Cryptocurrency Expert

Service Disruption Post Mortem – August 31st On Friday 31st August, 2018, the Bitfinex platform encountered an issue which forced us to suspend trading for a total of roughly 60 minutes. At 14.55 UTC the platform started encountering issues originating from our cloud hosting provider restarting a core matching server. Our team begun assessing the damage immediately. Here we ensured that no data was lost and we flushed the pending queues to the database. Once the integrity of the system was established, the restart and resync procedure was performed, as well as a series of automated and manual tests to ensure all functionalities were in order. A list of all executed trades during downtime can be found here . Please note in the above file that Type: Synchronising ME refers to trades executed as we recovered data that was not fully synced and saved onto our databases. All users were kept informed via twitter.com/bitfinex , as well as bitfinex.statuspage.io . We are taking concrete s

FutureBit Project Apollo: Bringing ASIC Mining Back to the Home Miner An interesting new project from the developer of the FutureBit Moonlander and FutureBit Moonlander 2 USB Litecoin ASIC miners jstefanop called FutureBit Project Apollo. The new device called the FutureBit Apollo LTC is trying to be the world’s most efficient Scrypt ASIC miner, using WiFi and actually being silent… and if it is available at a good price point we are sold. It is targeted at home miners that want to get into mining and/or play around with ASIC miners and not large scale mining operations and mining farms, though it might be interesting for bigger miners as well thanks to the promising specifications announced. FutureBit Apollo LTC miner Prototype Specifications: – Compact Stand-alone Pod Style Miner (4x6x4in). – Very wide range of operation modes with preset ECO (quiet) mode and TURBO mode. – 100-140+ MH/s of Scrypt performance per miner. – Industry leading 1W/MH in ECO mode, and 1.4W/MH for TUR

Fiat to Satoshi Relationship Is there a formula to calculate the fiat value of a Satoshi using your fiat principle? https://ift.tt/2NCxNNm

The question about "failedTx set" after add TX to new block done Try to understand the whole process of mempool working. There is one thing I can't figure out: after add TX to new block done, how to deal with those TXs in failedTx set (those TXs add to failedTx during the new block creating process)? Could anyone help me? Thanks. https://ift.tt/2PoSrRx

How to select a leader in RAFT consensus protocol Suppose a network of 5 nodes uses RAFT consensus protocol. Each nodes maintains a transactions log which consists of a list of the log entries. Each log entry again consists of index and term. All of them are marked themselves as leader candidate and send the request Vote (term, index). The current log entries (i.e. list of term and index values) of all the leader candidate nodes as follows - Then who will be the leader ? https://ift.tt/2C5wCoj

Why are all testnet transactions currently unconfirmed and all faucets empty? what is happening with btc testnet, all transactions are unconfirmed and all faucets are empty? For an example that is on of my transactions: https://live.blockcypher.com/btc-testnet/tx/d32652489a8131657ad05fba8a57bb075e16b20567c824ad67ded067f6b350c4/ https://ift.tt/2C6E3fb

I own a Blockchain wallet and wishest put mneyon it from my visa debt card how do I do that I own a blockchain wallet how do I fund it using my credit card https://ift.tt/2N6Zdhj

blockchain official documentation I am developing a system of administrative management. The project is migrating from PHP to C ++. With the new requirements we want to work with blockchain. But when looking for more about it, despites generic tutorials, I almost always find links to blockchain implementations like Bitcoin or Eterium. But I need to implement something pure, from scratch. Where can I find the official documentation of blockchain technology ?? https://ift.tt/2MCTMY9

Lightning Network: can I create a channel from a preexisting channel? If I open a channel with myself for 0.01 BTC, with one end having all, and the other having none, could I create an updated contract, or state, to send 0.001 BTC to an address owned by Alice, even though this address would not be in the blockchain, whereby she now has a valid channel with 0.001 BTC, and I have 0.009? https://ift.tt/2PRAa0d

the maximum possible entries a network can accept in RAFT consensus? Suppose a network of 5 nodes uses RAFT consensus protocol. Each nodes maintains a transactions log which consist of list of log entries. Each log entry again consist of index, term and command. The current log structure which consist of transaction log of all nodes present in the network is as follows - Then the maximum possible committed entries (i.e. the network can accept entries upto that command) are ? https://ift.tt/2MDldB4

The question about "failedTx" after add TX to new block done Try to understand the whole process of mempool working. There is one thing I can't figure out: after add TX to new block done, how to deal with those TXs in failedTx set (those TXs add to failedTx during the new block creating process)? Could anyone help me? Thanks. https://ift.tt/2PTUqhG

Skycoin Announce the Offical Release of an Android Mobile Wallet Skycoin are thrilled to announce that the first official Android version of their mobile wallet is now fully ready to be released! https://ift.tt/2C65MfY

Singularity-X Promotes Bitcoin During Real Madrid, FC Barcelona, and Atlético Madrid Matches The promotion of Bitcoin during Real Madrid, FC Barcelona and Atlético Madrid matches. Singularity-X has exceeded all expectations: the crypto exchange promoted Bitcoin trading at no charge across Europe during several live broadcasts. https://ift.tt/2wpONjp

CloudMoolah’s XMOO is Listed on Coinsuper Following a successful US$15 million Token Sale in April 2018, Cloud Alliance’s (commonly known as CloudMoolah) MOO Token (XMOO) has successfully listed on Coinsuper as its first exchange. Coinsuper will open trading for XMOO/ETH trading pair at 2018/08/29 6:00 PM (UTC+8). Deposits were available as of 2018/08/29 2:00 PM (UTC+8). https://ift.tt/2Nc9s4d

Global's First 'Blockchain University' Looks For Accreditation from Tech Hub Malta The global's first university powered by Blockchain technology could set up shop in Malta, and academics from some of the global's top universities have already signed up, as per reports from Medium on August 24. https://ift.tt/2Ps1IZl

The First Use of Blockchain in Russia, Gazprom Neft Improves Aviation Refuelling Russia has always taken financial technology cautiously and regarded it as a very unstable and volatile thing. However, Gazpromneft-Aero and S7 Airlines finally took a risk and implemented blockchain in their field. The new technology helps to improve processing time and efficiency during aviation refuelling. https://ift.tt/2Pnldlx

Elon Musk Believes Ethereum is a Scam, No ETH Giveaways Elon Musk, the maniac, the myth, the brick, the legend? Whatever you take him to be, you can't deny that he has an ill-famed presence within crypto. According to recent reports, he's now on the bandwagon of Ethereum, although he is suspicious that it could be a scam. https://ift.tt/2C5lAQ4

why 'extern' was used in the noui.h file? When i review the source code, i find that the noui.h is a header file, but the method noui_connect has been declared by key words 'extern'. i think there is no need to do this. extern void noui_connect(); https://ift.tt/2PTFO1Z

Get the price of a currency at specific time in the past using binance historical data api I want to query the binance api for historical data but i want to indicate the specific time i want. For instance i want to know the price of etherum at 1103 hours Friday 31 August 2018. Is this kind of thing possible on binance api?. https://ift.tt/2wCiYEf

Restore lightning network node/channels If one wanted to restore a lightning network node, what files have to be saved? I read that saving hsm_secret is enough to restore private key(s), but I also read about a problem with channels. How channels are restored after a re-installation of lightningd and the "pasting" of hsm_secret file? And, if it is impossible to restore channels, how to force the closure of them so that one can retrieve all locked funds? https://ift.tt/2LCbSUN

Is there any way to revoke or update private key? Suppose my private key corresponding to an address is stolen. Is there any way to revoke private key or update the private key? https://ift.tt/2oo5M15

What happens if I use same k twice in DSA algorithm? To sign a message , we choose nonce k but what happens if we use same k twice to sign a message using DSA algorithm? https://ift.tt/2C20Ad2

Wich exchanges do you use to carry out cryptocurrency trades? This link has a Google form for your answer :) https://ift.tt/2N27kf8

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Yahoo Finance lists BTC, ETH and LTC | BTC.com Moving into ETH Mining | Indian State Cryptocurrency 😀 Thank You For Watching! :D For Reference: 1. https://ift.tt/2PRhnSP 2. https://ift.tt/2PhR1Z8 3. https://ift.tt/2Nwau7R 💥Bookmark Our New Forums & Join The Community Discussion! ►►Crypt0 Message Boards - https://goo.gl/YuBrTn 🚩Remember to subscribe and hit the bell "🔔" icon to get notifications as soon as I upload a new video or start a live stream! 🎩►Get Access To Our Exclusive Real-Time Telegram Chat Group: https://goo.gl/vpX5sW ___________________________ Crypto Donations Are Really Appreciated! ►💓Donate Ether and Ethereum-Based (ERC-20) Tokens: 0x1466032B4F0F13910DA35B16371807428CB40714 ►💓Donate Bitcoin: 3JKQycXHdD5yqSRTf5VabM28Ff9AfXYcJD ►💓Donate Using Paypal: https://goo.gl/7m1X4Z ___________________________ 🚩🚩MUST HAVE ►The Ledger Nano S Crypto Hardware Wallet: https://ift.tt/2nY4tYQ ___________________________ 🎁FREE STUFF ►The Brave Browser (Fast Brows

Privatekey Recovery so the question is about btc privatekey recovery . Is there any way to recover/re calculate privatekey using these details : SHA-256 RipeMD-160 public key public address rsz signatures ( non-identical R ) scriptsig asm & hex ... https://ift.tt/2N3h0WN

If SPV clients didn't exist, would Bitcoin still use Merkle trees? I understand how full nodes use Merkle proofs to convince SPV clients that certain transactions are valid / invalid. Does the Bitcoin software use Merkle trees in any other way? https://ift.tt/2Pm4Vt5

B is for Bitcoin, a Book About Bitcoin for Children “B is for Bitcoin” is an ABC book for children about Bitcoin and cryptocurrency written by Graeme Moore, and it’ll be available for purchase on Amazon in September. On the official website you can subscribe to get notified when the book is available for purchase. Could be a great way to educate children about Bitcoin and cryptocurrencies in an easy to understand way. This definitely marks another milestone in the history of Bitcoin and cryptocurrencies. – Visit the official book page for more details when it will become available… https://ift.tt/2PSfsNE

How can I convert iTunes Gifts card to Bitcoin Hello I really want to know how to convert iTunes gift cards to cans or Bitcoin https://ift.tt/2C3ntwJ

Get Ounces of buds for half price all AAA buds Hey Guys you can get top ounces of buds for half price ounces going for 90quid a pop and thats for AAA ounces of big buds, I got 2 ounces of bug buds for 185pound with tracking and i got the delivery in a few days, I got my package in super stealth and very well done, i have to say it was one of the best stealth methods i got in a long time free gift too, Plus i got 60grams from them for the price i paid, These guys are the farmers themselves and are able to sell there ounces for this price as they are the growers themselves and sell at cut prices, There ounces are whopper and cured right everything was perfect i will and i am going to be ordering more from them and anyone who likes there weed should check them out and anyone else who wants to make money should check them out,Also here is there encrypted email address teamweedforbuds@protonmail.com Here is there site https://teamweedforbuds2018.yolasite.com/ https://ift.tt/2C3t5qK

Are bitcoins (or fractions of bitcoins) labeled with IDs? Many sources describe the double spending problem by saying something like "people cannot be able to spend the same bitcoin twice." [1] [2] [3] So are bitcoins, or the smallest allowable bitcoin fractions, distinctly labeled entities? My understanding was that they are not, and that the blockchain only records information on the amount of bitcoins each user has. Also, if I am correct, what would double spending actually look like in the bitcoin system? If I send a transaction to one miner saying "I pay user X 1 bitcoin" and another transaction to a different miner saying "I pay user Y 1 bitcoin", then it seems like I haven't double-spent, but rather just paid two bitcoins in total, one to each user. Right? https://ift.tt/2wp7zY4

General private/public key generation Not sure if this is the correct forum to ask, but I couldn't find a general one for all cryptocurrencies I wanted to get an idea on how the whole cold-storage private/public key generation works for different cryptocurrencies. So I was playing around with BIP32 deriviation path on: https://iancoleman.io/bip39/#english I noticed that for example BTC, XRP, PIRL all have the same BIP32 root key and BIP32 extended private/public key, but DOGE was completely different. Why is that? BTC hashing algorithm is SHA256 and PIRL uses Scrypt, their root seeds are the same, while DOGE which uses Dagger has a different seed and private/public key. The second part that I don't understand is the generation process of addresses for different cryptocurrencies, is there a web site where I could look up on how it's done? The only one I found is for bitcoin here https://www.mobilefish.com/services/cryptocurrency/cryptocurrency.html#refMethod2 https://ift.

Parking Problems? There’s an App for That There’s an app for just about everything today, and parking is no exception. https://ift.tt/2wsi7pd

How OP_CHECKSIG knows the source of sig in pay to pubkey hash transaction https://en.bitcoin.it/wiki/Script#Standard_Transaction_to_Bitcoin_address_.28pay-to-pubkey-hash.29 The last step of pay to pubkey hash transaction is to check the signature of the previous transaction tx hash and pubkey . But how the script interpreter knows the sig the signature of the previous transition hash, what if the sig is the signature of some other content? https://ift.tt/2PSbg0K

Can I use wallet balance in satoshis as input for transaction builder ( bitcoinjs-lib )? Can I use wallet balance in satoshis as input for transaction builder using bitcoinjs-lib ? If yes, how? https://ift.tt/2LDacdC

I changed bitcoin address but the bitcoin is still stuck in the old address and i don't know how to access my former address??? Please help me I sent bitcoin to my bitcoin core app a few weeks ago, however the app wasn't synced so i tried to export the private key but it wouldn't work, it said it couldn't work for the address, so i changed address but the bitcoins remained in the previous address, i updated my hard drive so i could sync the app and now the app doesn't have my old address in my history but the coins are still in the old address, is there any way i can access the former address?? https://ift.tt/2BXg01S

address format is different from bitcoin core response from btcd For now, I'm generating WIF and address using golang btcutil package programmatically. wif, err := btcutil.NewWIF(privateKey, conf, false) if err != nil { return nil, err } strPrivateKey := wif.String() // Address address, err := child.Address(conf) walletKeys[i] = WalletKey{WIF: strPrivateKey, Address: address.String(), EncodedAddress: address.EncodeAddress()} After generating wif, I import this wif using bitcoin client importprivkey err := b.client.ImportPrivKeyRescan(privKeyWIF, label, false) And then, I make sure this private key is added into wallet using getaddressesbyaccount "label" command. Somehow listed address and first generated address seems different. I'd like to know why it's different. Thanks in advance. https://ift.tt/2PP0YOI

lolMiner 0.43 AMD and Nvidia OpenCL Multi Equihash GPU Miner If you are mining any of the popular Equihash variants for GPU you might want to check the latest lolMiner 0.43 as it is an OpenCL miner for both AMD and Nvidia GPUs that supports Equihash 144.5 (ASF, BTG, BTCZ, LitecoinZ, HeptaCoin, Safecoin, Snowgem, ZEL), Equihash 96.5 (Minexcoin) and Equihash 192.7 (ZERO & SafeCash). The main feature of the latest version is the addition of support for the 192.7 algorithm used by oins such as Zero (ZER) and SafeCash (SCASH), there are of course multiple fixes and improvements applied as well. You can find the full changelog of the lolMiner 0.43 below. The lolMiner 0.43 is a closed source miner available wih binary only releases for Windows and Linux. Do note that there is also a built-in developer fee, Equihash 144.5 and 192.7 should have 2% fee and Equihash 96.5 is with 1% fee. lolMiner 0.43 Changelog: – Added 192/7 Algorithm (Zero and SafeCash) – Added support for zergpool Equi

Talking from Experience: Wolf of Wall Street Says Bitcoin will Slaughter Investors The 'Wolf of Wall Street', Jordan Belfort, has spoken out recently against Bitcoin as the thing that is constructing an abattoir ready to slaughter its untainted investors. https://ift.tt/2PkgiBN

Synthetic BTC is 100x More Lethal Than The Real Thing, Competition Among Platforms Derivatives trading isn't new at all,  but it has been enjoying a revival of late. As the crypto market has traded askance, many traders have northed the leverage and hurried to swap Bitcoin derivatives that halsen big risk and reward. While platforms such as Deribit and Bitmex have highly profited from a gain in synthetic assets, a lot of traders have been left stranded. https://ift.tt/2LCM9LL

84% of Firms are Participating in Blockchain Tech Firms don't want to be left off of the Blockchain technology movement. The newly published report by PwC on August 28, shows that 84% of executives that were surveyed revealed that their firms are 'actively involved' with Blockchain technology. https://ift.tt/2C238I2

Lightning network: funds into channels Is there a minimum limit of bitcoin that can be added into a channel during the initialization? And, if I decided to open a channel with a lightning node, also that node has to add money to the channel? https://ift.tt/2LAN1kc

How to make sure importprivkey command worked after running As title, I'd like to know how to make sure that importprivkey command worked after running. What is understandable way? Thanks in advance. https://ift.tt/2wwNnCO

Full node vs lightning node What is the difference between a full node and a lightning (network) node? If a lightning node, that is not a full node, opens a payment channel with another lightning node, how can the first peer check that the other peer does not send a "malicious" closing-channel transaction to the blockhain? https://ift.tt/2wqPuc6

How to flush bitcoind cache? I have been working with a bitcoin full node trying to implement a personal blockchain explorer using RPC API calls to populate an external database. After trying to gather some statistics on RPC call speeds I noticed that there seems to be some form of caching. Not sure if this is cached on the daemon side or with the levelDB. My goal is to compare a getRawTransaction call for each transaction vs a batch getRawTransaction call, however caching makes it quite difficult to gather stats. Is there anyway to flush cache with bitcoind? https://ift.tt/2PKeNy1

blockchain oficial documentation I am developing a system of administrative management. The project is migrating from PHP to C ++. With the new requirements we want to work with blockchain. But when looking for more about it, despites generic tutorials, I almost always find links to blockchain implementations like Bitcoin or Eterium. But I need to implement something pure, from scratch. Where can I find the official documentation of blockchain technology ?? https://ift.tt/2MYsL0A

Access funds on legacy address related to segwit address from which I have private key The situation Hello. Our company running BTC pool. We've been mining BTC for a while and used segwit address 32Z3eXSPgxcHj2fnQy8d6dg66eVtZfxrBM as pool adress. But when we finally found a first block (actually - two blocks) for some reason block reward got sent to different address:1s2iywx94HudryMHsU2g1K9x8DB1cahGc Here are links for both generation transactions with rewards: the first and the second The problem We cannot get access to funds on 1s2iywx94HudryMHsU2g1K9x8DB1cahGc - we simple can't see that balance on the wallet. The question How can we access those funds on 1s2iywx94HudryMHsU2g1K9x8DB1cahGc? More info Using Bitcoin Core client command validateaddress we can inspect both addresses: Output for 32Z3eXSPgxcHj2fnQy8d6dg66eVtZfxrBM is { "isvalid": true, "address": "32Z3eXSPgxcHj2fnQy8d6dg66eVtZfxrBM", "scriptPubKey": "a

BlockChain Volunteer I am new to IT Project Owner/Management and I want to learn by joining a team that needs help. Can someone connect me to a team that needs help? I prefer BlockChain but any IT project will do : ) Thanks https://ift.tt/2wqAGdH

Bitcoin/PIVX JSON-RPC and CURL just returns Unauthorized No matter what I try, I cannot get a request to PIVX wallet / Blockchain Api. It works 100% in curl from CMD. curl --user user:pass --data-binary "{\"jsonrpc\": \"1.0\", \"id\": \"curltest\", \"method\": \"mnbudget\", \"params\": [\"show\"]}" -H \"content-type:text/plain;\" http://localhost:51473 (where user:pass are my rpcusername and rpcpassword in pivx.conf) I've also tried a request in this format: curl --data-binary "{\"jsonrpc\": \"1.0\", \"id\": \"curltest\", \"method\": \"mnbudget\", \"params\": [\"show\"]}" -H \"content-type:text/plain;\" http://user:pass@localhost:51473 The JSONRPC request from their docs ( https://github.com/PIVX-Project/PIVX/wiki/API-Reference-JSON-RPC ) in the .NET section throws Unauthorized, s

Crypto market growth The price of bitcoin exceeded $7000, and the market added $ 11bln per day to capitalization. It would be more such successful days :) enter link description here https://ift.tt/2PJ5A90

sendrawtransaction and txn-mempool-conflict When i sendrawtransaction to bitcoind, i get error (exceptions) 18: txn-mempool-conflict (use Bitcoin JSON-RPC denpamusic/php-bitcoinrpc ) But the transaction is sent to the network and is subsequently confirmed. Example one decoded transaction : https://jsfiddle.net/rn58a4j6/ then i send this transaction: 94ec12fc463230b4285a29b047608627c05572a4c6eabe6688a201ce49ae72f7 https://ift.tt/2MY2KP0

How could I directly, automatically accept Bitcoin as payment on my website Cryptopiece? I am currently using the Coinpayments payment system which processes Bitcoin transactions for orders. Are there any alternatives? https://ift.tt/2LEKEwV

Lightning network: channels and full nodes [on hold] Is it possible to open a channel with a peer that is not a full node? Or to exchange lightning payments between two peers that are not full nodes, they both have to open a channel with full lightning node(s)? I saw this map https://lnmainnet.gaben.win/ and I was wondering if all the graph nodes were full nodes. https://ift.tt/2NryyJ0

Is "Pinocchio zk-SNARK" a specific type of zk-SNARK? Is " Pinocchio zk-SNARK " a specific type of " zk-SNARK "? And if yes, what is difference? https://ift.tt/2CasjID

Bitcoin Core does not show incoming connections from mobile wallets I'm experimenting with various mobile wallets (Android) which let the user specify the node to connect to. I have a Bitcoin node running, it accepts incoming connections, bitcoin-cli getpeerinfo shows 10-14 peer connected, my node is also present on Bitnodes . But when I launch a mobile wallet set up to connect specifically to my node, I don't see a new incoming connection from the server's point of view. I tested it on multiple wallets ( Bitcoin wallet , BRD , GreenBits , Simple Bitcoin wallet ): sometimes my node even shows up in the mobile app's "network monitor" (not all apps have one), but not the other way around. What could be the reason behind this? https://ift.tt/2Ph0qzY

ripple transaction max amount If I send a query {"method":"sign","params":[{"secret":"shU9DWXZ1bhtaZRipiCedMUn1B2Gg","tx_json":{"Amount":9000000000,"Account":"rPa8RMPnEJxW4dpkJhnqj7GQYUB9PQ5gEW","Destination":"rH7k1edohG2XCBuTiB8RrMaKRgi2wNkXYg","DestinationTag":100008276,"TransactionType":"Payment"}}]} The testnet Ripple server ( https://s.altnet.rippletest.net:51234 ) give me Unable to parse request: * Line 1, Column 90 '9000000000' exceeds the allowable range. How can I send more than 9000 XRP at one transaction? https://ift.tt/2wqczvB

Can Bitcoin Tech be Used to Protect Journalists Over eight Nigerian journalists are currently in police detention because they published investigative news stories that didn't sit well with the government of the day. How can the bitcoin technology help journalists facing government suppression, especially regarding giving up their information sources? Can the blockchain technology be used in a way to protect journalists from having to reveal the identities of their sources? How? https://ift.tt/2wm0YxM

Bitcoin Tools for 'testers' I am writing a Bitcoin application and want to give my testers the opportunity to see what is going on on the blockchain. The plan is to test the application mainly on a local Regtest network. I did a fair amount of research to see what application there are on the market, but most of them seem to focus on Mainnet and Testnet. I am specifically looking for a blockchain explorer. The only one I could really find was bitcoin-abe. However, Abe seems to have issues with the latest versions of Bitcoin throwing a MerkleTreeMismatch exception. Does anyone know about another Blockchain Explorer that can be used for Regtest? I would also appreciate any other tools that could possibly support a Tester in understanding what is happening on the blockchain. Thanks! https://ift.tt/2NqUbJj

Can you retrieve funds send to a legacy address created with a Segwit extended private key imported in Mycelium from a Ledger Nano S? I imported a segwit xpub6-key in Mycelium as a watch only address. It only shows address starting with 1 instead of 3, which makes sense. I retrieved a small amount on the legacy address and it shows up in Mycelium and on block explorers. But as a watch only address, I cannot touch it in Mycelium, but it does not show up in my Ledger applications, as those are only showing the Segwit addresses. So, is there any way of ever touching that funds again? I found a lot of comments on sending funds from a non-segwit to segwit address, but nothing on this interesting problem. I have to add some info: - when I derive the account extended public key from other wallets but the Ledger-wallets I get an ypub6-address, which is also showing up when I write my mnemonic key in iancoleman.io (mnemonic code converter) - technically I should not have been able to import

Differences/similarities of "Bitcoin script" and "Ethereum smart contract"? Can we compare Bitcoin script and Ethereum smart contract ? And if yes, What are differences/similarities of Bitcoin script and Ethereum smart contract in sense of functionality, architecture and how to interact with blockchain? Does Bitcoin script run on-chain (similar to Ethereum smart contracts) or they run off-chain ? https://ift.tt/2LyAOwd

Bitcoin Core 0.16.2 Released Bitcoin Core version 0.16.2 is now available from: https://bitcoincore.org/bin/bitcoin-core-0.16.2/ This is a new minor version release, with various bugfixes as well as updated translations. Please report bugs using the issue tracker at GitHub: https://github.com/bitcoin/bitcoin/issues To receive security and update notifications, please subscribe to: https://bitcoincore.org/en/list/announcements/join/ How to Upgrade If you are running an older version, shut it down. Wait until it has completely shut down (which might take a few minutes for older versions), then run the installer (on Windows) or just copy over /Applications/Bitcoin-Qt (on Mac) or bitcoind/bitcoin-qt (on Linux). The first time you run version 0.15.0 or newer, your chainstate database will be converted to a new format, which will take anywhere from a few minutes to half an hour, depending on the speed of your machine. Note that the block database format also changed in version 0.8.0

Manage multiple users wallets for web wallet service This already summaries the issue I'm currently trying to figure out to calculate the transaction fee to prevent negative balance. (testnet) I tried using createrawtransaction answered . When I tried to send all balance to an address, the txid was created successfully using createrawtransaction but when I ran the fundrawtranaction on that txid it showed error code: -4 error message: Insufficient funds The goal is to calculate transaction fee before hand to check either sufficient balance is available of an account using sendfrom To manage multiple users to isolate users' balances as this . EDIT1: If using estimatesmartfee it is showing the fee: bitcoin-cli -testnet estimatesmartfee 6 { "feerate": 0.00501921, "blocks": 6 } When calling sendfrom for total balance transfer: bitcoin-cli -testnet sendfrom <account> <address> <amount> error code: -4 error message: Error: This tr

How to get output linked to input in SPV node? We're working on bitcoin SPV wallet. After setting bloom filter, we only get merkle blocks, and transactions that match the hashes we set plus some false positives. If a transaction is where we SEND coins, we can calculate a fee of that transaction, because we also HAVE previous transaction holding an output we spent. But, if a transaction is where we RECEIVE coins, then we can't calculate the fee. Because, we DON'T HAVE previous transaction holding someone's output which he spent. As far as I know, there's no way to request single transaction from peers. How can we get previous transaction or at least it's output's value? https://ift.tt/2BZ04fO

How to handle multiple inflight transactions from same address? How are multiple inflight transactions from the same address handled? From my understanding, there are two options depending on how change is handled, but both seem to have substantial drawbacks: If change for each transaction generates a new address for the change - the usual handling - then you can't handle two transactions since they will both want to use the same unspent output address. And they will both use it entirely by definition. The ergonomics of this seems poor - I can only ever do one transaction from an address at a time. In that case I would want bitcoins sent to me to always be shredded (no bills larger than $20 please). If I have change sent sent back to the original address, does it matter in what order they are added to the chain? I can't see why. This however allows everybody to track my wallet and where I'm transacting. Also I don't know if all wallets support this. Is my under

How does &quot;headers first&quot; affect BLKxxxx.dat structure? Assuming a full node running Bitcoincore v0.10 (with txindex=1), how exactly does the new "headers first" functionality affect the structure of the blockchain data? (Specifically, the blkxxxx.dat data, though perhaps I'm unaware of other files which are ancillary to the data structure). The README.md for the release specifies that there's no v0.9.x back-compatibility for v0.10 blockchain blk data. Because release 0.10.0 makes use of headers-first synchronization and parallel block download (see further), the block files and databases are not backwards-compatible with older versions of Bitcoin Core or other software: Blocks will be stored on disk out of order (in the order they are received, really), which makes it incompatible with some tools or other programs. Reindexing using earlier versions will also not work anymore as a result of this. How then, does the 0.10 version blk data get par

EasyBitcoin RPC lockunspent... cannot get it to work Has anyone succeeded in using the EasyBitcoin.php RPC tools for locking transactions? I have been trying with no avail to use that method. here is what I have been trying to do; $json = { "txid": "5a7d24cd665108c66b2d56146f244932edae4e2376b561b3d396d5ae017b9589", "vout": 0 } bitcoin->lockunspent(false,$json); and I keep getting an error like; Expected type array, got string Thanks in advance to anyone who can help me with this riddle. https://ift.tt/2PKAH41

Calculate the difficulty of Bitcoin network Which variable among the components of the block header is computed (or rather obtained) to achieve the difficulty posed by the bitcoin network? Nonce or Previous block hash? https://ift.tt/2NrZWXs

Decrypting wallet works using command line, but does not work throught the Qt Gui I have upgraded to Bitcoin core version 0.16.2 and when I try to access my wallet using the passphrase, it gives an error in the Qt gui saying incorrect passphrase, but it works using the rpc command bc walletpassphrase "...". I'm not sure if this is a bug, or just an issue on my laptop. I am running on Mac OS 10.13.6. https://ift.tt/2Nvbc5c

New NebuTech BTMiner 9.0 for Bytom (BTM) With Improved Hashrate One more update for the NebuTech BTMiner Nvidia GPU miner to version 9.0 for mining Bytom (BTM) that brings significant performance improvement by increasing the hashrate provided by the miner with about 30% over the previous version 8.0 released earlier this month. This is a very significant performance improvement and it comes along with additional stability improvements to the miner, so if you are mining Bytom (BTM) with your NVidia GPU mining rigs you must definitely update ot the latest version. We remind you that the NebuTech BTMiner is a closed source Bytom (BTM) GPU miner for Nvidia CUDA that is available for both Windows and Linux operating systems and it has a 3% developer fee built-in. – To download the latest NebuTech BTMiner Bytom Nvidia GPU Miner v9.0 for Windows/Linux… https://ift.tt/2opehZX

Can't generate same addresses as bitcoincore using xprv from bitcoin-core First of all all addresses below are for testing purposes so I don't care about private keys. So dumped wallet created by Bitcoin-qt v0.16.2: extended private masterkey: xprv9s21ZrQH143K3mYiBBH7MwWV9VTkeB5q5sxEFGgvLbLqRZ3xPVAKvwyxSLVtTcL2tz665vdZnHLrMQPr6MWGKdDHYoncZmUNiUgtShGCmZE From what I can understand from the rest of the dump the first receive address is: addr=3DhmoRSx2bjxyJm7A1Crs3bCPnVcEx51fE hdkeypath=m/0'/0'/0' Now I am trying to generate same addess using bitcoinjs-lib but haven't had any success so far with it. import { HDNode } from "bitcoinjs-lib"; const key = HDNode.fromBase58( "xprv9s21ZrQH143K3mYiBBH7MwWV9VTkeB5q5sxEFGgvLbLqRZ3xPVAKvwyxSLVtTcL2tz665vdZnHLrMQPr6MWGKdDHYoncZmUNiUgtShGCmZE" ); console.log(key.derivePath("m/0'/0'/0'").getAddress()); // prints 1NoQERVA18v5WcFUbgvz22tDGigmAkqy4U Now I get confused becuase I use

Is it possible to hide the sender or receiver of transactions by &quot;zk-SNARK&quot; or &quot;Bulletproofs&quot;? To support the user privacy , is it possible to hide the sender address or receiver address of transactions by "zk-SNARK" or "Bulletproofs" ? Or we’ll be able only to hide the value that is mapped to an address ? Assume the following mapping: mapping (address => bytes32) userData; Normally, using non-interactive zero-knowledge proofs (like "zk-SNARK" or "Bulletproofs"), we are able to hide the value that is mapped to an address (i.e. userData) as follows: mapping (address => bytes32) userDataHash; And then by zero-knowledge proofs, we can prove that if userDataHash meets a condition? For example, prove that an encrypted number is in a given range, without revealing anything else about the number. However, assume that instead of Data, we want to hide sender of transaction (i.e. address). We want to

How to verify if money was sent My friend was supposed to send me $800 last night. He says he sent itAs that make up ever see this as he sucked bitcoin but it doesn’t show where it was sent. And my account which is new and doesn’t show anything in it. It’s just someone I can speak with to verify whether this occurred or not? https://ift.tt/2wwiwWS

Why most of pubkeys in the first batch of blocks in blk00000.dat are different For example: the pubkey in the first 3 coinbase's output are 04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f 0496b538e853519c726a2c91e61ec11600ae1390813a627c66fb8be7947be63c52da7589379515d4e0a604f8141781e62294721166bf621e73a82cbf2342c858ee 047211a824f55b505228e4c3d5194c1fcfaa15a456abdf37f9b9d97a4040afc073dee6c89064984f03385237d92167c13e236446b417ab79a0fcae412ae3316b77 Actually, I checked the first 6k transaction, most of the pubKey in the pay-to-pubkey script is different, less than 10 pubKeys have duplications. Is that means satoshi use multi miner jobs to mine the block at the beginning or anything I misunderstood? The reference link is here. block0: https://www.blockchain.com/btc/tx/4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b block1: https://www.blockchain.com/btc/tx/0e3e2357e806b6cdb1

How is the amount of proof-of-work invested in a chain calculated? The bitcoin whitepaper (page 3) states The majority decision is represented by the longest chain, which has the greatest proof-of-work effort invested in it. I could not find how exactly this difficulty is calculated. Is it the sum of prefix zeros of the nonces of each block? I found this answer but it is too short for me to understand. https://ift.tt/2LDnaYK

Is there a decentralized zk-SNARK (zero-knowledge Succinct Non-Interactive ARgument of Knowledge)? Normally, in zk-SNARK, we need to generate two public keys: one for prover and one for verifier. However, the input parameter of this generator algorithm must be secret, meaning that it must be hidden for both prover and verifier. And because of this, the process of those public generation is done by a trusted third party . Since using a trusted third party is not desirable for decentralized blockchain, I am looking for a decentralized approach of those public key generation. Is there ? or it's impossible to have a decentralized zk-SNARK ? P.S. More information about zk-SNARK is found here: https://media.consensys.net/introduction-to-zksnarks-with-examples-3283b554fc3b https://ift.tt/2MF8yOd

Thailand SEC Updates ICO Licensing Operation, a Committee of Experts to be Formed The Thai Securities and Exchange Commission (SEC) has disclosed the number of applications it has received from various firms requesting to operate ICO portals within the country. https://ift.tt/2BROG56

Green Markets | "BTC is Cool" -U.S. Fed Reserve | India Civil Blockchain | Mt Gox | NK Mining | For Reference: 1. DASH - https://ift.tt/2wmAjAL 2. BTC Fed Reserve - https://ift.tt/2LARcfP 3. India - https://ift.tt/2LxiJ1N 4.Mt. Gox - https://ift.tt/2PKRKmE 5. North Korea- https://ift.tt/2Nov5uB 😀 Thank You For Watching! :D 💥Bookmark Our New Forums & Join The Community Discussion! ►►Crypt0 Message Boards - https://goo.gl/YuBrTn 🚩Remember to subscribe and hit the bell "🔔" icon to get notifications as soon as I upload a new video or start a live stream! 🎩►Get Access To Our Exclusive Real-Time Telegram Chat Group: https://goo.gl/vpX5sW ___________________________ Crypto Donations Are Really Appreciated! ►💓Donate Ether and Ethereum-Based (ERC-20) Tokens: 0x1466032B4F0F13910DA35B16371807428CB40714 ►💓Donate Bitcoin: 3JKQycXHdD5yqSRTf5VabM28Ff9AfXYcJD ►💓Donate Using Paypal: https://goo.gl/7m1X4Z ___________________________ 🚩🚩MUST HAVE ►The Ledger Nano S Crypt

New Merit (MRT) Nvidia GPU Miner – zjazz CUDA Miner Something interesting for everyone that has taken interest in Merit (MRT) and is mining the crypto currency, a new third parity Nvidia GPU miner for the Cuckoo cycle algorithm used by the project is now available. If you still have not checked Merit, but are interested read more about it in our post and you can request an invite since we currently have a few more extra available to give out. Since invites are limited and hard to acquire, please apply only if you really are interested in trying out Merit and do not waste them without a reason. The just released zjazz CUDA miner is intended to provide alternative to the official miner, giving more flexibility and stability as well as performance in some cases. The new miner comes with multiple options to reduce the CPU load for GPU mining rigs with slower CPUs (Merit mining is still CPU heavy) or to maximize performance on mining machines with more powerful processors increasing the

Aidos Kuneen Unveils Most Crypto-Friendly Banking Network As the options to meet cryptocurrency exchanges’ banking needs are shrinking, Aidos Kuneen is offering crypto users the opportunity to park their wealth in a trustless network with easy access to fiat via banks. https://ift.tt/2N1MmNC

Sparkdex: Hong Kong’s First Decentralised Cryptocurrency Exchange Addresses Current Security Concerns Sparkdex Hong Kong’s first decentralized cryptocurrency exchange to launch 30th August, 2018. https://ift.tt/2wn8KqU

Ether Kingdoms Concludes Beta Test, Announces Upcoming Developments The world’s first free-to-play cryptocurrency game with Proof-of-Stake mining, Ether Kingdoms, has announced the successful completion of its beta testing as it positions itself as the premiere collectible gaming experience on the blockchain. The platform has now added over 25 artifacts to its game contents, support for 120+ levels, ability to buy artifact loot boxes, exciting quest chains, and integrated support CryptoKitties ERC721 tokens. https://ift.tt/2MXZ2VB

Jubiter Lets Anyone with a Credit Card Easily Step Into the World of Crypto Jubiter is proud to announce the launch of a free and secure cryptocurrency exchange. https://ift.tt/2LzTrjw

error when checking bitcoin balance with bitcore-lib I get 525 error when running node js with bitcore here is my code var bitcore =require('bitcore-lib'); var Insight =require('bitcore-explorers').Insight; var insight = new Insight("testnet"); insight.getUnspentUtxos("mgZsaffMAow9TR21BQHY9HfTdbPdJFkww2", function(error, utxos) { if (error) { res.json({ error:error }) } else { } }) and here is the response {"error":{"statusCode":525,"body":"<!DOCTYPE html>\n<!--[if lt IE 7]> <html class=\"no-js ie6 oldie\" lang=\"en-US\"> <![endif]-->\n<!--[if IE 7]> <html class=\"no-js ie7 oldie\" lang=\"en-US\"> <![endif]-->\n<!--[if IE 8]> <html class=\"no-js ie8 oldie\" lang=\"en-US\"> <![endif]-->\n<!--[if gt IE 8]><!--> <html class=\&q

Is there a decentralized zk-SNARK? Normally, in zk-SNARK, we need to generate two public keys: one for prover and one for verifier. However, the input parameter of this generator algorithm must be secret, meaning that it must be hidden for both prover and verifier. And because of this, the process of those public generation is done by a trusted third party . Since using a trusted third party is not desirable for decentralized blockchain, I am looking for a decentralized approach of those public key generation. Is there ? or it's impossible to have a decentralized zk-SNARK ? P.S. More information about zk-SNARK is found here: https://media.consensys.net/introduction-to-zksnarks-with-examples-3283b554fc3b https://ift.tt/2BUI3PB

zk-SNARK use cases in blockchain (except payment)? Is there other examples of using zk-SNARK for supporting "private transactions" except Zerocoin or Zchach ? (For example, is it possible to use zk-SNARK for health data ? or any other use cases in which the data privacy is important ?) The only example I found was related to the "payment use case" such as Zerocash . Does it mean zk-SNARK use case in blockchain is limited to use it only in the payment use case ? Is there other research papers on using zk-SNARK for supporting data privacy and private (confidential) transactions in the blockchain except payment use case ? https://ift.tt/2NwkLAM

Bitcoin transaction fee calculate before send This already summaries the issue I'm currently trying to figure out to calculate the transaction fee to prevent negative balance. (testnet) I tried using createrawtransaction answered . When I tried to send all balance to an address, the txid was created successfully using createrawtransaction but when I ran the fundrawtranaction on that txid it showed error code: -4 error message: Insufficient funds The goal is to calculate transaction fee before hand to check either sufficient balance is available of an account using sendfrom https://ift.tt/2NouBVq

How can I get whole info about tranasaction whose outputs are spent? I use RPC method getrawtransaction to get whole info about transaction. But if I rigth understood It works only for transaction whose contains at least one unspent output. How can I get whole info about transaction like getrawtransaction provide for transaction whose all outputs are spent or How does blockcypher implement this? For example this tx: https://live.blockcypher.com/btc-testnet/tx/501553f8a27cfb8f661e9c977b923908642c1817ef6037eb104da8dfb892890a/ https://ift.tt/2LvsSfb

Error when sending transaction: &quot;Signature is found in scriptCode&quot; I'm trying to send transaction with scriptSig: OP_PUSHDATA<Sig> OP_PUSHDATA<Data1> OP_PUSHDATA<Data2> OP_PUSHDATA<Data3> OP_PUSHDATA<RedeemScript> But I get error: mandatory-script-verify-flag-failed (Signature is found in scriptCode) Why am I getting this error? What is wrong? Raw transaction: 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

Statement: for an attacker to change history, they must solve computational puzzles at a faster rate than the rest of the participants combined I'm new to cryptocurrency and blockchain. I just started reading the textbook Bitcoin and Cryptocurrency Technologies by Narayananm, Bonneau, Felten, Miller and Goldfeder. The statement in the title is given in the introduction to the book (page 17 in the pre-publication draft for anyone interested) I'm assuming it is accurate and that it is connected to the architecture of the bitcoin blockchain. However, I don't quite understand why this is the case. Is it because in order to change history you need to change the entire chain up to the block you want to change? And why do you need do be faster than all others combined? Any explanation would be greatly appreciated! Edit: Later, on page 33: as long as we store the hash pointer at the head of the list in a place where the adversary cannot change it, the adversary will be unabl

Unable to get balance with bitcore lib Using latest version of bitcore lib , want to check balance for making tx but once I include var explorers =require('bitcore-explorers'); after var bitcore =require('bitcore-lib'); Error: More than one instance of bitcore-lib found. Please make sure to require bitcore-lib and check that submodules do not also include their own bitcore-lib dependency. at Object.bitcore.versionGuard (/home/ubuntu/node_modules/bitcore-lib/index.js:12:11) at Object.<anonymous> (/home/ubuntu/node_modules/bitcore-lib/index.js:15:9) at Module._compile (module.js:652:30) at Object.Module._extensions..js (module.js:663:10) at Module.load (module.js:565:32) at tryModuleLoad (module.js:505:12) at Function.Module._load (module.js:497:3) at Module.require (module.js:596:17) at require (internal/module.js:11:18) at Object.<anonymous> (/home/ubuntu/controllers/bitcoinController.js:8:14) at Module._compile (module.js:652:30) at Object.Module._ext

Web wallet providers business logic How does web wallet providers secure the wallets stored in their servers from being misused by their own developers? https://ift.tt/2LC8edG

Where does the mining reward in regtest go? After using the bitcoind -regtest generate 1 command, where does the mining reward go? I tried list accounts and check balance for account "", but the balance always showed 0.000000. https://ift.tt/2PcGy13

is it available to pay for my multiple inputs at one time? I have a Bitcoin wallet and there is a large number of spendable addresses. if i make a transaction and there is a multiple inputs which is belonged to me(my wallet), is it possible to pay a fee by the single address? (Is it possible to pay fees for my other bitcoin addresses?) https://ift.tt/2BThQky

relationship between inputs in single transaction I'm a student to learn about bitcoin. i saw a lot of transactions from Blockchain.info for study, and some of transactions can not be understood. why address '367f4YW...' pay to itself? is it available to guess a relationship between '367f4YW...' and '15ozxv...'? https://ift.tt/2MUT5c1

What do you thing about nice hash miner Download nice hash miner here http://www.mediafire.com/folder/onr6csn7m65qz/nice_hash_miner and https://github.com/nicehash/NiceHashMinerLegacy donate at 1MWZkA9nZ3jyWPoFAcpwHDVSR6yNMmcimp if you like it Hi I have a bit of doggie dog titus and omertha gomposure can you do anything with a setting wifi with a library filter I can't mine on this computer it is Windows 7 64 Bits I need some MONEY to eat they took away my foodstamps over the ABWAD thing I am getting tired of eating out of a trash can or help me out here https://www.blockchain.com/btc/payment_request?address=1MWZkA9nZ3jyWPoFAcpwHDVSR6yNMmcimp&message=mude+a+vida+de+uma+pessoa&amount=1 https://ift.tt/2MWn0R5

Merit, a New Under the Radar Digital Currency To Check Out Once in a while we stumble on some really interesting under the radar projects that are interesting as an idea and show great potential for growth, often by coincidence or getting advice to check them out by friends or readers. Here comes another one of these called Merit that has been launched a few months ago and has been growing steadily and mostly under the radar, because it is an invite only network where you actually “mine” the invites as well as the Merit (MRT) coins. Merit uses a controlled-growth model, so that there will not be a quick hype, but instead slower, but safer growth of the whole ecosystem with changes and improvements along the way making things better and easier. One of the good things about the project is that you actually can mine coins, we like mining crypto coins and we are sure you do so as well, but there are also other ways to earn coins like the Growth Rewards that are a kind of a lottery syste