Bitcoin Security 101: How to Create a 2 of 2 Multi ...

Electrum - Simply the best thin Bitcoin client

The best, cutting edge thin Bitcoin wallet.
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MVP Lineup

NFL, NBA Daily Fantasy Sports with Bitcoin. ✮PROVABLY FAIR✮ No cheating like the fiat industry leaders. Publicly available lineup hash ensures that teams were not altered after the start of a contest. ✮ANONYMOUS✮ Minimal information is required to play. ✮SAFE✮ Cold Storage, Multi-Signature wallets protect the bulk of user funds. No 3rd party handling of funds (we run a full Core Node!). ✮LIVE SCORING✮ Watch your fantasy players add points to your team as they score in the Real Game.
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BitBulls

For Reddittors that are Bullish on Bitcoin and Bullion.
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Unchained Capital is in Chicago tomorrow evening for a free event to talk BTC security and to demo their Bitcoin multisignature vaults.

Unchained Capital is in Chicago tomorrow evening for a free event to talk BTC security and to demo their Bitcoin multisignature vaults. submitted by Chl0r0PHIL to Bitcoin [link] [comments]

My talk about Bitcoin multisignature applications at a Berlin meetup

My talk about Bitcoin multisignature applications at a Berlin meetup submitted by use_your_imagination to Bitcoin [link] [comments]

Introducing Business Accounts for Bitcoin - Now companies can easily hold their own private keys in collaborative multisignature

submitted by unchainedcap to Bitcoin [link] [comments]

Paid Freelance Job: Migrate the same Electrum Setup to Armory

I have setup a Bitcoin Multisignature Setup with three different hardware wallet over Electrum. I want to setup the same multisignature setup on Armory.
I look for a freelancer who can help me with that, I will pay you for your time.
If interested please send me a DM.
submitted by smabtc to Electrum [link] [comments]

How-to: setup your multisignature Cold wallet in Bitcoin Core 0.20 (highest security setup)

Last release of Core is amazing !
The main new feature is sortedmulti descriptor. This allows you to import your multisig setup in Core almost as if it was Electrum when combine to the new PSBT export in GUI !
As it needs command line and some weird checksum, you also need to input very long command in the console and if you made a mistake, you cannot copy the last command you made. So take your time when the commands are long to check everything and don't miss anything, use copy paste before validating the long command. You only have to do this once fortunately :)
I detail here how you do it with a k of n setup, good luck:
And you are DONE ! You should get the exact same addresses than Electrum and you can created receiving addresses in Qt ! To send money, just go to the send section, use the new coin control feature and export a partially signed transaction. You can use HWI or Electrum to sign it with your hardware wallets !
Notice: You can import more or less than 2000 addresses of each type. If less, blockchain rescan is faster but you may need to redo what we have done here later when all addresses will have been used once. If more, it is the contrary.

You now have the most possibly secure setup in one software: multisig with hardware on the full node wallet. When Bitcoin Core 0.21.0 will be out, we will also have native descriptor wallet so maybe we will have HD version of this. But for now, this is the best you can do ! Enjoy :)

P.S. : if you like doing things in one shot you can do the last two steps in one big command: importmulti '[{"desc": "wsh(sortedmulti(k,[path1]xpub1.../0/*,[path2]xpub2.../0/*,...,[pathn]xpubn/0/*))#check_sum0", "timestamp": birth_timestamp, "range": [0,2000], "watchonly": true, "keypool": true}, {"desc": "wsh(sortedmulti(k,[path1]xpub1.../1/*,[path2]xpub2.../1/*,...,[pathn]xpubn/1/*))#check_sum1", "timestamp": birth_timestamp, "range": [0,2000], "watchonly": true, "internal": true}]'
submitted by Pantamis to Bitcoin [link] [comments]

Trezor and Unchained Capital Team Up To Make Multisignature Safer (x-post from /r/Bitcoin)

Trezor and Unchained Capital Team Up To Make Multisignature Safer (x-post from /Bitcoin) submitted by ASICmachine to CryptoCurrencyClassic [link] [comments]

How-to: setup your multisignature Cold wallet in Bitcoin Core 0.20 (highest security setup)

submitted by Pantamis to BitcoinTechnology [link] [comments]

Guarda Academy | What is Multisig / Multisignature Wallet? A complete guide on Multi-sig Bitcoin Wallet ||

Guarda Academy | What is Multisig / Multisignature Wallet? A complete guide on Multi-sig Bitcoin Wallet || submitted by Mr_SauravKT to BitcoinTutorial [link] [comments]

How to bet safely on Reddit with Bitcoins

We all love Reddit, almost as much as we love sports betting.
So what could be better than betting with fellow Redditors without running the risk of getting scammed?
How can you achieve this wonderful situation? With Bitcoin and multi-signature transactions.
In short, what Bitcoin+Multisignature transactions lets you do is add an arbiter to the betting process, without giving that person control of the funds in the bet.
In fact, the arbiter doesn't even need to be involved in setting up the bet. The entire process can take place without them; the arbiter only needs to get involved if there's a dispute about who won.
Here's how it works. Each bettor has a bitcoin address with some funds tied to it. They also have a set of public and private keys used to "sign" transactions.
You can think of a multisignature transaction like checks for an account that requires more than one signature to be depositable. In our example, the transaction has 3 possible signers, both bettors and the arbiter. It is valid when two of the three sign it.
The two bettors combine their public keys with the arbiter's to create the multisignature "account" address. (The arbiter's key will be publicly posted) Each bettor sends the amount of the bet to that address. They PM the terms of the bet to each other and to the arbiter.
After the bet, the winner creates a transaction (a "check") that sends the winnings to them. They sign the transaction. They send the transaction to the loser for the loser to sign it and broadcast it ("deposit" it into the winners bank).
In the event that the loser decides to be a dick, the winner sends the transaction to the arbiter. The arbiter looks at the terms of the bet he received in the PMs, checks that the winner actually won, and signs the transaction and broadcasts it.
The key takeaway here is this: the arbiter never has sole control of the funds. If both bettors are honest, the arbiter never has to get involved.
It's really that simple. I have a walkthrough of the step by step in this thread That said, I recommend the process only for techies, or for individuals experienced in bitcoin.
If you have any questions, post them below or PM me.
Check the walkthrough post comments for arbiters (the mod of /dogebetting is setting his up right now {He's got a great track record of doing escrow}, so he should be online to do bets very, very soon)
submitted by harddata to sportsbook [link] [comments]

Distributed Sub-Networks: Unbounded Distributed Scaling of the Bitcoin Network Without Any Forks

TL;DR
I believe I have discovered a method to scale the Bitcoin network without the need to update the Bitcoin core code. Neither a hard fork nor a soft fork should be necessary. This can be achieved by securely distributing the ownership of a single multisignature Bitcoin wallet. The distributed ownership would be managed by a sub-network using a new blockchain which could provide any functionality its users desire, thus allowing for unlimited scaling and feature adoption. The proof mechanism to enforce the sub-network would not be limited to ASIC-compatible proof of work. Furthermore, any sub-network would be able to make use of innovative current and future blockchain technologies without the need to create a separate token (a.k.a. altcoin). For example, if a network would like to offer smart-contract functionality and code execution (e.g. Ethereum), anonymity (e.g. Monero), or any other utility, then it can enforce all of these protocols with authentic Bitcoin, so as to not dilute the crypto space with the creation of new, “alternative” coins and the value addition of these features can be fully recognized by Bitcoin. This can be achieved by distributing the ownership of a single Bitcoin multisignature wallet existing on the Bitcoin core network. The wallet can be used as a system of account in a scalable sub-network in a manner that guarantees the accounts held in the sub-network are tied directly to coins in the official Bitcoin Core network.
 
Introduction:
There is a clear division in the Bitcoin community regarding the implementation of a network hard fork. It appears the two most prevalent sides of the argument are:
 
If it wishes to grow into something much bigger than it is today, then perhaps the Bitcoin community should come to a consensus in order to move forward and robustly defend against the significant external threats looming over it. These threats include:
 
Definitions:
 
Properties of the sub-chain:
All wallets on the sub-chain include two IDs and one private key. The IDs are: an address for the sub-chain and a corresponding address on the super-chain. Of course the private key will be used to sign transactions on the sub-chain.
 
All nodes on the sub-chain will simultaneously observe the super-chain and the sub-chain.
 
A multisignature wallet will be created on the super-chain with each portion of ownership controlled by a mining node on the sub-chain.
 
The sub-chain will include two different types of blocks. We will refer to the sets containing the different types of blocks as:
 
Blocks_A and Blocks_B will be mined independently from each other on the sub-chain.
 
Blocks_A blocks will contain a header to notify the network they belong to the Blocks_A set, and likewise for Blocks_B blocks.
 
Blocks_A blocks and Blocks_B blocks can be of arbitrary and differing sizes and can be appended to the sub-chain in an arbitrary order.
 
Mining On The Sub-Chain
Proof of Work (or any other proof mechanism) will be applied to Blocks_A blocks independently from Blocks_B blocks.
 
Nodes will earn transaction fees on the sub-chain when they solve a block belonging to Blocks_A.
 
Nodes will earn transaction fees on the sub-chain when they solve a block belonging to Blocks_B.
 
The sub-chain will contain X mining nodes and only N of those nodes, where N < X, (and in this case N = 9) will be able to control one of the private keys of the multi-sig wallet on the super-chain over the period between any two given Blocks_A blocks being solved on the sub-chain.
 
These 9 nodes will be chosen through some sort of consensus mechanism by the X nodes on the sub-chain. This can be determined by hashrate magnitude, largest stake, democratic election by node votes, etc.
 
The nodes that are allowed to be one of the 9 nodes managing the keys of the multisig wallet on the super-chain will be re-evaluated every time a Blocks_A block is solved on the sub-chain and subsequently applied to the super-chain. This will be accomplished by taking all transactions from the Blocks_A block, executing them on the super-chain along with a final transaction containing the entire surplus of the multisig wallet into a new multisig wallet created and controlled by the 9 new nodes chosen by the sub-chain.
 
The obvious risk here is that 5 of the 9 nodes can collude and run away (back to the super-chain) with the full amount of funds accounted for in the sub-chain. This threat should be possible to mitigate in various ways that create a risk for any of the 9 nodes to behave improperly.
 
Security can start by the rest of the network making a best effort to pick reputable nodes during every re-election of the 9. Nodes with an established reputation and the ability to earn transaction fees simply for relaying transactions, should be earning a reward that outweighs the risk of attempting to steal. Lastly, a smart-contract could be executed on the sub-chain that requires the 9 key-holders to stake a relatively significant amount before they are granted 1/9 access to a multisig wallet controlling all of the sub-chain’s funds. If any four or fewer of the 9 key-holders act maliciously while five or more do not, then the honest nodes will gain the stakes of all the malicious actors. This could foster an environment of distrust among the 9 key-holders leading them to worry if thief partners may actually be trying to betray them for financial gain.
 
Note: I believe SegWit will support up to 20-of-20 multisig wallets. It would provide far more security if we use 11-of-20 compared to if we use 5-of-9. In fact, the security of this pattern should scale exponentially as M and N increase.
 
Also worth considering is the use of a larger value of M relative to N such as 6-of-9, 7-of-9,... but if M gets too close to N, it decreases the number of nodes that need to collude to put the multisig wallet funds in a permanent deadlock. Of course there would be no financial benefit to this on the sub-chain or on the super-chain, but external enemies of Bitcoin might be willing to attempt this.
 
Moving Bitcoin Into The Sub-Chain
A user who wishes to move BTC into the sub-chain from the super-chain will first create a wallet on the sub-chain, then notify the sub-chain of an upcoming transaction that he will give to the multisig wallet on the super-chain, then AFTER confirmation on the sub-chain, the user will send funds on the super-chain to the multisig wallet. (The order here is important, so that an eavesdropper does not create the corresponding sub-chain wallet for the true user after the true user has already spent the coins on the super-chain.)
 
Final Points To Note
An issue some members of the Bitcoin community have with increasing block size is that it eventually leads to the exclusion of smaller miners who cannot store the entire blockchain history on their nodes. Sub-networks could possibly be configured to clear themselves out by moving all funds back into the super-chain and then restarting tabula rasa (i.e. with an empty blockchain).
 
A solution to bandwidth constraints of small miners could be introduced without the need for a hard fork on the super-chain if future blockchain developments solve the bandwidth issue.
 
Any number of these sub-chains can be created if various factions of the Bitcoin community want their own custom functionality.
 
This pattern requires super-chain users to trust the sub-chain network before entering it, but requires no trust or cooperation between the sub-chain and super-chain networks. The one attack super-chain miners can inflict on sub-chain transactions coming back to the super-chain is to exclude all transactions involving the multisig wallet. This can be rendered simply as an inconvenience, however, if miners on the sub-chain dual mine on the super-chain and eventually validate a block themselves.
submitted by Michael_John_C to Bitcoin [link] [comments]

Phil Geiger from Unchained Capital joins Guy Swann on the Bitcoin Audible podcast to show how to build a multisig vault and to talk through why multisignature is the best-practice for long-term bitcoin security

Phil Geiger from Unchained Capital joins Guy Swann on the Bitcoin Audible podcast to show how to build a multisig vault and to talk through why multisignature is the best-practice for long-term bitcoin security submitted by sexyama to bitcoinpodcast [link] [comments]

Phil Geiger from Unchained Capital joins Guy Swann on the Bitcoin Audible podcast to show how to build a multisig vault and to talk through why multisignature is the best-practice for long-term bitcoin security

Phil Geiger from Unchained Capital joins Guy Swann on the Bitcoin Audible podcast to show how to build a multisig vault and to talk through why multisignature is the best-practice for long-term bitcoin security submitted by unchainedcap to Bitcoin [link] [comments]

Guarda Wallet Launches Multisignature for bitcoin

If you read this article: https://news.bitcoin.com/guarda-wallet-launches-multisignature-functionality-for-bitcoin/
Guarda wallet now integrate a multi sig wallet that is more convenient and lighter for any users. Also this protocol has been adopted by WhalesHeaven for their auction trading platform; a new player for market p2p that have a unique way of buying and selling of cryptocurrencies.
submitted by etherium_24 to ethinvestor [link] [comments]

Jessica Angel on The Bitcoin Podcast about Crypto Art - Also Multisignatures in Bitcoin by Dr. Corey Petty

Jessica Angel on The Bitcoin Podcast about Crypto Art - Also Multisignatures in Bitcoin by Dr. Corey Petty submitted by ma6ic to CryptoCurrency [link] [comments]

Jessica Angel on The Bitcoin Podcast about Crypto Art - Also Multisignatures in Bitcoin by Dr. Corey Petty

Jessica Angel on The Bitcoin Podcast about Crypto Art - Also Multisignatures in Bitcoin by Dr. Corey Petty submitted by sexyama to Cryptopodcast [link] [comments]

Multisignature cold storage secures bitcoin against many of the threats of self custody, but most open source options are too technical and difficult to use privately. This changes today.

Multisignature cold storage secures bitcoin against many of the threats of self custody, but most open source options are too technical and difficult to use privately. This changes today. submitted by unchainedcap to Bitcoin [link] [comments]

Guarda Wallet Launches Multisignature Functionality for Bitcoin | Press release Bitcoin News

submitted by Guarda-Wallet to GuardaWallet [link] [comments]

Guarda Wallet Launches Multisignature Functionality for Bitcoin

submitted by Ranzware to BitNewsLive [link] [comments]

Guarda Wallet Launches Multisignature Functionality for Bitcoin | Press release Bitcoin News

Guarda Wallet Launches Multisignature Functionality for Bitcoin | Press release Bitcoin News submitted by Guarda-Wallet to Bitcoin [link] [comments]

Guarda Wallet Launches Multisignature Functionality for Bitcoin

Guarda Wallet Launches Multisignature Functionality for Bitcoin submitted by n4bb to CoinPath [link] [comments]

Blockstream Releases the Schnorr-Based Multisignature Standard Test Code for Proposed Bitcoin Tech Upgrade

Blockstream Releases the Schnorr-Based Multisignature Standard Test Code for Proposed Bitcoin Tech Upgrade submitted by PentaBeer to Bitcoin [link] [comments]

Bitcoin financial service partners should be transparent and honest about privacy, security, and anonymity tradeoffs. Check out Unchained Capital's nuanced views in regards to our multisignature vault product

Bitcoin financial service partners should be transparent and honest about privacy, security, and anonymity tradeoffs. Check out Unchained Capital's nuanced views in regards to our multisignature vault product submitted by unchainedcap to Bitcoin [link] [comments]

What's a Multisignature Bitcoin Wallet and Why Should You Care? Bitcoin Q&A: Multi-signature and distributed storage How To Use Bitcoin Multi-Signature with CoPay How To Create a Secure Multisignature Wallet and Send Multisignature Transactions Bitcoin 101 - Multi-Signature Addresses pt1 - Coding This ...

The term multisig stands for multi-signature and the following post will teach anyone how to create a 2 of 2 multisig wallet. Multisignature (multisig) refers to requiring multiple keys to authorize a Bitcoin transaction, rather than a single signature from one key. It has a number of applications. Dividing up responsibility for possession of bitcoins among multiple people. Avoiding a single-point of failure, making it substantially more difficult for the wallet to be compromised. M-of-N backup where loss of a single ... Trotz der Tatsache, dass Multisig in der Welt der Kryptowährungen existiert hat, ist das Prinzip eines, das lange vor der Gründung von Bitcoin existierte. Die Technologie wurde erstmals 2012 in Bitcoin–Adressen implementiert, aber die erste Multisig-Wallet wurde erst ein Jahr später erstellt. Guarda has recently become the first multi-currency crypto wallet to offer support for Multisignature. Multisignature (also known as Multisig) wallets make it possible for two or more users to ... SpaceChain, the decentralized space agency, has announced the successful completion of a multi-signature Bitcoin (BTC) transaction on the ultimate frontier, as per a press release that's been published today, August 18th. The researchers sent about 0.001 BTC, worth around $122 at the time of press, to two different Bitcoin addresses. To achieve this, the company used specialized blockchain ...

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What's a Multisignature Bitcoin Wallet and Why Should You Care?

Green Address Bitcoin Wallet - Segwit, RBF, 2FA, Multisig and More - Duration: 23 ... How to do a Multisignature Bitcoin Transaction - Duration: 7:49. Alex Millar 11,095 views. 7:49 . Save Money ... Whether you want to add security or accountability to your bitcoin transactions or share a bitcoin wallet across multiple device, the BitPay multisignature wallet is a great option. Watch to learn ... How-To: - create a Multi-Signature (2/3) Bitcoin wallet in a Live-Linux environment - receive funds - send funds (with 2 cosigners) - distribute the seeds/pr... He is the author of two books: “Mastering Bitcoin,” published by O’Reilly Media and considered the best technical guide to bitcoin; “The Internet of Money,” a book about why bitcoin matters. How to do a Multisignature Bitcoin Transaction - Duration: 7:49. Alex Millar 11,366 views. 7:49. Bitcoin Q&A: Multi-signature and distributed storage - Duration: 17:58. ...

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