Most answered questions in Blockchain

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Security threat principles for Blockchain

These are some steps to prevent/eliminate security threats ...READ MORE

Feb 13, 2019 in Blockchain by Omkar
 • 69,210 points • 1,067 views
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What is 51% attack in Blockchain?

51% Attack is a situation where a group ...READ MORE

Feb 13, 2019 in Blockchain by Omkar
 • 69,210 points • 671 views
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Why is off-chain transaction used?

Though on-chain transactions secure data, off-chain transactions ...READ MORE

Feb 13, 2019 in Blockchain by Omkar
 • 69,210 points • 347 views
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What are off-chain transactions?

An off-chain transaction is the movement of ...READ MORE

Feb 13, 2019 in Blockchain by Omkar
 • 69,210 points • 1,255 views
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Blockchain secret sharing

Blockchain has many methods to provide data ...READ MORE

Feb 12, 2019 in Blockchain by Omkar
 • 69,210 points • 1,064 views
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Use of Blind Signature

Bling Signature is a form of digital signature in ...READ MORE

Feb 12, 2019 in Blockchain by Omkar
 • 69,210 points • 667 views
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Not able to install ganache

There is an alternative method. You can ...READ MORE

Feb 8, 2019 in Blockchain by Omkar
 • 69,210 points • 2,255 views
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Not able to set up the testrpc or geth client on ubuntu

The commands you have used installs Ethereum ...READ MORE

Feb 8, 2019 in Blockchain by Omkar
 • 69,210 points • 589 views
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How to select a single account in Ganache?

When you use web3, selecting a single ...READ MORE

Feb 5, 2019 in Blockchain by Omkar
 • 69,210 points • 1,560 views
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How will I know the result of Fabric Transaction from application client?

When a transaction happens, a proposal response ...READ MORE

Feb 5, 2019 in Blockchain by Omkar
 • 69,210 points • 543 views
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Does Hyperledger support Smart Contract like Ethereum?

Yes, but not exactly true. Ethereum uses ...READ MORE

Feb 4, 2019 in Blockchain by Omkar
 • 69,210 points • 713 views
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Do the orderers see the transaction data in Hyperledger Fabric?

No, the orderers do not see the ...READ MORE

Feb 4, 2019 in Blockchain by Omkar
 • 69,210 points • 888 views
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How to ensure data privacy in Hyperledger Fabric?

There are different ways data privacy in ...READ MORE

Jan 31, 2019 in Blockchain by Omkar
 • 69,210 points • 1,494 views
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Does a hyperledger fabric application client need to connect to all peers?

No, it is not necessary to connect ...READ MORE

Jan 31, 2019 in Blockchain by Omkar
 • 69,210 points • 1,052 views
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How many peers in fabric network need to endorse a transaction?

The number of peers required to endorse ...READ MORE

Jan 31, 2019 in Blockchain by Omkar
 • 69,210 points • 1,829 views
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Truffle deployer is not working

If you have deployed it before, then ...READ MORE

Jan 29, 2019 in Blockchain by Omkar
 • 69,210 points • 1,125 views
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Cannot read property 'getBlock' of undefined

getBlock is used by web3 and to use it, ...READ MORE

Jan 29, 2019 in Blockchain by Omkar
 • 69,210 points • 1,339 views
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Not able to install truffle

This error occurs when there are permission ...READ MORE

Jan 29, 2019 in Blockchain by Omkar
 • 69,210 points • 1,862 views
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program can't start because cudart64_70.dll is missing

You might have missed out installing the ...READ MORE

Jan 29, 2019 in Blockchain by Omkar
 • 69,210 points • 833 views
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Truffle does not open console, instead opens truffle.js file

When running truffle commands on Windows system, ...READ MORE

Jan 29, 2019 in Blockchain by Omkar
 • 69,210 points • 768 views
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Private ethereum network account balance is zero

There are two reasons due to which ...READ MORE

Jan 28, 2019 in Blockchain by Omkar
 • 69,210 points • 1,705 views
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Not able to connect nodes on Ethereum Private Network using bootnodes.

If you have created the private network ...READ MORE

Jan 27, 2019 in Blockchain by Omkar
 • 69,210 points • 1,626 views
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Geth console can’t access smart contract

You are running commands using an object ...READ MORE

Jan 27, 2019 in Blockchain by Omkar
 • 69,210 points • 854 views
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Ethereum transaction not getting Updated

You have done everything right except for ...READ MORE

Jan 27, 2019 in Blockchain by Omkar
 • 69,210 points • 677 views
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Variable declaration problem in truffle console.

The reason it says “undefined” is because ...READ MORE

Jan 27, 2019 in Blockchain by Omkar
 • 69,210 points • 1,125 views
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How to create custom accounts in testrpc?

Yes, you can use testrpc to do ...READ MORE

Jan 27, 2019 in Blockchain by Omkar
 • 69,210 points • 482 views
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Calling Truffle Commands through a script

Seems like its due to async behavior ...READ MORE

Jan 25, 2019 in Blockchain by Omkar
 • 69,210 points • 1,100 views
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1 answer

How to run a Javascript in truffle console?

There are two ways to do this. You ...READ MORE

Jan 24, 2019 in Blockchain by Omkar
 • 69,210 points • 2,160 views
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How to call a payable contract function from truffle console?

You can use a contract function, on ...READ MORE

Jan 24, 2019 in Blockchain by Omkar
 • 69,210 points • 2,323 views
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Truffle dev says my function is not a function

It seems you are using truffle v5. ...READ MORE

Jan 24, 2019 in Blockchain by Omkar
 • 69,210 points • 1,951 views
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1 answer

Solidity Error: Exceeds block gas limit

Remove the line norpc:true and change the ...READ MORE

Jan 24, 2019 in Blockchain by Omkar
 • 69,210 points • 2,612 views
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Truffle can not find artifacts error

To deploy any project/ smart contract, you ...READ MORE

Jan 24, 2019 in Blockchain by Omkar
 • 69,210 points • 4,643 views
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truffle migrate Error: “Cannot find module 'truffle-expect'”

Seems like you are missing some modules ...READ MORE

Jan 24, 2019 in Blockchain by Omkar
 • 69,210 points • 1,069 views
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1 answer

Unexpected error: Cannot provision contracts while instantiating the console

This is a common problem with truffle ...READ MORE

Jan 23, 2019 in Blockchain by Omkar
 • 69,210 points • 628 views
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Not able to install truffle-contract

There’s a permission error. Run this command ...READ MORE

Jan 23, 2019 in Blockchain by Omkar
 • 69,210 points • 1,907 views
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Solidity: casting address to address payable

I don’t see why direct casting isn’t ...READ MORE

Jan 23, 2019 in Blockchain by Omkar
 • 69,210 points • 7,582 views
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Error while sending an address to functions

In solidity 0.5.0 (and above) there are ...READ MORE

Jan 23, 2019 in Blockchain by Omkar
 • 69,210 points • 2,950 views
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Not able to use ERC721 token in my project

Like this error indicates, you have to ...READ MORE

Jan 23, 2019 in Blockchain by Omkar
 • 69,210 points • 614 views
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'env' is not recognized as an internal or external command

According to the error, it seems like ...READ MORE

Jan 23, 2019 in Blockchain by Omkar
 • 69,210 points • 14,577 views
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How can I call a contract from another contract?

There are two ways to solve this. ...READ MORE

Jan 23, 2019 in Blockchain by Omkar
 • 69,210 points • 1,538 views
–1 vote
1 answer

Problem adding peers to Ethereum private network

Seems like you have not created the ...READ MORE

Jan 23, 2019 in Blockchain by Omkar
 • 69,210 points • 2,258 views
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How to add peer to ethereum private network?

To connect a node to already existing ...READ MORE

Jan 22, 2019 in Blockchain by Omkar
 • 69,210 points • 2,743 views
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Problem monitoring geth instance

Try the following command: geth monitor --attach ./chain-data/geth.ipc ...READ MORE

Jan 22, 2019 in Blockchain by Omkar
 • 69,210 points • 534 views
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1 answer

Truffle migrate network error

When you are running truffle on a ...READ MORE

Jan 18, 2019 in Blockchain by Omkar
 • 69,210 points • 603 views
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Not able to deploy smart contract to private network

This could happen due to 3 possible ...READ MORE

Jan 18, 2019 in Blockchain by Omkar
 • 69,210 points • 764 views
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1 answer

Testrpc can't find log handlers

This doesn't usually happen, maybe the log ...READ MORE

Jan 18, 2019 in Blockchain by Omkar
 • 69,210 points • 514 views
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Truffle migrate Server Error

Seems like truffle didn't find a server. ...READ MORE

Jan 18, 2019 in Blockchain by Omkar
 • 69,210 points • 363 views
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Truffle "Migrations" ran out of gas error

This error is caused because the amount ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
 • 69,210 points • 3,898 views
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"Migrations" exceeded the block limit (with a gas value you set).

In the error you have posted, in ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
 • 69,210 points • 5,571 views
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"Migrations" -- Returned error: authentication needed: password or unlock.

By default, the accounts are locked and ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
 • 69,210 points • 3,979 views
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