Recent questions tagged blockchain

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1 answer

Web3j: Writing operations on a contract always throw “java.lang.ArrayIndexOutOfBoundsException”

Oct 1, 2018 in Blockchain by digger
 • 26,740 points • 753 views
0 votes
1 answer

Send all Tokens and Eth to a Address automatically

Oct 1, 2018 in Blockchain by slayer
 • 29,370 points • 4,442 views
0 votes
1 answer

Ethereum client-go RPC response 403 “invalid host specified”

Oct 1, 2018 in Blockchain by digger
 • 26,740 points • 2,122 views
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How to call function in one contract from another contract in private blockchain?

Oct 1, 2018 in Blockchain by slayer
 • 29,370 points • 972 views
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1 answer

web3.eth.sendSignedTransaction() always return “Returned error: nonce too low”

Oct 1, 2018 in Blockchain by digger
 • 26,740 points • 6,257 views
0 votes
1 answer

Solidity mocha : address is not a contract error

Oct 1, 2018 in Blockchain by slayer
 • 29,370 points • 1,247 views
0 votes
1 answer

Add Peers does not add a peer in Geth console

Sep 28, 2018 in Blockchain by digger
 • 26,740 points • 3,053 views
0 votes
1 answer

Invalid method parameters for eth_sendTransaction

Sep 28, 2018 in Blockchain by slayer
 • 29,370 points • 2,045 views
0 votes
1 answer

NodeJS POST Request Over JSON-RPC

Sep 28, 2018 in Blockchain by slayer
 • 29,370 points • 2,470 views
0 votes
1 answer

How to run Meteor insert within a Fiber?

Sep 28, 2018 in Blockchain by digger
 • 26,740 points • 921 views
0 votes
1 answer

How to get value from solidity contract using java?

Sep 28, 2018 in Blockchain by digger
 • 26,740 points • 2,177 views
0 votes
1 answer

Etheruem: Pyethereum Error

Sep 28, 2018 in Blockchain by slayer
 • 29,370 points • 552 views
0 votes
1 answer

Uncaught ReferenceError: web3 is not defined at window.onload

Sep 28, 2018 in Blockchain by digger
 • 26,740 points • 2,517 views
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1 answer

How are the ethers sent to smart contract in the IBM example?

Sep 28, 2018 in Blockchain by slayer
 • 29,370 points • 690 views
0 votes
1 answer

Can't call contract function in truffle console

Sep 28, 2018 in Blockchain by digger
 • 26,740 points • 3,237 views
0 votes
1 answer

Why estimateGas always returns null or zero?

Sep 28, 2018 in Blockchain by slayer
 • 29,370 points • 1,387 views
0 votes
1 answer

ethereum eth_sendTransaction via PHP curl

Sep 27, 2018 in Blockchain by digger
 • 26,740 points • 5,140 views
+1 vote
3 answers

Pass parameter as bytes32 to Solidity Smart Contract

Sep 27, 2018 in Blockchain by slayer
 • 29,370 points • 9,994 views
0 votes
1 answer

How to achieve simple OOP in Solidity?

Sep 27, 2018 in Blockchain by digger
 • 26,740 points • 994 views
0 votes
1 answer

Truffle init: throw er; // Unhandled 'error' event

Sep 27, 2018 in Blockchain by slayer
 • 29,370 points • 2,683 views
0 votes
1 answer

NPM cannot install “truffle” on Windows

Sep 27, 2018 in Blockchain by digger
 • 26,740 points • 4,270 views
0 votes
3 answers

python ethereum (pyethapp): Failed building wheel for scrypt.

Sep 27, 2018 in Blockchain by slayer
 • 29,370 points • 1,846 views
0 votes
1 answer

Can't install pyethereum module

Sep 27, 2018 in Blockchain by digger
 • 26,740 points • 1,146 views
0 votes
1 answer

How do I compile a piece of Solidity Code using eris' javascript?

Sep 27, 2018 in Blockchain by slayer
 • 29,370 points • 981 views
0 votes
1 answer

Getting error during “truffle migrate” for an ethereum contract on testrpc

Sep 27, 2018 in Blockchain by digger
 • 26,740 points • 708 views
0 votes
1 answer

How do I send ether from an EOA to a smart contract?

Sep 27, 2018 in Blockchain by slayer
 • 29,370 points • 1,745 views
+1 vote
1 answer

Deploy contract using solcjs

Sep 26, 2018 in Blockchain by digger
 • 26,740 points • 1,156 views
+1 vote
1 answer

Calling deployed smart contract from node.js

Sep 26, 2018 in Blockchain by slayer
 • 29,370 points • 4,220 views
+1 vote
1 answer

Solidity: Sending ERC20 Tokens

Sep 26, 2018 in Blockchain by digger
 • 26,740 points • 1,647 views
0 votes
1 answer

Solidity: How can I return a list of user-defined function?

Sep 26, 2018 in Blockchain by slayer
 • 29,370 points • 1,481 views
0 votes
1 answer

How can I get the same return value as solidity `abi.encodePacked` in Golang?

Sep 26, 2018 in Blockchain by digger
 • 26,740 points • 4,411 views
0 votes
1 answer

How connect library to smart contract from external resources?

Sep 26, 2018 in Blockchain by slayer
 • 29,370 points • 690 views
0 votes
1 answer

Is it possible to send eth to a contract through its constructor from another contract?

Sep 26, 2018 in Blockchain by digger
 • 26,740 points • 1,824 views
0 votes
1 answer

Testrpc Error: listen EADDRINUSE :::8545 on Mac

Sep 26, 2018 in Blockchain by slayer
 • 29,370 points • 1,075 views
0 votes
1 answer

Nethereum C# Unit Test GetTransactionCount

Sep 26, 2018 in Blockchain by digger
 • 26,740 points • 1,483 views
0 votes
1 answer

Error using EtherJS: this.provider.getTransactionCount is not a function

Sep 26, 2018 in Blockchain by slayer
 • 29,370 points • 2,714 views
+5 votes
1 answer

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

Sep 25, 2018 in Blockchain by slayer
 • 29,370 points • 1,068 views
0 votes
2 answers

Warning: Using contract member “balance” inherited from the address type is deprecated. Solidity

Sep 25, 2018 in Blockchain by digger
 • 26,740 points • 1,310 views
0 votes
3 answers

String conversion to Array in Solidity

Sep 25, 2018 in Blockchain by slayer
 • 29,370 points • 3,462 views
0 votes
1 answer

Cannot access web3 object with typescript and ethereum

Sep 25, 2018 in Blockchain by digger
 • 26,740 points • 3,011 views
0 votes
1 answer

Poloniex C# API - get trades

Sep 25, 2018 in Blockchain by slayer
 • 29,370 points • 1,631 views
0 votes
1 answer

How to set token price in solidity?

Sep 25, 2018 in Blockchain by digger
 • 26,740 points • 9,019 views
0 votes
1 answer

Ethereum call contract method that emits an event, from another contract

Sep 25, 2018 in Blockchain by slayer
 • 29,370 points • 2,393 views
0 votes
1 answer

eth.getTransactionReceipt returns null

Sep 25, 2018 in Blockchain by digger
 • 26,740 points • 2,259 views
0 votes
1 answer

Call contract methods with web3 from newly created account

Sep 25, 2018 in Blockchain by slayer
 • 29,370 points • 6,401 views
0 votes
1 answer

Not able send ether to my smart contract's address

Sep 25, 2018 in Blockchain by digger
 • 26,740 points • 1,713 views
0 votes
1 answer

Why Gas Used By Txn is different when invoking the same function in the same smart contract？

Sep 25, 2018 in Blockchain by sabby
 • 4,370 points • 1,128 views
0 votes
1 answer

How to detect if an ethereum address is an ERC20 token contract?

Sep 25, 2018 in Blockchain by sabby
 • 4,370 points • 7,578 views
+2 votes
1 answer

Composer playground - issue on RHEL

Sep 24, 2018 in Blockchain by Renu353
 • 190 points • 1,361 views
0 votes
1 answer

Getting the length of public array variable (getter)

Sep 24, 2018 in Blockchain by slayer
 • 29,370 points • 1,518 views
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