Trending questions in Blockchain

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Python Script to pull data from Blockchain JSON

Try this: print r.json()['address'],' has ', r.json()['n_tx'], 'tr ...READ MORE

Sep 14, 2018 in Blockchain by digger
 • 26,740 points • 3,520 views
0 votes
1 answer

Go build fail, fatal error: rocksdb/c.h

I followed here and it is done. https://github.com/openblockchain/obc-peer/issues/885 Configure ...READ MORE

Sep 17, 2018 in Blockchain by slayer
 • 29,370 points • 3,383 views
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1 answer

TypeError: XMLHttpRequest is not a function when using web3 on meteor server side

I had the same problem. Instead ethereum:web3 Meteor package ...READ MORE

Oct 10, 2018 in Blockchain by Omkar
 • 69,180 points • 2,366 views
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1 answer

pubToAddress method from ethereumjs-util throws AssertionError: false == true

This code works fine: var keythereum = require('keythereum'); var ...READ MORE

Oct 8, 2018 in Blockchain by Omkar
 • 69,180 points • 2,450 views
0 votes
1 answer

truffle migrate Error

testrpc Check your truffle.js config port and ip ...READ MORE

Oct 8, 2018 in Blockchain by Omkar
 • 69,180 points • 2,437 views
0 votes
1 answer

Not able send ether to my smart contract's address

It turns out that you need to create ...READ MORE

Sep 25, 2018 in Blockchain by slayer
 • 29,370 points • 2,995 views
0 votes
1 answer

What is the difference between creating a new solidity contract with and without the `new` keyword?

You cannot omit new keyword for creating ...READ MORE

Oct 8, 2018 in Blockchain by Omkar
 • 69,180 points • 2,429 views
0 votes
1 answer

Cant extract hyperledger artifacts

Simplify the PATH first. In a CMD, type: set PATH=C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\ set ...READ MORE

Oct 29, 2018 in Blockchain by Omkar
 • 69,180 points • 1,503 views
0 votes
1 answer

Python request module for bitcoin json rpc

This should work: #!/usr/bin/env python import getpass import json import requests ...READ MORE

Aug 28, 2018 in Blockchain by digger
 • 26,740 points • 4,168 views
0 votes
1 answer

Hyperledger Composer Incompatible versions error

The versions are same. Maybe its a ...READ MORE

Oct 24, 2018 in Blockchain by Omkar
 • 69,180 points • 1,697 views
0 votes
1 answer

Go ethereum: Gradle sync error

Try the below code : maven { ...READ MORE

Oct 24, 2018 in Blockchain by Omkar
 • 69,180 points • 1,697 views
0 votes
1 answer

What happens to Ether in a smart contract after selfdestruct?

selfdestruct takes one argument an address and then sends all ...READ MORE

Oct 3, 2018 in Blockchain by digger
 • 26,740 points • 2,603 views
0 votes
2 answers

Warning: Using contract member “balance” inherited from the address type is deprecated. Solidity

Alternatively you could assign this to a local variable ...READ MORE

Oct 3, 2018 in Blockchain by Rustom
 • 2,715 views
0 votes
1 answer

Cant decode hex sting into decimal. Getting TypeError.

On the line where it shows error, ...READ MORE

Jul 6, 2018 in Blockchain by slayer
 • 29,370 points • 6,426 views
0 votes
1 answer

Solidity invalid opcode error

In the for loop, your indexing going ...READ MORE

Aug 16, 2018 in Blockchain by slayer
 • 29,370 points • 4,644 views
0 votes
1 answer

jsonRPCClient Error with php variables

All you have to do is change ...READ MORE

Sep 12, 2018 in Blockchain by digger
 • 26,740 points • 3,456 views
0 votes
1 answer

Solidity mocha : address is not a contract error

Try the following: // Initialize contract variable with ...READ MORE

Oct 1, 2018 in Blockchain by digger
 • 26,740 points • 2,630 views
+1 vote
1 answer

How to create participant and there identities via rest API in Hyperledger Composer?

If you have already imported an Identity ...READ MORE

Aug 10, 2018 in Blockchain by Perry
 • 17,100 points • 4,810 views
0 votes
1 answer

sellprice and buyprice fixing in smart contract.

It is due to the fact you ...READ MORE

Oct 17, 2018 in Blockchain by Christine
 • 15,750 points • 1,916 views
0 votes
1 answer

Intl.NumberFormat() does not show the Bitcoin Ƀ Symbol

According to bitcoin.it (https://en.bitcoin.it/wiki/Bitcoin_symbol), The ISO 4217 currency code for ...READ MORE

Aug 27, 2018 in Blockchain by slayer
 • 29,370 points • 4,104 views
0 votes
1 answer

Solidity how to solve “Error Encoding arguments ” error while using create button?

When you pass multiple arguments, you need ...READ MORE

Jul 30, 2018 in Blockchain by slayer
 • 29,370 points • 5,328 views
0 votes
1 answer

BitcoinJ generate address from private key

Convert string private key into bytes[]: ECKey key = ...READ MORE

Sep 4, 2018 in Blockchain by slayer
 • 29,370 points • 3,735 views
0 votes
1 answer

How can I create an online wallet without any 3rd party API on my PHP server?

With any approach, you need a bitcoin ...READ MORE

Aug 30, 2018 in Blockchain by Perry
 • 17,100 points • 3,968 views
+1 vote
1 answer

Solidity: Sending ERC20 Tokens

You can try this code transferTokensTo: function(contract, address_from, ...READ MORE

Sep 26, 2018 in Blockchain by slayer
 • 29,370 points • 2,730 views
0 votes
2 answers

Creating a private/public key with 64 characters that are already known using bitcoinjs

//public-key var address = eckey.getBitcoinAddress().toString(); var privateKeyBytesCompressed = privateKeyBytes.slice(0); ...READ MORE

Sep 10, 2018 in Blockchain by Misty
 • 3,414 views
0 votes
1 answer

Mining in private net: Balance not increasing

Use this command to start miner: miner.start() To stop ...READ MORE

Oct 24, 2018 in Blockchain by Omkar
 • 69,180 points • 1,541 views
0 votes
1 answer

Solidity: How can I return a list of user-defined function?

You can do it with something like ...READ MORE

Sep 26, 2018 in Blockchain by digger
 • 26,740 points • 2,733 views
0 votes
1 answer

Bitcoinj send payment from a wallet

The problem actually was with the input ...READ MORE

Sep 6, 2018 in Blockchain by slayer
 • 29,370 points • 3,580 views
0 votes
1 answer

How can I inject and use this javascript library (web3) with JavascriptCore

The web3.js library has dependencies on bignumber.js and crypto-js.js (See dependencies here). You will ...READ MORE

Oct 8, 2018 in Blockchain by Omkar
 • 69,180 points • 2,194 views
0 votes
1 answer

How to convert byte array to hex string?

You are missing the padding in the ...READ MORE

Aug 17, 2018 in Blockchain by slayer
 • 29,370 points • 4,436 views
0 votes
1 answer

Sending hash in function parameter

I am developing a smart contract using ...READ MORE

Oct 8, 2018 in Blockchain by Omkar
 • 69,180 points • 2,184 views
0 votes
1 answer

How to generate Bitcoin address in Ruby?

In your generate_address_from_public_key_hash method, the checksum should be over ...READ MORE

Aug 22, 2018 in Blockchain by slayer
 • 29,370 points • 4,197 views
0 votes
1 answer

Poloniex C# API - get trades

Outputting the Trade will just show you ...READ MORE

Sep 25, 2018 in Blockchain by digger
 • 26,740 points • 2,705 views
0 votes
1 answer

How to use Coinbase send_money API?

<?php require_once(dirname(__FILE__) . '/../lib/Coinbase.php'); // Create an application at ...READ MORE

Sep 12, 2018 in Blockchain by slayer
 • 29,370 points • 3,244 views
0 votes
1 answer

Go- Chaincode function to display struct values

Try this func (t *SimpleChaincode) setDetails(stub shim.ChaincodeStubInterface, args ...READ MORE

Sep 19, 2018 in Blockchain by digger
 • 26,740 points • 2,928 views
+4 votes
4 answers

How does the blockchain verification process work?

First of all, when someone creates a ...READ MORE

Mar 26, 2018 in Blockchain by Perry
 • 17,100 points • 5,970 views
0 votes
1 answer

Where is the geth.exe in the Ethereum mist?

In Windows, you will find geth.exe in ...READ MORE

Oct 10, 2018 in Blockchain by Omkar
 • 69,180 points • 1,991 views
0 votes
1 answer

Handling UI when a trasaction is in pending (MetaMask)

You need to use the state of ...READ MORE

Oct 3, 2018 in Blockchain by digger
 • 26,740 points • 2,289 views
0 votes
1 answer

How to generate litecoin using pycoin?

In the secret_exponent_to_wif function def secret_exponent_to_wif(se, compressed): ...READ MORE

Aug 29, 2018 in Blockchain by digger
 • 26,740 points • 3,792 views
0 votes
1 answer

Ethereum generating genesis Python Syntax

print in python3 is a method not a ...READ MORE

Oct 10, 2018 in Blockchain by Omkar
 • 69,180 points • 1,976 views
0 votes
1 answer

How to deploy hyperledger fabric in production level?

Once you set up the Fabric, bring ...READ MORE

Aug 2, 2018 in Blockchain by aryya
 • 7,460 points • 4,965 views
0 votes
1 answer

Ethereum serpent version conflict error.

Upgrade to the lastest version of ethereum-serpent ...READ MORE

Oct 24, 2018 in Blockchain by Omkar
 • 69,180 points • 1,333 views
0 votes
1 answer

Web is not injected by metamask

You need to do import the Web3 ...READ MORE

Oct 3, 2018 in Blockchain by slayer
 • 29,370 points • 2,236 views
+1 vote
3 answers

HTML Bitcoin address parsing using Beautiful soup

Regex is not meant for parsing. As ...READ MORE

Sep 5, 2018 in Blockchain by Lewis
 • 3,322 views
0 votes
1 answer

Nethereum C# Unit Test GetTransactionCount

You have already made the test async ...READ MORE

Sep 26, 2018 in Blockchain by slayer
 • 29,370 points • 2,533 views
0 votes
1 answer

Bitcoinjs-lib getAddress not a function error

You need to pass network parameter to ...READ MORE

Aug 27, 2018 in Blockchain by slayer
 • 29,370 points • 3,824 views
0 votes
1 answer

How to call function in one contract from another contract in private blockchain?

Please check whether you have byzantiumBlock: 0 in your ...READ MORE

Oct 1, 2018 in Blockchain by digger
 • 26,740 points • 2,303 views
0 votes
1 answer

What are the differences between chain and state database in hyperledger fabric?

There are two place which "store" data ...READ MORE

Jul 11, 2018 in Blockchain by Shashank
 • 10,400 points • 5,837 views
0 votes
1 answer

Solidity different token price

Yes you can do this by modifying ...READ MORE

Oct 8, 2018 in Blockchain by Omkar
 • 69,180 points • 1,996 views
0 votes
1 answer

Is there a way to get a trade history report from the Bitfinex API?

You can still fetch your private trades ...READ MORE

Aug 30, 2018 in Blockchain by Perry
 • 17,100 points • 3,659 views
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