Most voted questions in Blockchain

0 votes
1 answer

Cant connect Jsonrpc to bitcoin.

I tried the following code and it ...READ MORE

Aug 20, 2018 in Blockchain by digger
 • 26,740 points • 794 views
0 votes
2 answers

How to check if bitcoin address is valid?

For Java, have a look at the ...READ MORE

Aug 20, 2018 in Blockchain by Omkar
 • 69,210 points • 2,963 views
0 votes
1 answer

Bitcoin transaction “"You must provide a recipient address" ” error.

You need an account with BlockChain to ...READ MORE

Aug 20, 2018 in Blockchain by digger
 • 26,740 points • 498 views
0 votes
1 answer

Bitcoin Wallet address validation using Json and bitcoin/blockexplorer.

The URL isn't returning JSON. So instead ...READ MORE

Aug 20, 2018 in Blockchain by slayer
 • 29,350 points • 2,030 views
0 votes
1 answer

Bitcoin pool mining using stratum

JSON string shouldn't have any spaces. So ...READ MORE

Aug 20, 2018 in Blockchain by digger
 • 26,740 points • 1,019 views
0 votes
1 answer

Terminating transaction-cli

You can use the -f, -finish <script> which executes ...READ MORE

Aug 20, 2018 in Blockchain by slayer
 • 29,350 points • 316 views
0 votes
1 answer

Sending keep-alive packet, bitcoin.

You can use Websocket Eventmachine Client (https://github.com/imanel/websocket-eventmachine-client) gem to ...READ MORE

Aug 20, 2018 in Blockchain by digger
 • 26,740 points • 601 views
0 votes
1 answer

How to resolve blockchain DNS using Python Requests?

You could use one of their publicly ...READ MORE

Aug 20, 2018 in Blockchain by Omkar
 • 69,210 points • 1,639 views
0 votes
1 answer

Who decided the rules for Cryptocurrency in the first place?

A single miner can tamper with a ...READ MORE

Aug 22, 2018 in Blockchain by Christine
 • 15,790 points • 396 views
0 votes
3 answers

Hyperledger-fabric not working with docker swarm

The issue is that the chaincode container ...READ MORE

Aug 21, 2018 in Blockchain by Perry
 • 17,100 points • 2,317 views
0 votes
1 answer

How to parse Json data from remote server?

Yes, you can do it use the ...READ MORE

Aug 17, 2018 in Blockchain by digger
 • 26,740 points • 655 views
0 votes
1 answer

How to install Magento Bitcoin Currency extension on linux box?

Follow these steps to install it: Copy files ...READ MORE

Aug 17, 2018 in Blockchain by slayer
 • 29,350 points • 833 views
0 votes
1 answer

OpenSSL i2o_ECPublicKey not working

When your right something in the buffer, ...READ MORE

Aug 17, 2018 in Blockchain by digger
 • 26,740 points • 916 views
0 votes
2 answers

How do I interact with a smart contract on a private network through web3.js

I found a blog that explains how ...READ MORE

Aug 20, 2018 in Blockchain by slayer
 • 29,350 points • 3,677 views
0 votes
1 answer

Implementing Giveaways in Blockchain

I have found a similar question. The ...READ MORE

Aug 17, 2018 in Blockchain by digger
 • 26,740 points • 444 views
0 votes
1 answer

How to control bitcoind from another machine?

In your bitcoin.config file replace rpcallowip with ...READ MORE

Aug 17, 2018 in Blockchain by digger
 • 26,740 points • 674 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
 • 29,350 points • 2,715 views
0 votes
1 answer

How to see bitcoin transaction info?

You can view foreign transactions using bitcoind. Set txindex=1 in ...READ MORE

Aug 17, 2018 in Blockchain by digger
 • 26,740 points • 1,776 views
0 votes
1 answer

How to use Blockchain receive API without exchange rate?

Your code contains the amount in USD ...READ MORE

Aug 21, 2018 in Blockchain by Perry
 • 17,100 points • 595 views
0 votes
1 answer

How to add Bitcoin as currency for my website?

You cannot use BTC as the currency ...READ MORE

Aug 17, 2018 in Blockchain by slayer
 • 29,350 points • 831 views
0 votes
1 answer

How to check payment in Blockchain.info wallet?

The above error is probably occurring due ...READ MORE

Aug 21, 2018 in Blockchain by Perry
 • 17,100 points • 910 views
0 votes
1 answer

Blockchain peer not able to min block in Azure.

After trying out various ideas, making sure ...READ MORE

Aug 21, 2018 in Blockchain by Perry
 • 17,100 points • 366 views
0 votes
1 answer

How to create Quorum rawTransaction?

Unfortunately this capability is not currently supported ...READ MORE

Aug 17, 2018 in Blockchain by Shashank
 • 10,400 points • 579 views
0 votes
1 answer

Where is query displayed in Hyperledger?

Composer configures the named queries for a ...READ MORE

Aug 17, 2018 in Blockchain by Shashank
 • 10,400 points • 598 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
 • 29,350 points • 2,909 views
0 votes
1 answer

Solidity difference array with and without new keyword.

Creating arrays with variable length in memory ...READ MORE

Aug 16, 2018 in Blockchain by digger
 • 26,740 points • 1,434 views
0 votes
1 answer

How to get return value from solidity contract?

Once you call a constant function, you ...READ MORE

Aug 16, 2018 in Blockchain by slayer
 • 29,350 points • 4,760 views
0 votes
1 answer

Function not working from class

Try this code:  // Add new block ...READ MORE

Aug 16, 2018 in Blockchain by digger
 • 26,740 points • 431 views
0 votes
1 answer

How do I change default service names in Corda Demobench?

Each Corda node individually advertises the services ...READ MORE

Aug 14, 2018 in Blockchain by Perry
 • 17,100 points • 556 views
0 votes
1 answer

Planning to deploy IBM bluemix fabric images on Docker, do I need Amazon ECS or EC2 instances?

Bluemix has an excellent documentation which provides ...READ MORE

Aug 14, 2018 in Blockchain by Perry
 • 17,100 points • 492 views
0 votes
1 answer

What files are supported by BigchainDB?

BigchainDB supports .json file format. It can ...READ MORE

Feb 26, 2019 in Blockchain by anonymous
 • 430 views
0 votes
2 answers

Python syntax error because of version conflicts.

As mentioned in the reply to my ...READ MORE

Aug 13, 2018 in Blockchain by Omkar
 • 69,210 points • 952 views
0 votes
1 answer

How to get return value of external function?

You can do this. I have shared ...READ MORE

Aug 13, 2018 in Blockchain by digger
 • 26,740 points • 1,649 views
0 votes
1 answer

How to call smart contract methods from transactions?

You can do this using a wrapper. ...READ MORE

Aug 13, 2018 in Blockchain by slayer
 • 29,350 points • 791 views
0 votes
1 answer

Encoding integers in solidity

There are different ways to do this ...READ MORE

Aug 13, 2018 in Blockchain by digger
 • 26,740 points • 744 views
0 votes
1 answer

How to access member functions of smart contract using web3?

I have implemented a similar feature and ...READ MORE

Aug 13, 2018 in Blockchain by slayer
 • 29,350 points • 1,398 views
0 votes
1 answer

Why does Blockchain comes under Distributed Ledger Technology instead of being merely a replicated database?

1. Data in a database is generally subject ...READ MORE

Aug 10, 2018 in Blockchain by Christine
 • 15,790 points • 521 views
0 votes
1 answer

How do I convert to Crystal ruby's multiple assignments of Array

When decomposing an Array into a multiple ...READ MORE

Aug 10, 2018 in Blockchain by Perry
 • 17,100 points • 573 views
0 votes
1 answer

How to prevent the smart contract from being modified and deployed in Hyperledger network?

Smart contracts can be definitive if they ...READ MORE

Aug 10, 2018 in Blockchain by Perry
 • 17,100 points • 481 views
0 votes
1 answer

How do transactions create a new block in Blockchain?

Bitcoin puts a cap of 2,400 transactions ...READ MORE

Aug 10, 2018 in Blockchain by Christine
 • 15,790 points • 1,512 views
0 votes
1 answer

Why do the resultant hash after mining has a leading no. of zeroes in Blockchain verification?

This is chosen by the DIFFICULTY EQUATION. In ...READ MORE

Aug 10, 2018 in Blockchain by Christine
 • 15,790 points • 3,271 views
0 votes
1 answer

How to explore and analyze the data inside a Hyperledger Blockchain network?

In Hyperledger Composer, you have all the ...READ MORE

Aug 10, 2018 in Blockchain by Christine
 • 15,790 points • 1,022 views
0 votes
1 answer

How to add https security for Node js?

You need to add the key and cert to the createServer function. const options ...READ MORE

Aug 10, 2018 in Blockchain by digger
 • 26,740 points • 525 views
0 votes
1 answer

How to create light wallet in Web3J?

You can use this method to create ...READ MORE

Aug 10, 2018 in Blockchain by slayer
 • 29,350 points • 1,798 views
0 votes
1 answer

Fatal error while installing web3 node.

Try to add git config by executing ...READ MORE

Aug 10, 2018 in Blockchain by digger
 • 26,740 points • 1,359 views
0 votes
1 answer

Problem with installing testrpc using python-pip.

You are facing this error because you ...READ MORE

Aug 10, 2018 in Blockchain by slayer
 • 29,350 points • 815 views
0 votes
1 answer

What does _ mean in solidity language?

The _ symbol is a place holder. ...READ MORE

Aug 10, 2018 in Blockchain by digger
 • 26,740 points • 2,367 views
0 votes
1 answer

How to use third party contract to send ERC token?

You can do it by using a ...READ MORE

Aug 10, 2018 in Blockchain by slayer
 • 29,350 points • 736 views
0 votes
1 answer

Truffle Error: Migrations contract constructor expected

You are not using constructor() public { ...READ MORE

Aug 10, 2018 in Blockchain by digger
 • 26,740 points • 1,357 views
0 votes
1 answer

Fabric-node-sdk 1.2 with Fabric 1.1

The line grpc-max-send-message-length: 15 is used to load ...READ MORE

Aug 10, 2018 in Blockchain by slayer
 • 29,350 points • 673 views
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