Most answered questions in Blockchain

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Ethereum Node Connection: TypeError: Cannot read property 'version' of undefined

In the code that you are using ...READ MORE

Oct 24, 2018 in Blockchain by Omkar
 • 69,230 points • 1,726 views
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1 answer

Hyperledger Fabric v1.0 setup on multiple machines

You would be able to host hyperledger fabric ...READ MORE

Oct 23, 2018 in Blockchain by Perry
 • 17,100 points • 1,285 views
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Hyperledger fabric: curl not working to invoke chaincode

Hyperledger Fabric does not offer a REST ...READ MORE

Oct 23, 2018 in Blockchain by Perry
 • 17,100 points • 992 views
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1 answer

Nodejs cannot access Hyperledger composer shows error

1) you need Node 8.9.x or higher ...READ MORE

Oct 23, 2018 in Blockchain by Perry
 • 17,100 points • 718 views
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1 answer

re hyperledger's node/sdk: there is no typing definition( index.d.ts )

Looks like a bug in that the ...READ MORE

Oct 23, 2018 in Blockchain by Perry
 • 17,100 points • 603 views
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1 answer

Ethereum truffle MetaCoin : 'intrinsic gas too low' error

Change the genesis block gasLimit to "gasLimit": "0x2FEFD800", config ...READ MORE

Oct 22, 2018 in Blockchain by Omkar
 • 69,230 points • 1,118 views
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1 answer

PHP IPC with geth Ethereum: How to communicate with client?

You have to use PHP Sockets $sock = socket_create(AF_UNIX, ...READ MORE

Oct 22, 2018 in Blockchain by Omkar
 • 69,230 points • 1,488 views
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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
 • 69,230 points • 742 views
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1 answer

Web3js: how to catch ethereum contract exception?

try this: try{ Test test = Test.load(contractObj.getContractAddress(), ...READ MORE

Oct 22, 2018 in Blockchain by Omkar
 • 69,230 points • 2,061 views
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1 answer

Solidity Web3js: Invalid number of arguments to Solidity function error

Try this: Change console.log(formData.destinationtoke); console.log(formData.amounttoke); var tx = sendtoken(destinationtoke, amounttoke); To : console.log(formData.destinationtoke); console.log(formData.amounttoke); var ...READ MORE

Oct 22, 2018 in Blockchain by Omkar
 • 69,230 points • 2,575 views
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1 answer

How to read the ETH value and other token values from an account?

You can do this eth.accounts shows you all known ...READ MORE

Oct 22, 2018 in Blockchain by Omkar
 • 69,230 points • 618 views
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1 answer

Web3: No provider set error

To solve this error, you need to ...READ MORE

Oct 22, 2018 in Blockchain by Omkar
 • 69,230 points • 1,704 views
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1 answer

Solidity: How to return id from hash value?

You can do it by storing the hash ...READ MORE

Oct 22, 2018 in Blockchain by Omkar
 • 69,230 points • 2,100 views
+1 vote
1 answer

Using bccsp instance from chaincode

You can take a look at this code snippet. ...READ MORE

Oct 22, 2018 in Blockchain by Christine
 • 15,790 points • 596 views
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Hyperledger on Kubernetes - How can Kubernetes be aware of Chaincode container

I have been investigating the same issue ...READ MORE

Oct 22, 2018 in Blockchain by Christine
 • 15,790 points • 1,277 views
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1 answer

Can one contract own tokens of another contract?

Yes, contracts can own tokens. The transaction you ...READ MORE

Oct 17, 2018 in Blockchain by Christine
 • 15,790 points • 1,321 views
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1 answer

How to install v1.7.3. of Geth using ppa?

The Ethereum PPA generally provides the latest ...READ MORE

Oct 17, 2018 in Blockchain by Christine
 • 15,790 points • 1,014 views
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1 answer

How to get ethereum contract public variables?

You need to use call method, it ...READ MORE

Oct 17, 2018 in Blockchain by Christine
 • 15,790 points • 1,725 views
+1 vote
1 answer

Return array of struct from a solidity function: "Expected type name function getPurchaseOrderForVendor" error

There's a typo in your code. The ...READ MORE

Oct 17, 2018 in Blockchain by Christine
 • 15,790 points • 4,919 views
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1 answer

sellprice and buyprice fixing in smart contract.

It is due to the fact you ...READ MORE

Oct 17, 2018 in Blockchain by Christine
 • 15,790 points • 461 views
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1 answer

Integrating web3 in cloud functions module

I had this issue and my problem ...READ MORE

Oct 17, 2018 in Blockchain by Perry
 • 17,100 points • 993 views
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1 answer

How to set the hex-encoded data field in a Web3j Ethereum transaction?

You can use the "data" field of ...READ MORE

Oct 15, 2018 in Blockchain by Omkar
 • 69,230 points • 2,755 views
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1 answer

How to handle smart contract transaction express nodejs?

sendSignedTransaction returns a Promise combined event emitter. You can ...READ MORE

Oct 15, 2018 in Blockchain by Omkar
 • 69,230 points • 1,771 views
0 votes
1 answer

Ethereum nodejs: Unhandled rejection Error: Invalid JSON RPC response

gasLimit is actually represented by gas as the gas limiter ...READ MORE

Oct 15, 2018 in Blockchain by Omkar
 • 69,230 points • 2,210 views
0 votes
1 answer

Ethereum solidity: Unable to get value from another contract

I have faced similar issues when compiling ...READ MORE

Oct 15, 2018 in Blockchain by Omkar
 • 69,230 points • 1,496 views
0 votes
1 answer

What is the default network that truffle migrates to when the config has 2 networks?

If --network is unspecified, it deploys to only development. You ...READ MORE

Oct 15, 2018 in Blockchain by Omkar
 • 69,230 points • 1,467 views
0 votes
1 answer

Ethereum nodejs: Contract address returning as undefined in console

As per the documentation, if you deploy the ...READ MORE

Oct 15, 2018 in Blockchain by Omkar
 • 69,230 points • 1,630 views
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1 answer

How to save complex object in the contract in solidity

You can't pass objects when initiating a ...READ MORE

Oct 15, 2018 in Blockchain by Omkar
 • 69,230 points • 3,346 views
0 votes
1 answer

Solidity geth: Error encountered during contract execution [Bad instruction]

recipes is a dynamic storage array. You need ...READ MORE

Oct 15, 2018 in Blockchain by Omkar
 • 69,230 points • 1,261 views
0 votes
1 answer

UnhandledPromiseRejectionWarning: Insufficient funds error in Ethereum: NodeJS web3

sendSignedTransaction returns a promiEvent onto which you can chain then and catch: web3.eth.sendSignedTransaction('0x' + ...READ MORE

Oct 15, 2018 in Blockchain by Omkar
 • 69,230 points • 1,223 views
0 votes
1 answer

Solidity: logical AND outputs parser error

Its Syntax error logical and operator is ...READ MORE

Oct 12, 2018 in Blockchain by Perry
 • 17,100 points • 1,603 views
0 votes
1 answer

How do Ethereum node compete for blocks?

Yes, all the nodes do compete for ...READ MORE

Oct 12, 2018 in Blockchain by Perry
 • 17,100 points • 584 views
0 votes
1 answer

How to force gradle to take UTF-8 encoding instead of operating system default encoding?

I've removed the UTF-8 chars from erroneous ...READ MORE

Oct 12, 2018 in Blockchain by Perry
 • 17,100 points • 7,084 views
0 votes
1 answer

How to input realtime data from google sheets into urlfetch google scripts?

Based on your title I hope to ...READ MORE

Oct 12, 2018 in Blockchain by Perry
 • 17,100 points • 1,308 views
0 votes
1 answer

Is the msg.sender address changed while passing to another contract as a parameter?

I tried your contracts in Remix, but ...READ MORE

Oct 10, 2018 in Blockchain by Omkar
 • 69,230 points • 1,159 views
0 votes
1 answer

Blockchain: Installing an earlier version of ethereum using apt-get on

geth does not make the previous version available ...READ MORE

Oct 10, 2018 in Blockchain by Omkar
 • 69,230 points • 1,144 views
0 votes
1 answer

Using json rpc with curl on java?

Quoting different pieces the way you're doing ...READ MORE

Oct 10, 2018 in Blockchain by Omkar
 • 69,230 points • 2,428 views
0 votes
1 answer

Ethereum generating genesis Python Syntax

print in python3 is a method not a ...READ MORE

Oct 10, 2018 in Blockchain by Omkar
 • 69,230 points • 676 views
0 votes
1 answer

Where is the geth.exe in the Ethereum mist?

In Windows, you will find geth.exe in a path ...READ MORE

Oct 10, 2018 in Blockchain by Omkar
 • 69,230 points • 679 views
0 votes
1 answer

TypeError: XMLHttpRequest is not a function when using web3 on meteor server side

I had the same problem. Instead ethereum:web3 Meteor package ...READ MORE

Oct 10, 2018 in Blockchain by Omkar
 • 69,230 points • 863 views
0 votes
1 answer

Getting Invalid number of parameters for “undefined” when deploying smart contract

Try something like this for contracts that ...READ MORE

Oct 10, 2018 in Blockchain by Omkar
 • 69,230 points • 2,913 views
0 votes
1 answer

Calling function in truffle console error

Inside Truffle console ContractName.deployed().then(function(instance){app = instance}) app.adopt(23)//call method on ...READ MORE

Oct 10, 2018 in Blockchain by Omkar
 • 69,230 points • 2,713 views
0 votes
1 answer

Transfer the gas value of contract to my own address

Works fine for me: pragma solidity ^0.4.0; contract Test ...READ MORE

Oct 10, 2018 in Blockchain by Omkar
 • 69,230 points • 380 views
0 votes
1 answer

Store contract results tag in a variable

then() takes a function as argument that is ...READ MORE

Oct 9, 2018 in Blockchain by Omkar
 • 69,230 points • 356 views
0 votes
1 answer

Ethereum: functions Burn and Transfer source

This statement is used to publish an event that ...READ MORE

Oct 9, 2018 in Blockchain by Omkar
 • 69,230 points • 1,774 views
0 votes
1 answer

Etheruem: Unable to import library in Remix IDE

Your link is broken. This is the ...READ MORE

Oct 9, 2018 in Blockchain by Omkar
 • 69,230 points • 1,370 views
0 votes
1 answer

Creating an account with web3.js v0.2.6

The answer is let a=web3.personal.newAccount('!@superpassword') H ...READ MORE

Oct 9, 2018 in Blockchain by Omkar
 • 69,230 points • 526 views
0 votes
1 answer

How to allow request from host machine and deny from other machine, using ethereum in docker?

You can restrict access to the port ...READ MORE

Oct 9, 2018 in Blockchain by Omkar
 • 69,230 points • 539 views
0 votes
1 answer

Nodejs Express: Getting different output in console.log and callback

If your getOrderStatus() function is like this: function getOrderStatus(_orderId, callback) ...READ MORE

Oct 9, 2018 in Blockchain by Omkar
 • 69,230 points • 348 views
0 votes
1 answer

I am not able to change array elements globally

Remove the constant modifier from getArray(). constant functions do not write state ...READ MORE

Oct 9, 2018 in Blockchain by Omkar
 • 69,230 points • 468 views
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