcoins raw transactions and signing offline features through RPC commands, are all cryptocurrencies able to do this through their core client?' (self.Bitcoin) by /u/Epistechne removed from /r/Bitcoin within 22-32min

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Recently learned about Bitcoins raw transactions and signing offline features through RPC commands, are all cryptocurrencies able to do this through their core client?
Go1dfish undelete link
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Author: Epistechne
submitted by removalbot to removalbot [link] [comments]

Recently learned about Bitcoins raw transactions and signing offline features through RPC commands, are all cryptocurrencies able to do this through their core client? /r/Bitcoin

Recently learned about Bitcoins raw transactions and signing offline features through RPC commands, are all cryptocurrencies able to do this through their core client? /Bitcoin submitted by cryptoallbot to cryptoall [link] [comments]

[HIRING] Tool to sign offline a specific bitcoin raw transaction.

Since my coding abilities are very limited, I am looking for a professional coder who can teach me how to code a simple tool (an Android app) - to:
. Sign offline a specific bitcoin raw transaction;
. Generate the QR code of the resulting signed raw transaction.
I can pay this professional coder on a per hour basis, and we can remotely work together via Skype and/or Teamviewer, and/or through other means seeking utmost efficiency.
submitted by franckn5 to Jobs4Bitcoins [link] [comments]

Python script to read raw transaction and print fee rate for offline signing with Bitcoin Core

Looking to up my security game, but I remain anxious about signing transactions offline. The problem is that it is hard to check a transaction to see what the transaction fee is so that you can be sure you are not sending more than you intend to miners.
I'm looking for a simple python script that will read an unsigned raw transaction, and query an instance of bitcoin to figure out how much fee is being paid.
Might write this myself by converting Rusty's code but I wanted to see if it's already out there.
Edit: Hang on there.. looks like you can print the feerate by calling fundrawtransaction?
submitted by moral_agent to Bitcoin [link] [comments]

Python script to read raw transaction and print fee rate for offline signing with Bitcoin Core /r/Bitcoin

Python script to read raw transaction and print fee rate for offline signing with Bitcoin Core /Bitcoin submitted by HiIAMCaptainObvious to BitcoinAll [link] [comments]

Tails OS now includes the Electrum bitcoin wallet 2.7.9, and can perform offline signing of transactions for increased security

submitted by Anenome5 to BitcoinWallet [link] [comments]

Redeem Bitcoin Cash HODL & P2SH Addresses - Now with Offline Signing. I upgraded the code on my site, you can now sign Bitcoin Cash transactions offline :)

submitted by BitcoinAllBot to BitcoinAll [link] [comments]

[uncensored-r/btc] How to sign Bitcoin Gold transaction offline?

The following post by Shichroron is being replicated because the post has been openly removed.
The original post can be found(in censored form) at this link:
np.reddit.com/ btc/comments/7ib8bh
The original post's content was as follows:
Someone happens to have a nice script I can use?
Also, how can I manually upload my transaction to BTG mempool?
Thanks
submitted by censorship_notifier to noncensored_bitcoin [link] [comments]

How to sign Bitcoin Gold transaction offline? /r/btc

How to sign Bitcoin Gold transaction offline? /btc submitted by BitcoinAllBot to BitcoinAll [link] [comments]

Platform-independent & easily auditable tools to sign offline Bitcoin's transactions.

I have created safely different private keys for long term cold storage addresses on an air gap machine using dices and different easily auditable platform-independent / multi-platforms software like bitaddress.org
After creation of these cold storage addresses, I made a test to redeem funds from them - before committing on storing larger amounts of bitcoins on them.
So I have been looking for secure and easily auditable platform-independent / multi-platforms ways to sign offline transactions from these cold storage addresses (the same way I was using secure and easily auditable platform-independent / multi-platforms to generate private keys).
So far I found only two tools to do so and I used both of them. These tools generated raw transactions that I carefully checked before broadcasting them using https://blockchain.info/pushtx
These 2 tools are:
https://www.strongcoin.com/downloads/offlineTransaction.zip
http://offlinewallet.appspot.com/
However, the offline signed transactions generated through these 2 tools would not confirm and I don't know why (of course, I don't care about the tiny amounts of money involved - as this was just for testing purposes before committing larger amounts of btc, as I said at the beginning).
Here are the 3 cold storage addresses involved in these different non-confirmed transactions.
1NFo5qAsCm5Uc633LdivSu7QUF2kh2PSrw
1BA4xtowWC3HqsYWwWZcKmKLmUgSaw9diG
1P4nHtswu8CiZDHiPZX486m35BedGpk1gX
Therefore I am still stuck on finding a secure and easily auditable platform-independent / multi-platforms to sign offline transactions). I dont want to use Electrum or Armory - which are not independent enough - in my opinion. Would you have any insights?
submitted by franckn5 to Bitcoin [link] [comments]

Electrum 2.7.9 can't sign offline transaction, so I need a Tails alternative /r/Bitcoin

Electrum 2.7.9 can't sign offline transaction, so I need a Tails alternative /Bitcoin submitted by BitcoinAllBot to BitcoinAll [link] [comments]

Now that HD (hierarchically deterministic) wallets have been added to Bitcoin Core, is it now easier to create a cold storage wallet, sign offline transactions, and broadcast signed transactions using only Bitcoin Core?

If so, can you provide instructions on how to do this?
(It's a PITA to maintain a separate Armory on top of Bitcoin Core.)
submitted by btcfan8877lol to Bitcoin [link] [comments]

Can I sign a transaction with my private key offline via electrum to an exchange address? /r/Bitcoin

Can I sign a transaction with my private key offline via electrum to an exchange address? /Bitcoin submitted by BitcoinAllBot to BitcoinAll [link] [comments]

Can I sign a transaction while offline and then broadcast it from another machine? /r/Bitcoin

Can I sign a transaction while offline and then broadcast it from another machine? /Bitcoin submitted by BitcoinAllBot to BitcoinAll [link] [comments]

Bitcoin Q&A: Offline transactions and fault tolerance Offline Transactions with Bitcoin - YouTube Electrum offline transactions tutorial - YouTube how to sign a bitcoin message - bitcoin signature - YouTube imToken offline transaction signing demo

Digital money that’s instant, private, and free from bank fees. Download our official wallet app and start using Bitcoin today. Read news, start mining, and buy BTC or BCH. What can you do to ensure more safety when using Bitcoin? Well, if you have two computers, you can always keep your private keys separated from the internet, protecting them completely against cyber attacks. All you have to do is, create your transaction online, sign it offline to protect your keys, and broadcast it online again. This is what is known as “air gap” protection. Brainwallet Generator. If you have trust issues with third-party services (BTC.com, Blockchain.com, BitGo.com, Coinbase.com, etc) securing your Bitcoin, Altcoin, or other Cryptocurrency, you will want a Brainwallet – the most affordable and secure solution today. Completely Offline Bitcoin Transactions. grubles. Follow. Feb 7, 2019 · 5 min read. With the advent of Blockstream Satellite and widely broadcasted, passively-receivable Bitcoin data, a new era ... Create bitcoin wallet online best free bitcoin wallet. Get Your Free Online Cryptocurrency Wallet. HolyTransaction is your multicurrency wallet with instant exchange that support Bitcoin, Litecoin, Dogecoin, Dash

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Bitcoin Q&A: Offline transactions and fault tolerance

Step by step guide on creating a raw transaction with bitcoin core client. createrawtransaction '[{"txid":"", "vout":}]' '{"1anyAddress":0.01,"1changeAddress... Bitcoin Revolution Sign In ️ http://top-deal.pro/BitcoinRevolution Bitcoin Revolution - Bitcoin Is Making People Rich The Bitcoin Revolution is a group rese... https://steemit.com/bitcoin/@bitsignal/how-to-sign-a-bitcoin-message-using-your-private-key I used the following github tool to sign the message: https://git... Sign in to make your opinion count. ... Bitcoin Cold Storage With Old Cell Phones - Duration: 14:12. Sean Logan 7,075 views. 14:12. How To Create Ethereum Wallet Address and Send / Receive ETH ... Sign in to add this video to a playlist. ... Offline Transactions - Duration: 4:57. super3boy 6,125 views. 4:57. How to unlock a car door (without a key) - Duration: 8:52. Make It Easy Mechanic ...

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