Most viewed questions in Blockchain

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1 answer

Efficiently sorting Ethereum blockchain.

What you are trying to do is ...READ MORE

Jul 25, 2018 in Blockchain by slayer
 • 29,370 points • 1,359 views
+1 vote
1 answer

How is data retrieved in Ethereum?

Blockchain uses the concept of Merkle trees ...READ MORE

Apr 16, 2018 in Blockchain by Shashank
 • 10,400 points • 1,359 views
0 votes
1 answer

How to solve Corda Node Startup Exception?

The error says "port may be in ...READ MORE

Jul 13, 2018 in Blockchain by digger
 • 26,740 points • 1,358 views
0 votes
0 answers

Is there any resource for hyper ledger fabric to learn?

Hi, I have searched all the google sites, ...READ MORE

Mar 2, 2020 in Blockchain by anonymous
 • 120 points • 1,356 views
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1 answer

How can I access the details of a given address from a blockchain?

There are two ways to actually do ...READ MORE

Jul 11, 2018 in Blockchain by Shashank
 • 10,400 points • 1,356 views
+1 vote
2 answers

What if a bitcoin clients could create identical private keys?

If this happens, then Person B will ...READ MORE

Aug 28, 2018 in Blockchain by Evan
 • 1,356 views
+1 vote
1 answer

Can a data be altered in a blockchain without changing its hash?

Yes, it should work. The authentication practice ...READ MORE

Apr 8, 2018 in Blockchain by Shashank
 • 10,400 points • 1,356 views
0 votes
1 answer

blockchain/service-my-wallet-v3 - Connection refused

Hey, if you have installed blockchain/service-my-wallet properly, ...READ MORE

Sep 18, 2018 in Blockchain by slayer
 • 29,370 points • 1,355 views
0 votes
1 answer

How should I set my mac to install "hyperledger composer playground locally" ?

Install the pre-reqs https://hyperledger.github.io/composer/in ...READ MORE

Jul 21, 2018 in Blockchain by Christine
 • 15,750 points • 1,355 views
0 votes
1 answer

Hyperledger composer: How to include relationship in custom query?

You are trying to use filter={"include":"resolve"} in Composer Query. ...READ MORE

Nov 16, 2018 in Blockchain by Omkar
 • 69,180 points • 1,353 views
0 votes
1 answer

Sawtooth Javascript SDK "Batchlist rejected" error

What you can do is use intkey-client to the ...READ MORE

Sep 19, 2018 in Blockchain by digger
 • 26,740 points • 1,353 views
0 votes
1 answer

Hyperledger : Deploying chaincode successful. But, cannot query - says ResourceNotFound

The problem(from logging) is dial unix /var/run/docker.sock: connect: ...READ MORE

Jun 21, 2018 in Blockchain by charlie_brown
 • 7,720 points • 1,353 views
0 votes
1 answer

how do we register our assets in hyperledger?

First of all, the chaincode (or smart ...READ MORE

May 26, 2018 in Blockchain by Johnathon
 • 9,090 points • 1,353 views
0 votes
1 answer

How do you obtain the transaction uuid after submitting an invoke transaction using the nodejs HFC

The results returned via the 'submitted' event ...READ MORE

Sep 14, 2018 in Blockchain by slayer
 • 29,370 points • 1,352 views
+1 vote
1 answer

Deploy contract using solcjs

Try to add some typo and run ...READ MORE

Sep 26, 2018 in Blockchain by slayer
 • 29,370 points • 1,350 views
0 votes
1 answer

Handling connection of new nodes in Decentralized Chatting application.

Libp2p handles discovery and connection of nodes ...READ MORE

Jun 29, 2018 in Blockchain by Omkar
 • 69,180 points • 1,350 views
+1 vote
1 answer

How do I develop enterprise solutions using hyperledger composer?

With IBM cloud you can use containers, ...READ MORE

May 15, 2018 in Blockchain by Shashank
 • 10,400 points • 1,349 views
+1 vote
2 answers

Hyperledger - Can I have some instances on one network while on a Virtual Box?

Yes, you can connect multiple instances to ...READ MORE

Aug 1, 2018 in Blockchain by Omkar
 • 69,180 points • 1,348 views
+1 vote
1 answer

Where to download the corda network bootstrapper 3.1 or 3.2 version for r3 corda?

Here are the steps to setup corda ...READ MORE

Jun 24, 2019 in Blockchain by Raghu
 • 1,346 views
0 votes
1 answer

Not able to start testrpc for Ethereum truffle

Hey. It seems like you already have ...READ MORE

Nov 28, 2018 in Blockchain by Omkar
 • 69,180 points • 1,345 views
0 votes
1 answer

Transaction Id in Bitcoin Blockchain

The TransactionId comes from sending the coin. ...READ MORE

Jul 13, 2018 in Blockchain by Christine
 • 15,750 points • 1,345 views
0 votes
1 answer

Can't install pyethereum module

The module's name is ethereum, not pyethereum. Using the ...READ MORE

Sep 27, 2018 in Blockchain by slayer
 • 29,370 points • 1,344 views
+1 vote
1 answer

How hyperledger fabric is stored on a PC?

Firstly, your web application will interact with ...READ MORE

Apr 7, 2018 in Blockchain by Christine
 • 15,750 points • 1,344 views
0 votes
1 answer

JAVA Retrive current bitcoin price with JSON

You should start log Exceptions when you ...READ MORE

Feb 28, 2022 in Blockchain by Soham
 • 9,730 points • 1,343 views
0 votes
1 answer

Hyperledger Fabric 1.0 how to maintain privacy from OSNs?

Yes, OSNs can see all the transaction ...READ MORE

Jul 2, 2018 in Blockchain by Omkar
 • 69,180 points • 1,343 views
+1 vote
1 answer

What are the differences between coin and token?

Coins are cryptocurrencies that are independent and ...READ MORE

Jul 18, 2018 in Blockchain by Sahil
 • 1,343 views
0 votes
1 answer

Ethereum Mist: Compiling Error with sha3

First run: npm install sha3 and then sudo ...READ MORE

Oct 24, 2018 in Blockchain by Omkar
 • 69,180 points • 1,342 views
0 votes
1 answer

Not able to invoke a contract in Ethereum Private chain using geth

Hope this helps: contract mortal { /* ...READ MORE

Oct 22, 2018 in Blockchain by Omkar
 • 69,180 points • 1,342 views
0 votes
1 answer

(0.7/0.001)%10 does not return 0

bcmath module can help you bcmod(bcdiv("0.7", "0.001"), "10"); // ...READ MORE

Aug 31, 2018 in Blockchain by digger
 • 26,740 points • 1,341 views
0 votes
1 answer

Unable to request channel creation using Rest Api

I'd recommend taking a look at the ordering ...READ MORE

Jul 16, 2018 in Blockchain by Perry
 • 17,100 points • 1,340 views
0 votes
1 answer

What if I change Chaincode state in invokeChaincode?

The chaincode state is not changed when ...READ MORE

Jul 13, 2018 in Blockchain by slayer
 • 29,370 points • 1,340 views
0 votes
2 answers

Hyperledger Fabric: invokeChaincode returns [Object object]

Replace  return shim.success(valString); with: return shim ...READ MORE

Nov 9, 2018 in Blockchain by Omkar
 • 69,180 points • 1,338 views
0 votes
2 answers

sendmany bitcoin command problem in Dynamic PHP array

You might consider spliiting that array up ...READ MORE

Sep 3, 2018 in Blockchain by Tenneb
 • 1,336 views
+5 votes
1 answer

What are the programming languages I should know to become a Blockchain Developer?

Well, what programming language you have to ...READ MORE

Sep 25, 2018 in Blockchain by digger
 • 26,740 points • 1,335 views
0 votes
1 answer

how to give back each customer a self-defined amount of ether after ICO ends in smart contract?

It's a lot of question. I will ...READ MORE

Aug 1, 2018 in Blockchain by aryya
 • 7,460 points • 1,335 views
0 votes
1 answer

Issue deploying the business network using hyperledger composer

I had same issue. I created card ...READ MORE

Jun 5, 2018 in Blockchain by Johnathon
 • 9,090 points • 1,335 views
0 votes
1 answer

Currency Conversion using PHP

Please find below an example of converting ...READ MORE

Apr 6, 2022 in Blockchain by Soham
 • 9,730 points • 1,334 views
0 votes
1 answer

Hyperledger Composer: Error: Object with ID 'assetID:0138' in collection with ID 'Asset:org.acme.mynetwork.Sensor'

Remove 'assetID:' from your test string. For example, 'org.acme.mynetwork#assetID:0138' ...READ MORE

Nov 14, 2018 in Blockchain by Omkar
 • 69,180 points • 1,332 views
0 votes
1 answer

How to get iota balance via api url?

Either run your own node (thus, the localhost reference ...READ MORE

Sep 12, 2018 in Blockchain by digger
 • 26,740 points • 1,331 views
0 votes
1 answer

Error With Rest Server: HyperLedger

It's a trivial issue mate - you're ...READ MORE

Nov 9, 2018 in Blockchain by Christine
 • 15,750 points • 1,330 views
0 votes
1 answer

How do i startup the quantum resistant ledger (QRL) node?

There is an open issue in GitHub ...READ MORE

Jul 31, 2018 in Blockchain by Shashank
 • 10,400 points • 1,327 views
0 votes
1 answer

How to get genesis block value at new bitcoin source?

chainparams.cpp contains a line of code that ...READ MORE

Sep 4, 2018 in Blockchain by digger
 • 26,740 points • 1,326 views
0 votes
1 answer

Is IPFS, blockchain a decentralized file system?

HTTP protocol is the most popular on ...READ MORE

May 31, 2018 in Blockchain by Shashank
 • 10,400 points • 1,323 views
0 votes
1 answer

Hyperledger Composer rest server NPM versions

The Hyperledger Composer pre-requisites can be installed ...READ MORE

Jul 13, 2018 in Blockchain by Christine
 • 15,750 points • 1,322 views
0 votes
1 answer

If a different chaincode deployed a world state variable, is it still accessible by another chaincode?

No, variables stored by some chaincode (A) ...READ MORE

Apr 4, 2018 in Blockchain by Perry
 • 17,100 points • 1,321 views
0 votes
1 answer

How to trigger change blockchain network request on MetaMask

was finally able to find the answer: await ...READ MORE

Mar 31, 2022 in Blockchain by Rahul
 • 9,690 points • 1,320 views
0 votes
1 answer

Testrpc Error: listen EADDRINUSE :::8545 on Mac

Another process is already using the port ...READ MORE

Sep 26, 2018 in Blockchain by digger
 • 26,740 points • 1,319 views
+1 vote
1 answer

Error attempting installing ethermint

I faced the same issue. Here's where ...READ MORE

Aug 2, 2018 in Blockchain by Christine
 • 15,750 points • 1,319 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 • 1,319 views
0 votes
1 answer

Looking for a simple Blockchain PoC to implement on a office level

Hyperledger has been collecting some use cases, though not ...READ MORE

Jul 24, 2018 in Blockchain by aryya
 • 7,460 points • 1,317 views
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