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Proxy Wallet Launches Today After much anticipation, Proxy Card is launching its secure hybrid wallet today. With a focus on the end user, this pioneering wallet aims to do for financial services what Apple did for smartphones. http://ift.tt/2E1Uqcn

Ins and NagaCoin Memeber Harold Kim Joins LOC Token team as Advisor Mr. Kim originates from Korea and is also a member of Ins and NagaCoin projects. He played a key role during the exchanges listing processes for both of these projects and will be utilizing his established know-how and business network to help with the process of listing LOC on higher liquidity markets. http://ift.tt/2BHcljv

ARK’s Evolution Continues as they Roll-out Preeminent Script Update All-In-One Blockchain solution, ARK, has announced the next stage of their business development with the release of ARK Deployer, a lightweight script which helps to solidify the completion of their ‘Point. Click. Blockchain’ system. http://ift.tt/2DOX5ml

GPU mining testnet I've been trying to find information on this online but it is quite difficult. I want to GPU mine testnet for a short period of time, for learning and also to acquire some test coins. Maybe even implement a faucet. What options are there? Is an old version of cgminer an option? http://ift.tt/2BI0VvR

Accidentrally spent from unconfirmed transaction I accidentally spent btc from an unconfirmed transaction. Is it likely to confirm at a later date or is it just kinda stuck? Ive tried searching for answers but I'm seeing conflicting information relating to this. http://ift.tt/2nq8OBL

NiceHash Will Initiate Reimbursements to Users Starting February 2nd NiceHash has announced its plans to start reimbursing all users that were affected by the security breach that happened on December 6th last year starting this Friday, February 2nd. The NiceHash Repayment Program will initially reimburse 10% of the old balance amount to all users that were impacted by the security breach. NiceHash will continue to periodically repay the remaining amount to all users in the coming months untill the full amount from the old balances is paid back. The old balance will be repaid in Bitcoins (BTC) and not in the fiat value or any other cryptocurrency… Repayment program for internal wallet users Users that were registered on the NiceHash platform before December 6, 2017 can log in to their account and can see their old balance tab under the Wallet section on their Dashboard. The old balance shows the total amount of Bitcoins (BTC) that users had on their wallet address prior to the atta

Unable to broadcast native P2WPKH (SegWit) TX; malformed, but how? I'm trying to add SegWit functionality to my app but am running into trouble building my transaction. I've read BIP143 so many times I virtually have it memorized, and I've followed it to the letter. But for whatever reason my TX is being rejected. Here's how my transaction is structured: input #1 AF83F3F0EA5D11C3824C336250325D7597F891384282F73362AF0D7A70A94713, index=1, amount = 1000000 This is a P2WPKH input corresponding to address bc1qe9p5qmlqwhaxtmjkrdfp8lyswyww8ur5pzkg3c input #2: E85B128C57AD00E7439D25E1ED1BA18E74886D45E45DEE7F4C196566946D0BC9, index=1, amount = 3571510 This is a standard P2PKH input output #1: bc1q5ss6h56zsv56q3w2axwwv2v9zqgajtr5ud5llr, amount = 1071200 output #2: bc1qj2r7lu7g3tccv4zsg54c08ptgescaxt8u8tfvs, amount = 3471510 I've built my transaction according to the specifications presented in BIP143 . Here's the transaction in hex form: 010000000001021347A9707A

Setting a minimum difficulty on BTC.com As the title already says, does someone know how to set a minimum difficulty on BTC.com? Is it possible at all? I was setting a difficulty by supplying d=<difficulty> as a password. Initially that works, but it keeps lowering the difficulty to way too low values. http://ift.tt/2E4xBFe

Any studies on minimum USD value needed on BTC to make mining worth the cost? My understanding of the Bitcoin ecosystem is that the task referred to as "mining" is actually the processing (confirming) of the Bitcoin transactions, and that the miner "finds" a coin when they find the accepted hash of a block of transactions. Based on the information in other questions here, the mathematical difficulty of processing the transactions is expected to increase as more Bitcoins enter the ecosystem while at the same time the block reward is expected to halve at every 210,000 blocks. The mathematical difficulty present in the mining process has of course a bearing on the cost of electricity and processing time of the hardware. On top of that the miners do have costs for paying for the warehouse or other location where the server farms are kept, besides indirect costs in things like depreciation of the hardware. Currently we also have the situation that the USD value of BTC

How do I spend bitcoins from multiple wallets in a single transaction? Using, e.g., the Bitcoin Core command line, how could I spend bitcoins from multiple wallets in a single transaction? This comment says: instead of sending the transaction to the network, you send it to the next person who will add their inputs and outputs and sign them as well, and so on. The last person would then broadcast the transaction on the network. I assume I use createrawtransaction and signrawtransaction somehow, but how exactly do I actually do this? cf. Mastering Bitcoin (1st ed.), §"Using Bitcoin Core’s JSON-RPC API from the Command Line" , §§"Creating, Signing, and Submitting Transactions Based on Unspent Outputs" http://ift.tt/2E2iDzn

How can i switch from BIP32 to BIP44 using bitcoinj i am working on a wallet that is using BIP32 for creating Accounts, addresses, xpub, public keys, transaction and etc. but now i want to switch from BIP32 to BIP 44. how can i do this using bitcoinj i also study this , but there is nothing related to implementation. All i need to know that how can i implement BIP44 using bitcoinj and what is specific changes i have to do.Do i have to change all the hierarchy, if yes, then how can do this http://ift.tt/2Fwqang

How are transactions verified by nodes other than the initial receiver? If I understand correctly, when I create a new transaction from my wallet, I have to sign it and encrypt it. My wallet encrypts the message using the public key of the node it is connected to, so it can decrypt the message when it receives it, and signs the message with my private key, so the node knows it was me who sent the message because my public key is then sent along with the message. What I don't understand is that when this message is transmitted to the other nodes for verification, how can they decrypt it if it was encrypted using the initial node public key. Furthermore, I read that also the miners should verify the validity of the transactions they have received. How can they decrypt the transactions? http://ift.tt/2Etr5FR

What ivestments you can do in Bitcoin? [on hold] I have made some profits in 2017 on buying and selling BTC and ETH, and I was looking to find some more complex opportunities about cryptocurrencies, in general. We all know that many industries started to accept digital currency as a method of payment for their services, but how about making money on it? Unfortunately, I'm not a computer genius, so mining BTC is not an option for me. I came across this website - http://www.beetoom.com - this company is said to be the first trading environment that exclusively uses Bitcoin! Basically, you deposit BTC - trade on markets - and withdraw profits in BTC. This sound very good to me, since you can benefit twice: from BTC price movement and from capital markets in the same time! I have opened a demo account to check the platform, as I have a little experience with MT4 and MT5. In my opinion, they have a way better and intuitive platform that also allows you to check the other traders'

A Subpoena to Bitfinex and Tether Made Bitcoin Price Fall Under $10,000 Threshold The U.S. Commodity Futures Trading Commission has sent subpoenas to the world’s largest cryptocurrency exchanges Bitfinex and Tether as there are significant questions surrounding the value of their tokens. http://ift.tt/2nu7Rrw

Coinfirm Gets Over 16k ETH in Token Sale and Adds Internationally Recognized Joey Garcia to Advisory Board January 31, 2018 - Leading token sale advisory firm TokenMarket has supported Coinfirm, a global RegTech enterprise focused on anti-money laundering for Blockchain, to sell $19 million worth of AMLT Tokens. http://ift.tt/2FwZ3Iy

Transactions for multiple crypto-currency coins in cold storage without downloading full block-chains I've searched on the internet and still unable to understand the usage of cold storage. Actually, I want to buy a few types of low price crypto currency coins and save them in my personal devices or papers. Later I need to send them to some exchanges to sell at higher price. I don't want to rely on online sites/firm meanwhile before exchange. Neither I want to download blockchains of each currency. So, how can I efficiently save my coins in my personal captivity? If I use offline wallet generator, how In-ward and Out-ward transactions will be carried out? http://ift.tt/2FwNhy4

howto put first amount of altcoin into network? [on hold] if you clone another cryptocurrency and generate a new genesis block, starting a new coin with balance of zero, how should you put the first amount of money into the network. For example, I want my currency starts with 1000 coins. http://ift.tt/2E1Q2u5

What's the advantage of making a new node sync from the genesis block? Bitcoin's blockchain is very much like a version control. It versions the unspent output database (and some metadata I don't know about) and blocks represent the deltas (commits or patches) to this database. Now if you want to know the state of the system after 1000 blocks, you need to start from the genesis block, then download, verify and apply 1000 blocks (patches) to it. Now we are beyond 500000 blocks and syncing up new node takes ages. Version controls solve this problem by inserting a full snapshot instead of deltas after several revisions so one don't have to apply all patches from first to last to get to the latest state. But this is not necessary. It's enough if patches contain a hash of the state they are patching allowing the verification of the deltas themshelves. So if you have revision 1234 of the state the patch that upgrades it to revision 1235 contains a hash of it, so the on

Does &quot;id&quot; matter in JSON RPC for Ethereum? At https://github.com/ethereum/wiki/wiki/JSON-RPC "id" is always different for each RPC call and it's a digit. Is this made of purpose, is each have a percise id assigned to it? Or can it be random, as per RPC specification? http://ift.tt/2DZQclE

Unable to Unable to decode input address It seems that some transactions, although having "prev_out" field in their "inputs", does not have "addr" in the "prev_out", i.e. they do not have input address. What is this kind of transactions for? e.g. transaction hash: 38d4154f800cbbce0ac39772dd88d338424be21ba36ccb6a11110a029e6b5a1e http://ift.tt/2FyJKzj

How to give IP to my node on the Bitcoin Lightning Network I want to give Ip address to my new node . I have got the pubkey for my node , on the lightning.exe application ,but could not set IP address to my node so that it can be seen publicly on the site " https://explorer.acinq.co/#/faq ". I have already created 4 channels also but need way to enter IP address. http://ift.tt/2E1oCEB

Zcash configure in ubuntu I have tried to installed zcash insight ui & api in my local machine (ubuntu OS) and it is completed all the steps but I m facing issue while start services in frontground. Let me share with you command, config file. npm install -g zcash-bitcore-node zcash-bitcore-node create mynode cd mynode zcash-bitcore-node install insight-api zcash-bitcore-node install insight-ui zcash-bitcore-node start But getting below error in my terminal: [2018-01-30T12:33:03.687Z] info: Using config: /home/kiran/zcashnodenew/zcash-bitcore-node.json [2018-01-30T12:33:03.688Z] info: Using network: testnet [2018-01-30T12:33:03.688Z] info: Starting bitcoind [2018-01-30T12:33:03.690Z] info: Using zcash config file: /home/kiran/zcashnodenew/data/zcash.conf [2018-01-30T12:33:03.691Z] info: Starting zcash process [2018-01-30T12:33:03.699Z] error: Error: spawn /usr/local/lib/node_modules/zcash-bitcore-node/bin/zcashd ENOENT at _errnoException (util.js:1003:13) at Process.ChildProce

Does the Longest Chain Always Win the Mining Award? If the longest chain (i.e, the one that's the most difficult to produce or the most transactions) is always awarded with 12.5 coins (or whatever the current prize is), what happens if a specific node is aware of a certain set of transactions but doesn't broadcast them to other nodes (the network) and includes them in it's own hash. Wouldn't this automatically guarantee it will win the mining award? http://ift.tt/2BH6gn0

Market Cap API? I am using CryptoCompare's API and it gives me volume data, but I am wondering where I can get market cap / circulating supply data. Do any reliable API's provide this? http://ift.tt/2noWQs7

How to set up a node on Testnet of Lightning network on the world map I am currently having problems posting my node on the "World Map." I can see my node on the "Force Map" on this site . Can anyone tell me how to enter the public IP so that it can be seen on the "World Map"? My node is currently showing the pubkey but not the public IP. Can anyone help me with steps of how to enter the IP of my node? http://ift.tt/2rV9xQc

Second wallet needed to mine BTC? I am being invited to invest small amount of BTC. I am being asked to create second wallet. Is this legitimate? I am trying to understand the mining process, I did not think one needed to use bitcoin to mine more bitcoin. I am trying to understand how this works, excuse my slow learning. Thank you, Andrea http://ift.tt/2GyEihd

How to transfer my wallet.dat to dedicated Ubuntu server Sorry for dummy question at first. I have developed an application on my local dev machine. Now I want to make a realease on production server located elsewhere to which I have ssh access. I dont want to put my wallet.dat in git. Of course. But dedicated server doesnt have access to my local virtual ubuntu developer machine where wallet.dat is kept. So I have to copy my wallet.dat from one virtual machine it terminal to another terminal. I thought I could dump keys to some text file and simply copypast it between servers. But dumpwallet command creates file with hundreeds of addresses and each one of them should be than imported on by one by importprivkey and there is no option to import dumped file (weird, no?) http://ift.tt/2rVt1Ec

How to set up fresh blockchain (altcoin) So i was following this guide: https://bitcointalk.org/index.php?topic=1080289.0 I compiled a qt wallet for BlackCoin successfully, but i ran it and its synchronizing with the network by itself? how do you set up a fresh node and start to mine your own coin? I tried to search it but didn't get any good answers seems like many people are having synchronization issue, but my wallet just synchronizes itself, is there some IP defined in the codes or something that its connecting to other nodes already? http://ift.tt/2GyEexZ

How does mining software work? How to make my own? Say I'm not interested in earning money and I'm just doing it out of extreme boredom. How do you receive and transmit the transactions and blockchain updates? Where on the Internet do they reside? http://ift.tt/2rO0q3E

How do I search for a hidden and disguised (extension changed) wallet file on damaged hard drive? Back in 2012 we had a bitcoin or two on a computer that crashed. It was a dual boot system and the wallet was in the Linux partitions. The user, a family member, changed the file extension to a extension document, probably open office or abiword. I am trying to reconstruct the hard drive, and have recovered the files from the Linux partitions. I need to know how to search for and find the file now. I have been researching my butt off trying to find a reliable way to find it. The only computer I have right now is an old XP laptop with 512 megs of RAM, won’t have a newer computer for another 10-15 days (got an excellent dell direct deal but shipping and delivery is absurdly slow). I have done plenty of desktop support and home computer repair for a living, but have been retired since 2014 and my Data recovery experience is limited. What I need most right now is a method to identify which am

Bitcoin actual value Bitcoins are purchased or mined to earn USD. Bitcoin does not standalone it is tethered to the USD. Isn't more a commodity instead of a currency? If the confidence in the dollar drops, Bitcoin has no actual standalone value. For example, if I have a freezer of pork bellies worth 1 million USD, and the dollar drops, I can trade pork bellies for goods or services, making pork bellies an independent currency. Bitcoins cannot do this. So beyond speculation measured in USD, what is the value of Bitcoins? http://ift.tt/2rVt036

Bitcoin recovery , I buy Bitcoin on https://www.coinhouse.io/ 10/10/2017 with the address 1GwV7fPX97hmavc6iNrUZUogmjpLPrPFoE By mistake of knowing I used Bitcoin.org Network Address is supported by the community in (2017) (1GwV7fPX97hmavc6iNrUZUogmjpLPrPFoE). I do not know how to recover my bitcoin ???? to which person can I request the transfer of BTC on my wallet bitcoin core ??? or nano ledger? thank you in advance for your help guy 1GwV7 ... it is not my personal address, it is the address of the municipality that was on the site https://bitcoin.org/fr/ , I did not know that one needed a address of portfolio !, coinhouse a "send" the bitcoins on this address that I gave them 1GwV7 .... i have spotted the transactions on the coinhouse blockhain on the address 1GwV7 ..., here is the data: ;;;;; 1c5a238d551b30e27043c55f971e18e04275b8286fc26d686834944250c763932017-10-25 07:27:47 19RiosGBdAkDjB2fuWGzSeg5LbrwzwEYT  1GwV7fPX97hmavc6iNrUZUogmjpLPrPFoE 0.38922 BTC (Fake Bitcoin

The Crime Scene: Over Half of Bitcoin Transactions are Used for Illegal Purposes Bitcoin is a revolutionary system able to disrupt the entire industry of finance. It is fully decentralized and, therefore, almost impossible to be controlled or tracked. Despite such potential, there is another side to this medal. By providing its users with security and anonymity, it has become the best friend of… criminals. http://ift.tt/2rRkQsK

Top 10 Lending ICOs This Month | Internal Exchange vs External Exchange | ICO Coin Count Explained In This Video We Review Our Top 10 Lending ICO Platforms, The Difference Between The Internal Exchange vs External Exchange & Why Both Are Vital For Us As Investors, and ICO Coin Count Amounts Broken Down So That You Know How To Better Pick Your Future ICO's! Check out our free Telegram chat for more up to date info. https://goo.gl/Ci8JWK Make money with bitcoin and cryptocurrency with Bitcoin Networker! http://ift.tt/2yGaLwP Get all the tools, training, and information you'll need to maximize your passive income opportunities in cryptocurrency when you join Bitcoin Networker today. Following the PIBTAC-V method of ICO investing, we are able to isolate a specific niche cryptocurrency that typically 3x - 20x in just 60 days, plus they pay out daily dividends just like "preferred stocks"! These daily dividends are making our members very wealthy while creating long te

Decentralised Marketplace And Content Sharing Platform ImmVRse are Poised To Disrupt The VR Industry Virtual reality (VR) has taken off as one of the most popular and innovative technologies of the last 10 years and will have an even bigger part to play in people’s lives over the next decade. Recent Goldman Sachs statistics suggest that VR revenue has the capability to reach something close to $110 billion by 2025.  The groundbreaking new technology is already becoming implemented into the medical, gaming, manufacturing and educational sectors where sizable investments have been made in both hardware and software. http://ift.tt/2Ft3wfn

Framework for designing Blockchain (in combination with secure multi-party computation) I'm looking for a framework where I can build my own blockchain. In my case I wan't to combine the blockchain with secure multi-party computation algorithm. Means that two or more parties want to exchange data without revealing the input data... are there any good framework you can recommend? (Free or academic access etc.) I found Openchain and Nstratis... maybe there are better ones? Thanks in advance. http://ift.tt/2nvuDiP

Get Historical Bitcoin Prices on GDAX in CSV Format I'm looking for minute by minute historical Bitcoin price data for the past year in format: time, open, high, low etc. I code in Java and I'm not familiar with other programming languages (such as python and PHP). I've read this (and this ) thread with the following suggestions: https://min-api.cryptocompare.com - I do not see GDAX listed as one of the supported exchanges (based on this link https://www.cryptocompare.com/api/ ) (unless the data from Coinbase is exactly the same as the data from GDAX? I know GDAX is the parent company of Coinbase but not sure if trading data is exactly the same..) Also, I tried using this API and it seems to limit the history to several days. I was not able to get a year's worth of minute by minute data for Bitcoin USD pair. https://github.com/ccxt/ccxt - this seems to be trading library written in python and PHP (but no Java support). Also I'm not sure if this allows you

Fintech and Blockchain Luminaries Announces The Launch of International Digital Asset Exchange Council (“IDAXC”) For Mainstream Digital Asset Sector The International Digital Asset Exchange Council, IDAXC, was formally launched at the recently concluded “Blockchain Central” event in Davos. http://ift.tt/2nugHFM

automatic wallet.dat I installed a bitcoin-qt and received a transaction. Few minutes later, the pc crashed,after restoration of the pc,I only saw an automatic saved wallet.dat file I tried to recover fund but no avail. Please help me to restore my fund http://ift.tt/2nq6Lgg

Why am I getting drastically different results from running estimatesmartfee on different nodes? I have deployed own bitcoin-core node recently. Now when I try running "estimatesmartfee 2" from the console I get "feerate": 0.00031175. When at the same time I query https://estimatefee.com/n/2 (they say they use the same command output) I get 0.00191157 It is different by more than 6 times! Is my setup wrong? The bitcoin-core seems to be synced and correctly shows the last block number available elsewhere on the net. I have also launched feesim on the same box, it is still converging, if it matters. http://ift.tt/2FuHWaD

How do exchanges use cold bitcoin wallet while still able to automate transfers? Some exchanges mentions they use a cold wallet to keep the private key. As far as I understand cold wallet is a wallet either in an offline machine or kept in hardware. However, it appears that transfers can still be made online on these exchanges and the underlying system will automate the signing of transaction. How do exchanges able to maintain a cold wallet while still able to automate the process? Is it by setting up local network with limited access or by other means? http://ift.tt/2DWN8H5

Why does namecoin have the redundant name_firstupdate step? I am trying to understand the namecoin protocol. As can be read in the namecoin documentation , in order to register a domain, you need to execute the following steps: Execute the command name_new, this pre-oders a domain name. Execute the command name_firstupdate, this finalizes the registration, name becomes public. Why does this second redundant step exist? Wouldn't it make more sense to merge these two commands, and enable users to finalize a registration by updating a domain directly when registering it with name_new? http://ift.tt/2FuMJZy

Calculate price &amp; spread for Market Making strategy I am developing a CryptoCurrency Market Maker bot. Now, I have succeeded in fetching programmatically: the last 100 bids ordered from higher to lower (Price * Quantity) ; the last 100 asks ordered from lower to higher ; Now, how can I calculate the suitable price and spread. What indicators to take into consideration to estimate a fair price and bid/ask spread. I am looking for some practical hints and or/formulas. http://ift.tt/2E1Dwe8

what happens to UTXOs when a transaction output script is satisfied? As per my understanding from the book "Mastering bitcoin", a transaction output contains three things Amount - Bitcoin Value in Satoshis Locking-Script-Size - Locking-Script length in bytes, to follow Locking-Script -A script defining the conditions needed to spend the output Now let us say a transaction input points to UTXOs mentioned in one of the transaction output through transaction hash and a validation software is able satisfy the scriptPubKey(locking script) using script‐ Sig(unlocking script). Questions regarding this case What would happen to the UTXOs mentioned in the output of parent transaction? Would it get vanished in the transaction or any change would happen? Only a valid transaction that correctly satisfies the conditions of the UTXO results in the UTXO being marked as “spent” and removed from the set of available (unspent) UTXO. This was a statement from the book, now is th

Founders of the Fresh Vegetable Delivery ICO Left ‘Penis’ to Investors The Prodeum startup that claimed to be an Ethereum blockchain-based system created to ensure fresh vegetable delivery has disappeared a week after the beginning of its ICO, leaving investors only with a short note speaking for itself… http://ift.tt/2DMHEPD

Blockchain Based VR Marketplace Developer VRT World Completes Pre-Tokensale, Strengthens Advisory Board with Peter Sin and Dr. Marco Sacco VRT World ( http://vrt.world , formerly VR Technologies) has successfully completed its pre-tokensale that started on December 5, 2017 and closed on January 5th, 2018. A total of $721,000 were raised during the pre-tokensale with 294 investors from 21 countries contributing, which indicates strong positive acclaim from the crypto community and venture investors. Earlier in September 2017, the company has undertaken a limited pre-sale of VRT tokens to a group of private investors totaling $350,000. Together with the pre-tokensale, this brings funding collected by the company to $1,071,000. http://ift.tt/2Eq8zOA

Kazakhstan to Accept Traffic Fines Payments in Bitcoin Following the Example of South Africa Despite the debates around Bitcoin on whether it may be considered money, there are more and more payment options appearing for it in the market. http://ift.tt/2FsQb6L

How to set up DNS seed node for a alt-coin? I am a new in blockchain and I have just clone source of crave coin to learn. After set up coinbase successfully, I see that DNS seed node but I don't know how to set up it. Please help me, thank you! http://ift.tt/2DZ44fP

Creating watch wallet from master public key at command line? I know that by electrum -w WALLET_PATH create a usual wallet can be created. I'm now looking for way to create wallet file from master public key. Question Given I have master master public key, e.g. xpub12345...ABCDE, how can I create its watching wallet file? http://ift.tt/2FtgcD1

One private key generate many public keys? I created wallet in BitPay. I have public and private keys. Then I created wallet in Electrum using existing private key. Now wallet in electrum has other public key than in BitPay but the same private key. Is it ok? Addresses generated in one application can be visible in second one? Where can I read about rules of generation keys and addresses described in simple words? I generated wallet in electrum using the same private key second time and i obtained the same public key like last time I generated on electrum, but not the same like in BitPay wallet. I do not understand why. http://ift.tt/2DZ3S05

Error when transferring BTC from one address to another address While creating bitcoin exchange, when transferring BTC from one address to another address, I got the following error: [root@mail4 ~]# curl "http://localhost:3030/merchant/b95d272b-34fa-4cb5-8ca5-d5c1e0e29a97/payment?password=@1234567890#&to=b84a2cf1-fb7a-45dd-975c-3542ea1af64e&amount=10000&from=b95d272b-34fa-4cb5-8ca5-d5c1e0e29a97&fee=100100" No destination set. No origin set. 1515140164672 - error: ERR_BUILDTX http://ift.tt/2Fu0p70

How to recover my Copay wallet using the 12 word seed phrase I'm new to Bitcoin/Copay. I decided to signup at coinbase deposited $80. I read you needed a wallet. I decided on copay. Transferred the funds to my wallet. Everything processed smoothly and my copay wallet showed $76. I then went to the merchant and tried to pay. A spend password popped up. i couldn't remember the password. I may have mixed it up with my coinbase password instead. I then did a little digging online and read that I could delete copay from my Android phone and reinstall it using the 12 word phrase to by pass/reset spending password. I did that. Now if I restore using only the phrase it creates a "Personal Wallet" with no funds in it. If I try and restore wallet with 12 word phrase and try and guess the recovery phrase password (Under Advanced Options) I get an error saying "Could not access the wallet at the server Please Check The password of the recovery phrase (if Set) The derivatio

Use multiple GPU's with oclvanitygen Does anyone know how to use multiple GPU's with oclvanitygen? I have these two: Available OpenCL platforms: 0: [Intel(R) Corporation] Intel(R) OpenCL 0: [Intel(R) Corporation] Intel(R) 1: [Intel(R) Corporation] Intel(R) HD Gra 1: [NVIDIA Corporation] NVIDIA CUDA 0: [NVIDIA Corporation] GeForce GT 630M What would be the command for using both of them if I want an address that starts with 1MYbtc? http://ift.tt/2FutWNI

A 3D Printable PCI-E Riser Lock Can Save a Lot of Headaches Every time you get new PCI-E risers for a new GPU mining rig you may be surprised with build varying build quality and that can affect the stability of the system you are building. Even when the quality is fine there is another common problem that the standard PCI Express risers using USB 3.0 cable printed upwards exhibit – they have the tendency to move a bit in the slot and even at times disconnect. This can cause a bad connection or even a broken one and one or more of your GPUs suddenly disappearing from the miner and you starting to wonder what happened and diagnosing the whole system to find the culprit. Fortunately there is a simple solution available if you have a 3D printer or a friend with one that can help you print a small and simple, yet very effective PCI-E Riser Lock. The 3D model is available for free on the Thingiverse website made by a user called totembe who is accepting Vertcoin tips from happy users of

Bitfinite Coin (BFC) | Bitfintite ICO & Exchange Will Moon...This Is Why | New 5k Bitfinite Loan Bitfinite Coin is poised to launch their own exchange and that will moon the coin making it an extremely successful ICO! Check out their new site https://goo.gl/JNm4ry and join the Bitfintite exchange launch today! https://youtu.be/p1hP5jjkNhk Bitfininite is an open source all in one peer to peer decentralized crypto community developed to provide several investment opportunities where it is entirely possible to fine the independence we all desire. Bitfinite Coin (BFC), the alt coin for the Bitfinite crypto community will provide immense value to holders. Continuous investment in R&D ensures that coin value remains at peak prosperity. Make money with bitcoin and cryptocurrency with Bitcoin Networker! http://ift.tt/2yGaLwP Get all the tools, training, and information you'll need to maximize your passive income opportunities in cryptocurrency when you join Bitcoin Networker today

How can you consolidate your personal UTXO set? (different wallet answers welcomed) With network fees so low at the moment, I've seen a lot of recommendations to take the opportunity to move funds to segwit addresses and consolidate your UTXO set. During peak congestion, many smaller UTXOs were simply not economical to spend and this is likely to occur again in the future. However I haven't found a definitive guide on how to actually do this. I'm using the Ledger Nano S Bitcoin wallet, which doesn't provide the most granular control over software tradeoffs but not the most abstracted away either. As far as I can tell from the interphase I have two UTXOs in the wallet, one with the majority of my coins and one tiny one of change that I'd like to combine into the larger amount. I thought this would be as simple as spending the full wallet amount to a new receiving address for the same wallet, and watch as the two inputs were combined into two outputs. However when I

hash locked multisig, can one cosigner sign without the pre-image? Consider Alice and Bob created the following native segwit script: hash SHA256 defined as H | Alice PubKey | Bob Pubkey Only Bob has the pre-image (plain text that hashes [sha256] to H). Can Alice just sign a transaction without revealing H, and just hand over the partially signed transaction off chain to Bob so he can reveal H + add his signature, make the transaction final and spend it? The catch here is that neither Alice and Bob to be in total and exclusive control of the funds, but for Bob to have to reveal an additional secret as spending condition. http://ift.tt/2DNiK2m

In case of a double spend (after double spend and prior getting resolved) what is actual account balance? For eg. if Ta and Tb are a double spend of the same transaction with different outputs. These two transactions can flow through different path in the network, and assume flow in exactly opposite path. So Ta reaches miner Ma who creates a block and Tb reaches another miner Mb. Now, Ma may solve the block with Ta and Mb with Tb. Both start broadcasting the respective blocks with Ta and Tb to be a part of block chain (fork created here). After fork is created and before it is resolved, what is actual balance appearing on the account? Is it double down and gets credited later on? http://ift.tt/2nqfG1k

How do honest mining pools generally divide their rewards? I've been reading a little about mining pools and the Stratum protocol for requesting work from mining pools and it got me to wondering. How does an honest mining pool divide up rewards? I see that the protocol allows for workers to request work from the pool, but how does the mining pool know how much work each worker has done? As far as I can tell, workers only report back to the mining pool when they have "solved" a hash and want to submit their answer for consideration. But what if that worker just lucky and there are other miners who have done much more work -- do they get paid the same? Similarly does a miner who is in the pool but hasn't solved anything get paid anything? http://ift.tt/2DPPjgk

transaction inputs does not have prev_out field I found some transaction inputs does not contain prev_out field, i.e. it does not have input address. It only has an output address. Does this mean this kind of transactions records the activities of mining new coins? e.g. 'tx': [{'hash': '2b1f06c2401d3b49a33c3f5ad5864c0bc70044c4068f9174546f3cfc1887d5ba', 'inputs': [{'script': '04ffff001d0138', 'sequence': 4294967295, 'witness': ''}], 'lock_time': 0, 'out': [{'addr': '1HwmP33SaknLYShXfjVU8KmVThU3JiuVgH', 'n': 0, 'script': '41045e071dedd1ed03721c6e9bba28fc276795421a378637fb41090192bb9f208630dcbac5862a3baeb9df3ca6e4e256b7fd2404824c20198ca1b004ee2197866433ac', 'spent': False, 'tx_index': 15066, 'type': 0, 'value': 5000000000}], while for another transation: {'hash': 'ee475443f1fbfff84ffba43ba092a70d291df233bd1428f3d0

Mining &amp; The Double Spending Dilemma My understanding of the double spending problem is as follows: Suppose account A has 1 Bitcoin and sends it to account B and then creates another transaction which sends the same Bitcoin to account C. Some nodes may be notified about the first transaction first while other nodes may be notified of the second transaction first, leading to a conflict regarding which transaction actually occurred first and is the legitimate one. If I understand correctly, mining solves this problem by forcing each miner to choose between one of the two transactions. But what happens if two miners receive two distinct transactions (A -> B vs. A -> C) and produce a hash at exactly the same time - won't each one still record a different sequence of events? On a similar note, what happens if miners disagree about who produced the hash first? What happens if two nodes produce a hash at exactly the same moment? Some nodes will say miner x mined earlier o

running dns seeder in website host I have a server using bind9 for dns. I would like to setup dns seeder in it. should I use one of them in server as I read that seeder connect to dns port too? or it is possible to use them in one server together. http://ift.tt/2npk3tm

OP_CHECKLOCKTIMEVERIFY / OP_HODL script Can someone please explain how I can use OP_CHECKLOCKTIMEVERIFY or OP_HODL to lock funds until block 600000? I have been searching for a newb friendly script but the only ones I have come across is for nLocktime http://ift.tt/2DLSs0C

How to create a blockchain snapshot for a hardfork? I've done source forks (altcoins) and I understand how those work. But I'm a little stuck on how forks are activated? I need to know how blockchain snapshots are created and how the wallets know to distribute the initial fork offerings? If anyone could point me to a particular commit and/or PR of Bitcoin Cash or Gold where this logic is, I'd be very grateful. http://ift.tt/2npCcHB

I have set blockgeneration time to 15 second but blocks are generated with the speed of 1 block per min(avg) I have forked Litcoin to make my own costomized coin(learning purpose), with some changes in parameters: 1. Total no of coins to be mined = 270,000,000. 2. Block formation time = 15sec. 3. Time for halving = 2 years. 4. Life span for mining = 20 years. 5. Mining reward coins per block for first 2 years = 32.16899445. 6. Total no of coins to be mined in first 2 years = 135264187.8669276 Every thing is working ok but blockgeneration time seems to be too slow. Though conformation time of 15 sec is just an avg value but in my case i am getting conformation in every 2 to 3 min which is far beyond expected Edit:I have set my difficulty to be as low as possible which is around 0.002 and retargeting time is set to 10 min, but even after of 3 days of minning i got somewhere around 3400 blocks,and also its difficulty is same in every block though i am doing number of transaction

Blockchain Summit Kyiv 2018 26 April 2018 will take place the Blockchain Summit Kyiv 2018, which will gather more than 800 participants and 30 speakers from around the world. http://ift.tt/2FpKl69

International Blockchain Summit Moscow 2018 March 1, 2018 will be International Blockchain Summit Moscow, which will gather more than 1000 participants and 30 speakers from around the world. http://ift.tt/2rPSlvd

Bitcoin Speed: 7 Transactions Per Second? I read somewhere that Bitcoin can only handle 7 transactions per second. This works out to 604,800 transactions per day. Visa currently processes about 1,700 transactions per second (and can handle vastly higher amounts than this). This means that the Bitcoin system can handle less than 1/200 of Visa's current processing output. Is this correct? I find it hard to believe that so many people would buy into a system that's so inefficient / unscalable. Also, if my assumption is correct, suppose there are (on avg) 700 transactions per second during a given 10 min period (i.e, 70 times the max output rate) does this mean we will need to wait 70 * 10 min for all those transactions to be confirmed? If yes, why can't some evil actor overwhelm (i.e, postpone) the system by submitting thousands of tiny transactions to the network? Thanks in advance http://ift.tt/2rPvUq5

Revain Releases Version 0.4 of Its Flagship Dashboard Service The first release of the 2018 is here. Today Revain is announcing next step in the development of its blockchain-based review platform. The company just released version 0.4 of its flagship Dashboard service. After several iterations aimed to test some core functions, Revain is finally adding first 15 projects to the platform. http://ift.tt/2DFyzEp

how does a node searches a transaction among various blocks in blockchain? Let me express what I have got to know about blockchain and where am I stuck. Transactions are stored in the form of merkel trees inside a block. (I know how a merkel tree is made). A merkel root is calculated and stored in the block header. An SPV can ask a full node about the balance of an address (which is an encryption of public key). Now a full node is supposed to give merkel root hash of all the blocks which contain the transactions( which contains the UTXOs which can be spent by the private key holder by unlocking its output script using its digital signature). I want to know how does the full node get to know which blocks exactly contains those UTXOs? Does it the traverse merkel tree of each block till genesis block? or is there any way to know if the block contains those transaction or not just by utilising its merkel root. http://ift.tt/2rRLXnc

Altcoin creation, mined 70 but now peers don't connect anymore Created my own altcoin (Dash fork) Created the genesis block on main, tesnet and regnet, OK Created 2 nodes that were connected and mined for now 70blocks But all of a sudden, they don't connect anymore, I get this in debug.log socket recv error Connection reset by peer (104) 2018-01-29 15:26:55 ThreadSocketHandler -- removing node: peer=4151 addr=(vps address) Need some help please! http://ift.tt/2rRYN4Y

Does anyone know specifically what are all the entities behind Ripple and who runs / owns them? As far as I'm concerned, there are Ripple Labs and Ripple Foundation, but I couldn't find any good resource providing more details on each of them. I was wondering what their business model is and how it works. Thank you in advance. http://ift.tt/2rJX29S

error while creating bitcoin exchnage when transfering btc from one address to another addrrss.? [root@mail4 ~]# curl " http://localhost:3030/merchant/b95d272b-34fa-4cb5-8ca5-d5c1e0e29a97/payment?password=@1234567890#&to=b84a2cf1-fb7a-45dd-975c-3542ea1af64e&amount=10000&from=b95d272b-34fa-4cb5-8ca5-d5c1e0e29a97&fee=100100 " No destination set. No origin set. 1515140164672 - error: ERR_BUILDTX http://ift.tt/2rRYG9y

How to activate a chain fork, so it knows to switch to a different network after the specified fork height? I've done source forks (altcoins) and I understand how those work. But I'm a little stuck on how forks are activated? I've looked into the Bitcoin Cash and Gold repos on Github and while the former seems to be retaining the Bitcoin ports, at least in the chainparams.cpp, BTC Gold changes that as well. What I'm trying to understand is, how would I allow my client to connect to BTC peers until the fork height and immediately switch to the new network? If I understand this correctly, Bitcoin Cash seemingly refers to a different set of configurations after the fork, which makes sense, but I can't seem to find how Gold does it and whether there is a better approach? http://ift.tt/2njCX5S

Does Bitcoin have a legal expert/team that does their work? Does Bitcoin have a legal expert/team that does their work? (yes, they are a decentralized network but some of those do have offices, etc.) Are there any private individuals who have (ever) started an action on behalf of Bitcoin? http://ift.tt/2BBDJ28

Price feed for bitcoin tradin Robinhood has launched bitcoin trading within the app: https://techcrunch.com/2018/01/25/free-cryptocurrency-trading-app/ While the market has not launched they do have a price feed. Anyone knows where they are getting the prices? http://ift.tt/2GsRvYW

Can cryptocurrencies never be fully decentralized because finding peers is centralized? When initially running a cryptocurrency client, it needs to fetch peers from a centralized source. If an attacker gains control of all of a client's default peers servers, they would be able to restrict the client's access to the rest of the peers. Then, they can give the client fake data and there would be no way for the client to tell. Are we just ignoring this issue because it'll be hard to gain control of the servers? http://ift.tt/2rOEqFW

bitcoin node with unspent (UTXO) index? Is there any "production-ready" node software or "cloud/service"(paid) with UTXO indexes available via RPC for all the addresses from the blockchain (i.e. something like https://blockchain.info/api/blockchain_api ) ? I recently tried bitpay bitcore insight API and after a week of waiting for sync i've found out that it is broken is most likely abandoned too so I can't really risk another week. http://ift.tt/2rOEpSo

How does TradingView get every tick from Bittrex when API retrieves every 5 seconds only? How does TradingView get every tick from Bittrex? I tried to subscribe to Bittrex's ticks with node.js + node.bittrex.api. But it get ticks every 5 seconds. So I miss many ticks between that sleep time. How does TradingView get every tick from Bittrex? http://ift.tt/2rNdLt1

BlockChain get the list of public address generated by xpub key This Link transaction is the transaction that is confirmed, and the address is generated by xpub (programmatically). Base on the link it's stated the transaction is confirmed but my account wallet doesn't have the record or balance update. Is there a way to get the list of address that's generate by xpub? I would like to verify why my xpub account doesn't receive the bitcoin. http://ift.tt/2rLzSQF

Is it possible to send BTC out of an exchange account, in order to bypass the private key management system Inspired by this other question , I wanted to ask a question related to how the private keys are managed by the different exchanges. The question is: do any of the exchanges allow the sending of bitcoins to external wallet addresses? (My reason for asking this is that I was thinking it would allow the user to send bitcoins to an address controlled by himself and then get around the enforced private-key management system.) http://ift.tt/2rJSUqI

Bitcoin cash testnet core crash Everytime when i run bitcoin cash testnet core on raspberry pi 3, it just stops for some reason and debug logs end at loading wallet. So does the raspberry pi 3 cant handle bitcoin cash testnet wallet? Here is the log that ends everytime: 2018-01-29 00:53:20 init message: Loading wallet... http://ift.tt/2rOz9y1

How do I get Bitcoin block header data with nonce? How do I get Bitcoin block header data with nonce? There are tens of so called blockchain explorer websites, tens more offering on-line Bitcoin blockchain parsing. But all I need are historic Bitcoin blockchain header data only for off-line mode study. In theory I can set up blockchain parser on my own but I need to download full blockchain first and set up parser. Since I live on wireless Internet 3G, it's not feasible to download 500GB data, so I would prefer an option just to buy historic Bitcoin blockchain header only data, no overheads, no transaction data. If you know such place or can offer such download, let me know your terms. http://ift.tt/2rOLQsI

What is a millisatoshi? I thought satoshi is the smallest unit? I encountered 'millisatoshi' (msat) while browsing Lightning Network..., see screenshoot below: And subsequently I found it mentioned here: https://github.com/ElementsProject/lightning/blob/master/README.md#sending-and-receiving-payments Obviously, I am curious... I thought satoshi is the smallest unit? http://ift.tt/2EjaFQ6

Do miners keep a &quot;balance&quot; of how much each public key has? I am trying to understand how double spending can be prevented if mining nodes do not keep a current "balance" of BTC associated with an account? If they do keep the current balance isn't this a problem as the number of potential accounts is very, very large? That is, if each account balance takes up space in memory, and more accounts are created then the only way nodes can keep up is when the rate of growth of accounts is less than the rate of growth of available memory per node? Am I missing something? http://ift.tt/2DIueo1

Has anyone else ever had issues on whaleclub.com? Whalelcub.com refusing to transfer my btc from one wallet address to another operated and managed by their site. Has anyone else ever had similar issues with this problem on whaleclub or any other exchange? http://ift.tt/2njEeZK

How to buy Bitcoin block header data - nonce included? how to buy Bitcoin block header data - nonce included ? There are tens of so called blockchain explorer websites, tens more offering on-line Bitcoin blockchain parsing. But all I need are historic Bitcoin blockchain header data only for off-line mode study. In theory I can set up blockchain parser on my own but I need to download full blockchain first and set up parser. Since I live on wireless Internet 3G, it's not feasible to download 500GB data, so I would prefer an option just to buy historic Bitcoin blockchain header only data, no overheads, no transaction data. If you know such place or can offer such download, let me know your terms. greetings, darius http://ift.tt/2DKpxKk

Exchange trying to scam me out of 0.0228 BTC! A very long story short is that on 12/3/17 I was making my Second BTC deposit on Whaleclub.com and the wallet address for my account with them had suddenly changed right prior to me sending the fund. I noticed what happen right away and had contacted their support staff and told them what happend. now for over a month now my 0.0228 BTC have been sitting uselessly in a dormant wallet address on Whaleclub.com and have gone down obviously significantly in value since the price then compared to now. Now the screwed up part is that i have been emailing these people about ten times and all they have said is that they are checking if their blockchain provider can recover my private key for that address or if my funds can be recovered and more or less them BS'ing me each email saying they are still waiting to see if it is possible to recover my funds. Its completely obvious they are trying to screw me out of my money and there is no reason at a

Blockchain.info api I am testing bitcoin transactions in the testnet using socket api from blockchain.info. The problem that I am experiencing is that when a transaction happens I can see it and inspect it, the transaction hash and the amount of money are accurate but the addresses that the transaction is made from and to are different from the ones I created the transaction. What is going on there ? http://ift.tt/2DLwWt2

My wife swears she bought $30.00 worth of this before Mom passed. What I am seeing is there is not a easy way to find a old account? Been searching for a answer to find a old account from approx. 7 years ago. not seeing a lot of good news http://ift.tt/2DNq0v6

getting worried about my coins.been waiting hours [on hold] I did a transfer from my blockchain wallet to a local-bitcoins wallet hours ago and still, they have not reached, they are showing as sent from my blockchain wallet and this is the address they are going to..3Q3aUUGpn4xKrsDfHQ7A65nXmva7CMsGnN any ideas or suggestions would be greatly appreciated. http://ift.tt/2DJ7lAB

How can I calculate the true price of a coin/token? For example, according to https://medium.com/@CO1NIO/fundamental-analysis-for-cryptocurrency-46d41941ccc We will do a sample analysis with the cryptocurrency Gulden(NLG) A quick analysis shows the current float is 323 million, with 437 OS; Also looks like initial developers allocated half the float to pre-mine of 170 mil NLG, unsure how much of that has been sold. current market-cap 14 mil at 4k Satoshis or .04c, had a huge run from 100 Satoshis or 100k market-cap to peak of 10k Satoshis or 22 mil market-cap. 45 Gigahash is current network hash rate, would value each token at .0015 USD which it was priced at in the summer before the pump; so back in July it was fairly/undervalued, now its most certainly overvalued in terms of hash-rate but if people are using it then that can account for that value addition. Question: How did he calculate .0015 and reach that conclusion? http://ift.tt/2DKpyOo

Are there RPC calls for correct RBF calculations in Bitcoin Core? Imagine I have a "stuck" transaction using Bitcoin Core (with correct BIP125 signalling), and I want to "unstuck" it using RBF. Is there some RPC call for the correct fee calculation? Meaning, is there a call that would help me with creating a transaction that will be accepted in a certain block target, given the current fee estimations? Ideally in the same way the GUI version already does it. I know it is possible to calculate that using getmempoolentry (ancestorfees and ancestorsize) and estimatesmartfee, but that is non-trivial. http://ift.tt/2DJTLx5

In the case the difficulty increases as much in future, will the possible hashes run out/be insecure? As I understood, in the block hash, the amount of zero's is the nonce, like this: 0000000000000000005f54622d97866453137466737289c2500e67f6fce1cd4e When there are more blocks found than in the average of 10 minutes, the nonce will increase. Then the hash is recomputed for each value until a hash containing the required number of zero bits is found. But imagine the development of ASIC's accerlates expotentially, so the nonce for the required hash will be like this, for example: 000000000000000000000000000000000000000000000000000000000000004e I know there are more information required, but let's imagine this in 2020 if the development of new ASIC could accelerate. So in theory there are only 28 (note the position of 4 in block hash) x 28 (position of e in block hash) = 784 remaining possible hashes. Would thatn't mean that the Bitcoin ecosystem with an insane diffi

Confused about BTC and BTH Just a quick question, I been cloud mining Bitcoin Core, but i just realized that i used a Bitcoin Cash address to mine the account. The Question is What will happen, or how can i fix this Since i used a Bitcoin Cash Address to receive Bitcoin core? i am little confused about it. Will i still Receive the Bitcoin Core even if it was sent to the same wallet address but from a Bitcoin Cash address? http://ift.tt/2BBbAbM

Has there been any cases of bitcoin being stolen without getting access to the owners private key? With this question I want to exclude cases where someone is fooled to send BTC to a person (e.g. because social engineering or malware on their PC). I have seen some arguments in comments to this Seeking Alpha article that claim that bitcoins cannot be stolen if their rightful owner is the only who has access to the private keys. Has there been any cases of bitcoin being stolen without getting access to the private key? For example: assuming that there is some exchange somewhere that allows a BTC buyer to manage their private keys outside of the exchange. Could it still be possible for e.g. a hacker to steal the BTC by manipulating the data at the exchange (outside of the blockchain). http://ift.tt/2nhVSxL

nLocktime - What is it and how can I send a transaction? Can someone please explain to me how nLocktime works? We are currently at block 506503 would it be possible to send Bob 1 BTC now but lock it up until block 600000? Also is there any way I could cheat Bob by double spending that Bitcoin in nLocktime? Also how am I able to send a Bitcoin transaction using nLocktime? http://ift.tt/2BBMt8Q

How do exchanges like ShapeShift, Changelly or Evercoin cope with KYC/AML regulation? They don't require any information about their users. Most of the exchanges require user identification: so even though exchanges like ShapeShift might have corporate account on the large exchanges like Bittrex, Poloniex, Binance, shouldn't they disclose users' info to these large exchanges? http://ift.tt/2nhRQFz

Exactly what data that entering into the block hash configuration? [duplicate] This question already has an answer here: What are bitcoin miners really solving? 4 answers Exactly what data that entering into the block hash configuration? Does anyone know the answer? http://ift.tt/2BzrCD3

Is it possible to make transaction using wallet private key I have a private key of a bitcoin wallet . Is there is any way i can check balance and make transaction using bitcoin core without importing private key. http://ift.tt/2neZCAf

Is the Whoppercoin project still alive? I heard about Whoppercoin but I can't find informations after August 2017. Is the project still alive ? http://ift.tt/2ByIQAr

Sendig bitcoin created before the fork of aug 2017 Does anyone have any experience sending bitcoin, prior to the hard fork of August 2017 to a nano S adress. Is the nano S able to make the split between BCH and BTC? http://ift.tt/2njbEZv

Watching-only wallet electrum / ethereum on ios is there any apps for iOS that exist that can create a watching wallet for an electrum cold storage and Ethereum paper storage? Just seeing if I can consolidate apps and keep the balance monitored in one app rather than in multiple. http://ift.tt/2BAu6Rl

Where can I find sellers selling Bitcoin in bulk Group of investors buying bitcoins in bulk. 1300 BTC bought already. Need more. Country no bar, payment in cash or wire transfer. http://ift.tt/2nhqAHf

Code to mine genesis block, throwing out errors I'm following : http://dillingers.com/blog/2015/04/18/how-to-make-an-altcoin/ and when i put the following code : hashGenesisBlock = uint256("0x01"); if (true && genesis.GetHash() != hashGenesisBlock); ( Logprintf("recalculating params for mainnet.\n"); Logprintf("old mainnet genesis nonce: %s\n", genesis.nNonce.ToString().c_str()); Logprintf("old mainnet genesis hash: %s\n", hashGenesisBlock.ToString().c_str()); // deliberately empty for loop finds nonce value. for(genesis.nNonce == 0; genesis.GetHash() > bnProofOfWorkLimit; genesis.nNonce++){ }; Logprintf("new mainnet genesis merkle root: %s\n", genesis.hashMerkleRoot.ToString().c_str()); Logprintf("new mainnet genesis nonce: %s\n", genesis.nNonce.ToString().c_str()); Logprintf("new mainnet genesis hash: %s\n", genesis.GetHash().

Will Lightning be implemented on Bitcoin network? Lightning cannot currently operate with pruned nodes. I presume without limitation the same applies to SPV nodes. Will Lightning be implemented on the Bitcoin network? http://ift.tt/2nhqsHL

What is milisatoshi? I thought satoshi is the smallest unit? I encountered 'milisatoshi' (msat) while browsing Lightning Network..., see screenshoot below: And subsequently I found it mentioned here: https://github.com/ElementsProject/lightning/blob/master/README.md#sending-and-receiving-payments Obviously I am curious... I thought satoshi is the smallest unit? http://ift.tt/2BzkUwT

Segwit change address from Regular address I would like to move my bitcoins to a Segwit Electrum wallet, however - I don't want to pay the high fees for the initial transfer. I though about using the change address, so that when I make payments with the regular Electrum bitcoin wallet, the change will be automatically sent to the Segwit address. Is it possible with the non-Segwit Electrum wallet? How do I set it up? http://ift.tt/2nhqjEd

Bitcoin Mining: Building a block I am not able to figure out how to build a hexadecimal block, if I have all the needed information (Hash, Merkel Root, etc.). Please use this JSON formatted block as reference: Block #1 Thanks For Your Help! http://ift.tt/2Bx3FMp

How to update and older version of electrum on ubuntu 17? I used the following commands to install electrum: sudo apt-get install python3-setuptools python3-pyqt5 python3-pip sudo pip3 install https://download.electrum.org/3.0.5/Electrum-3.0.5.tar.gz In the future, how would I go about updating electrum? What command would I use to update? Also, where are the electrum files installed that contains my private keys and wallet? http://ift.tt/2nj9x7M

What is Transaction Malleability? The Bitcoin exchange MtGox has stated in this press release that "transaction malleability" caused them to stop sending bitcoins. A recent question asked if it really is an issue. But what is transaction malleability in the first place? http://ift.tt/2ByIcmj

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Crowdsale and Smart Contracts (Number) I just need a quick clarification for crowdsale. If i have 3 rounds of crowdsale, do i need to write and execute 3 different programs at different times or submit all at a time under one program? Thanks in advance http://ift.tt/2Fp4l9b

How does total cost of mining affect the price of coins? The goal of this question is to explore what the correlation is between the cost of the total energy consumption behind a PoW based cryptocurrency and its price. Obviously, the cost of mining cannot be lower (in the long run) than the price of the coin, because more and more miners wold join. But is the converse (empirically) also true? Have the price of coins been historically bounded from below by the cost of mining? Of course, the cost of mining is hard to compute, because of differences in hardware, electricity price and cryptojacking. Yet, one can find some nice charts here about Bitcoin, so some estimates can be made. Has anyone looked at this? For example, the market cap of Bitcoin is about twice the market cap of Ethereum. Is it true that about twice as much energy is/has been spent on Bitcoin than on Ethereum? http://ift.tt/2DSmJtS

Why does bitcoin mining take so long? I was wondering that a block (Here's a Block #506398 ) It's nonce is 1,229,291,212 (A little over a billion), Then why does it take so long to mine a block because my system alone can do about 500 GH/s (500,000,000,000 Hashs per second), Which is very little in comparison to what an ASICs can do. Then why does it take so long to mine a Block?? Thanks for your help!! http://ift.tt/2FmYlxu

Using sendmany instead of raw transaction When developing an application, is there any problem if bitcoin sending operations are done with "sendmany" operation instead of "raw transaction" operation with bitcoin sending operations ? http://ift.tt/2DUVjn0

why is the double spending problem is a problem in cryptocurrency? The bitcoin original has the "double spending problem." But in a transaction using standard currency (dollar), the double spending problem is not a problem. Why is this a problem in crypocurrency? http://ift.tt/2FngYl0

How can a 24 word seed know when I added or removed wallets at a later point? Since I do not have 50 Rep points I had to post my question this way! This is an answer by " https://bitcoin.stackexchange.com/users/56917/rstack " to the question " How do Ledger Backups get stored? " "Using words to back up wallets is a process described in BIP 39. Basically, the mnemonic is converted into a seed. This seed is then used as the seed to a Heirarchical Deterministic (HD) wallet, as laid out in BIP 32. The seed is used to generate a Master Extended Private Key, from which all other private keys can be generated. The child key generation follows the standard of BIP 44 so it is compatible with other wallets too. Thus, by backing up your mnemonic words, any time you enter them in a wallet, it can recreate the seed, then the master private key, then all your other keys, so your wallet is back." When I start my Ledger for the first time I get a generated 24 word se