Most voted questions in Blockchain

0 votes
1 answer

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 • 1,694 views
0 votes
1 answer

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 • 1,616 views
0 votes
1 answer

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 • 844 views
0 votes
1 answer

Ethereum transaction not getting Updated

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

Jan 27, 2019 in Blockchain by Omkar
 • 69,210 points • 674 views
0 votes
1 answer

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 • 1,121 views
0 votes
1 answer

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
0 votes
0 answers

How can i get all the smart contract transaction details that have been done by a user in java web3j?

Jan 25, 2019 in Blockchain by Ashish Gopal Hattimare
 • 989 views
0 votes
1 answer

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 • 1,095 views
0 votes
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 • 2,150 views
0 votes
1 answer

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 • 2,316 views
0 votes
1 answer

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 • 1,940 views
0 votes
0 answers

WA: With the wings of the technology, constantly broadening the field of development

According to the history, in the Internet ...READ MORE

Jan 24, 2019 in Blockchain by anonymous
recategorized Jan 24, 2019 by Vardhan • 284 views
0 votes
0 answers

How does Atox debut in the center of cross-border payment industry?

Introduction: The “global village” created by the ...READ MORE

Jan 24, 2019 in Blockchain by anonymous
recategorized Jan 24, 2019 by Vardhan • 351 views
0 votes
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 • 2,597 views
0 votes
1 answer

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 • 4,632 views
0 votes
1 answer

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 • 1,065 views
0 votes
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 • 623 views
0 votes
1 answer

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 • 1,901 views
0 votes
1 answer

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 • 7,569 views
0 votes
1 answer

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 • 2,947 views
0 votes
1 answer

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 • 610 views
0 votes
1 answer

'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 • 14,552 views
0 votes
1 answer

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 • 1,527 views
0 votes
0 answers

AXC: Conform to the trend of the times and to be a pioneer in the development of the industry

On January 2, 2019, Ali Baba DAMO ...READ MORE

Jan 23, 2019 in Blockchain by anonymous
retagged Jan 23, 2019 by Vardhan • 636 views
0 votes
1 answer

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 • 2,735 views
0 votes
1 answer

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 • 525 views
0 votes
0 answers

AtoX leads blockchain 4.0

Since Satoshi Nakamoto created bitcoin in 2008, ...READ MORE

Jan 21, 2019 in Blockchain by TONGZHENG
retagged Jan 24, 2019 by Omkar • 619 views
0 votes
1 answer

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 • 752 views
0 votes
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 • 495 views
0 votes
1 answer

Truffle migrate Server Error

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

Jan 18, 2019 in Blockchain by Omkar
 • 69,210 points • 355 views
0 votes
1 answer

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 • 3,894 views
0 votes
1 answer

"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 • 5,551 views
0 votes
1 answer

"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 • 3,974 views
0 votes
1 answer

Truffle compile compilation failed

This is a version compatibility problem. In ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
 • 69,210 points • 3,399 views
0 votes
2 answers

Truffle compile: SyntaxError: No visibility specified. Did you intend to add "public"?

You can try another method : contract HelloWorld{       function ...READ MORE

Mar 18, 2019 in Blockchain by anonymous
 • 3,609 views
0 votes
1 answer

geth attach command showing error: bind: address already in use

Seems like there is already a geth instance ...READ MORE

Jan 16, 2019 in Blockchain by Omkar
 • 69,210 points • 2,302 views
0 votes
2 answers

“geth attach” command shows error: Fatal: Unable to attach to remote geth

please check from root, sudo -i geth attach READ MORE

Nov 7, 2020 in Blockchain by balachandar
 • 140 points • 6,550 views
0 votes
1 answer

Not able to connect to Ethereum node in web browser

By default, geth listens only to localhost. ...READ MORE

Jan 16, 2019 in Blockchain by Omkar
 • 69,210 points • 1,705 views
0 votes
1 answer

How to sync private nodes in geth and testRPC locally?

HI. As much as I know, running ...READ MORE

Jan 16, 2019 in Blockchain by Omkar
 • 69,210 points • 1,066 views
0 votes
1 answer

geth personal.newAccount() shows password error

You have to pass the password as ...READ MORE

Jan 16, 2019 in Blockchain by Omkar
 • 69,210 points • 771 views
0 votes
1 answer

Why to use libraries over Json-RPC to interact with Blockchain?

Though Json-RPC provides methods to interact with ...READ MORE

Jan 11, 2019 in Blockchain by Omkar
 • 69,210 points • 525 views
0 votes
1 answer

How to interact with blockchain from web application?

You can use the Web3.js library to interact ...READ MORE

Jan 11, 2019 in Blockchain by Omkar
 • 69,210 points • 1,109 views
0 votes
1 answer

Why is geth --fast faster in downloading the Blockchain?

When you use the --fast flag to download the Blockchain, ...READ MORE

Jan 10, 2019 in Blockchain by Omkar
 • 69,210 points • 900 views
0 votes
1 answer

How to get Node URL in private ethereum network?

You have already noticed that  admin.peers does ...READ MORE

Jan 10, 2019 in Blockchain by Omkar
 • 69,210 points • 1,535 views
0 votes
1 answer

admin.peer not working

There is a typo in your command. ...READ MORE

Jan 10, 2019 in Blockchain by Omkar
 • 69,210 points • 423 views
0 votes
1 answer

How to get IP address of peer connected in private ethereum network?

To get these details, you can use ...READ MORE

Jan 10, 2019 in Blockchain by Omkar
 • 69,210 points • 2,840 views
0 votes
1 answer

How to check peer connectivity in ethereum private network?

You can use the net module to check the ...READ MORE

Jan 10, 2019 in Blockchain by Omkar
 • 69,210 points • 1,330 views
0 votes
1 answer

How to check ethereum logs?

Hey there! You don't have a Verbose ...READ MORE

Jan 9, 2019 in Blockchain by Omkar
 • 69,210 points • 9,256 views
0 votes
1 answer

Not able to send ethers in private ethereum network

Your account is locked by default due ...READ MORE

Jan 9, 2019 in Blockchain by Omkar
 • 69,210 points • 871 views
0 votes
1 answer

How to set miner threads outside geth console?

Yes, you can set the miner threads ...READ MORE

Jan 9, 2019 in Blockchain by Omkar
 • 69,210 points • 1,158 views
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