Trending questions in Blockchain

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How to check history of blockchain.info wallet?

In the link you mentioned(https://blockchain.info/q), there are ...READ MORE

Jul 23, 2018 in Blockchain by slayer
 • 29,350 points • 1,489 views
+1 vote
1 answer

Is it possible to exchange the token for other tokens we create in an Ethereum Smart Contract?

Yes you can do that through something ...READ MORE

Aug 10, 2018 in Blockchain by Perry
 • 17,100 points • 656 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

Can I make my smart contract private in Quorum?

Yes, it is possible. You can look ...READ MORE

Jul 23, 2018 in Blockchain by slayer
 • 29,350 points • 1,452 views
0 votes
1 answer

IPFS transaction cost as a decentralized service

IPFS itself does not have transaction cost, ...READ MORE

Aug 3, 2018 in Blockchain by Perry
 • 17,100 points • 976 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
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 • 493 views
0 votes
1 answer

Hyperledger Sawtooth installation JAVA_HOME: path not found

/etc/environment is a bash script, so change the ...READ MORE

Aug 10, 2018 in Blockchain by digger
 • 26,740 points • 670 views
0 votes
1 answer

Solidity Error: Member "equal" is not available in type(library Assert) outside of storage

You can get error because solidity does ...READ MORE

Aug 9, 2018 in Blockchain by slayer
 • 29,350 points • 699 views
0 votes
1 answer

How to solve “ERROR: manifest for hyperledger/fabric-couchdb:latest not found” error?

This seems to be a problem with ...READ MORE

Jul 31, 2018 in Blockchain by digger
 • 26,740 points • 1,067 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 • 1,924 views
0 votes
1 answer

Error in Chaincodes not getting picked up by ./startFabric.sh

After changing chaincode in fabric-samples/chaincode/fabcar/go/fabcar.go (this is ...READ MORE

Jul 31, 2018 in Blockchain by Shashank
 • 10,400 points • 1,054 views
0 votes
1 answer

How to generate events in Hyperledger Fabric?

You can generate events using a method ...READ MORE

Jul 26, 2018 in Blockchain by digger
 • 26,740 points • 1,236 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 • 574 views
0 votes
1 answer

How to solve “Error: Expected a Resource or Concept”?

There are few errors in code. I ...READ MORE

Jul 31, 2018 in Blockchain by slayer
 • 29,350 points • 1,004 views
+1 vote
1 answer

Can I setup hyperledger composer on multiple nodes?

To deploy your network on multiple nodes, ...READ MORE

Jul 25, 2018 in Blockchain by digger
 • 26,740 points • 1,222 views
0 votes
1 answer

Solidity code to change value of name

Try this for setName: function setName(string _name) public ...READ MORE

Jul 30, 2018 in Blockchain by slayer
 • 29,350 points • 1,057 views
0 votes
1 answer

How to create a Genesis Block in a Private Network?

{     "nonce": "0x0000000000000042",     "difficulty": "0x000000100",     "alloc": {     },     "mixhash": "0x0000000000000000000000000000000000000000000000000000000000000000",     "coinbase": "0x0000000000000000000000000000000000000000",     "timestamp": "0x00",     "parentHash": ...READ MORE

Jul 12, 2018 in Blockchain by digger
 • 26,740 points • 1,809 views
0 votes
1 answer

Could I share ledger between channels in hyperledger?

You say that you want to use ...READ MORE

Aug 3, 2018 in Blockchain by Johnathon
 • 9,090 points • 854 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 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 • 527 views
0 votes
1 answer

What is the purpose of Blockchain Technology?

The purpose of Blockchain technology is to ...READ MORE

Jul 23, 2018 in Blockchain by Omkar
 • 69,210 points • 1,400 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 • 483 views
0 votes
1 answer

How to get the current state of a smart contract?

Hey, you gotta provide the contract code, and ...READ MORE

Aug 1, 2018 in Blockchain by Perry
 • 17,100 points • 902 views
0 votes
1 answer

Solidity and Web.js for Ethereum blockchain data

Your code is not right. I have ...READ MORE

Jul 30, 2018 in Blockchain by digger
 • 26,740 points • 986 views
0 votes
1 answer

Can I upload or attach pdf to the blockchain payload?

Attaching the pdf directly to the blockchain ...READ MORE

Jul 25, 2018 in Blockchain by aryya
 • 7,450 points • 1,198 views
0 votes
1 answer

Unable to perform an operation in Ethereum private network

It seems that the Unix socket can't ...READ MORE

Jul 31, 2018 in Blockchain by Shashank
 • 10,400 points • 900 views
+2 votes
1 answer

What are the wallet path credentials for Web3j?

Follow the below steps: Go to the private ...READ MORE

Aug 2, 2018 in Blockchain by Omkar
 • 69,210 points • 1,519 views
+1 vote
1 answer

Can one pay ICO's token to an ICO consultant?

It is in fact possible to programmatically ...READ MORE

Aug 6, 2018 in Blockchain by Perry
 • 17,100 points • 591 views
0 votes
1 answer

Zip attachment in Corda: How to read zip file using InputStream?

You can not directly read the content ...READ MORE

Jul 25, 2018 in Blockchain by digger
 • 26,740 points • 1,136 views
0 votes
1 answer

How to solve “network state unknown. Review successful transactions manually” error?

There seems to be error in the ...READ MORE

Jul 27, 2018 in Blockchain by digger
 • 26,740 points • 1,045 views
0 votes
1 answer

GetState query via chaincode always returns empty value

fabric uses an ccenv image to build the chaincode when ...READ MORE

Jul 17, 2018 in Blockchain by Christine
 • 15,790 points • 1,461 views
0 votes
1 answer

Ethereum wallet not able to make transaction

I can see that the nonce you ...READ MORE

Aug 9, 2018 in Blockchain by slayer
 • 29,350 points • 474 views
0 votes
1 answer

What is the difference between Blockchin and Bitcoin

Blockchain has potential beyond Bitcoin and cryptocurrency. ...READ MORE

Jul 13, 2018 in Blockchain by shweta
 • 440 points • 1,620 views
0 votes
1 answer

How to make Geth transactions faster?

You can change the speed by the ...READ MORE

Jul 17, 2018 in Blockchain by slayer
 • 29,350 points • 1,446 views
0 votes
1 answer

How do I get updates in every blockchain append?

If you are really want to get ...READ MORE

Aug 9, 2018 in Blockchain by aryya
 • 7,450 points • 474 views
0 votes
1 answer

How would I run SpringBoot with the Java-SDK of Hyperledger Fabric java daemon?

I am not familiar with SpringBoot, but ...READ MORE

Jul 4, 2018 in Blockchain by aryya
 • 7,450 points • 2,028 views
0 votes
1 answer

Why we should create two connection profiles for one organization, i.e 1. Org1 only and Org1 and Org2 ?

The need for the distinct Org1 and ...READ MORE

Aug 6, 2018 in Blockchain by aryya
 • 7,450 points • 569 views
0 votes
1 answer

Web3j Transfer.sendFunds() returns Error “insufficient funds for gas * price + value”

DISCLAIMER. This may not necessarily be an answer to your ...READ MORE

Jun 16, 2018 in Blockchain by charlie_brown
 • 7,720 points • 2,758 views
0 votes
1 answer

Using web3swift to create raw transaction.

Here you go: var options = Web3Options.defaultOptions() options.gasLimit = ...READ MORE

Jul 31, 2018 in Blockchain by digger
 • 26,740 points • 804 views
0 votes
1 answer

Error in sending value to an Ethereum Smart Contract.

It is stated in Solidity 4.0 documentation ...READ MORE

Jul 23, 2018 in Blockchain by Perry
 • 17,100 points • 1,154 views
0 votes
1 answer

How to set web3 solidity variable value?

The setLog transaction has not yet been mined by ...READ MORE

Jul 6, 2018 in Blockchain by Christine
 • 15,790 points • 1,883 views
0 votes
1 answer

To capture events do we need to create assets using transaction processing functions?

I think you have figured it by ...READ MORE

Aug 10, 2018 in Blockchain by Christine
 • 15,790 points • 383 views
0 votes
1 answer

How can I create a feeless ERC-20 token?

You can't have another address pay for ...READ MORE

Aug 7, 2018 in Blockchain by Perry
 • 17,100 points • 511 views
0 votes
1 answer

Invalid Batch or signature in Savtooth

This will solve your problem import org.apache.commons.codec.binary.Hex; Transaction txn ...READ MORE

Aug 1, 2018 in Blockchain by digger
 • 26,740 points • 730 views
0 votes
1 answer

How can a composer fabric business network file, be deployed to the bluemix blockchain service today?

You can use Composer with the Bluemix ...READ MORE

Aug 8, 2018 in Blockchain by Johnathon
 • 9,090 points • 454 views
0 votes
1 answer

Cant install quorum blockchain.

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

Aug 1, 2018 in Blockchain by slayer
 • 29,350 points • 727 views
0 votes
1 answer

How does a downed peer connects back to the network in a fabric network?

This might be due to the expected ...READ MORE

Aug 8, 2018 in Blockchain by Johnathon
 • 9,090 points • 433 views
0 votes
1 answer

What is the expiry time of blockchain wallet address?

There is no expiry time for your ...READ MORE

Jul 26, 2018 in Blockchain by slayer
 • 29,350 points • 967 views
0 votes
1 answer

How do nodes communicate with each other in hyperledger?

First let me tell you that there ...READ MORE

Jul 17, 2018 in Blockchain by slayer
 • 29,350 points • 1,339 views
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