Recent questions tagged smart-contract

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1 answer

Error when trying to deploy Ethereum smart contract using web3j

Oct 3, 2018 in Blockchain by digger
 • 26,740 points • 2,012 views
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1 answer

What happens to Ether in a smart contract after selfdestruct?

Oct 3, 2018 in Blockchain by slayer
 • 29,370 points • 1,671 views
0 votes
1 answer

Truffle migration error (test rpc is running)

Oct 3, 2018 in Blockchain by digger
 • 26,740 points • 1,076 views
0 votes
1 answer

How do display all the events logs from a smart contract?

Oct 3, 2018 in Blockchain by slayer
 • 29,370 points • 3,691 views
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1 answer

How do I initialize an array in a struct

Oct 1, 2018 in Blockchain by sabby
 • 4,370 points • 3,437 views
0 votes
2 answers

Modifiers in solidity

Oct 1, 2018 in Blockchain by digger
 • 26,740 points • 2,627 views
0 votes
1 answer

How to make Observable from callback?

Oct 1, 2018 in Blockchain by slayer
 • 29,370 points • 3,000 views
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1 answer

How to fix browser/IERC20.sol:4:53: Warning: This declaration shadows an existing declaration

Oct 1, 2018 in Blockchain by digger
 • 26,740 points • 1,880 views
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1 answer

Why is (startingBalance - endBalance) > (gasUsed * gasPrice) for an Ethereum transaction?

Oct 1, 2018 in Blockchain by slayer
 • 29,370 points • 1,287 views
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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 • 1,170 views
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1 answer

How to call function in one contract from another contract in private blockchain?

Oct 1, 2018 in Blockchain by slayer
 • 29,370 points • 1,289 views
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1 answer

Solidity mocha : address is not a contract error

Oct 1, 2018 in Blockchain by slayer
 • 29,370 points • 1,610 views
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1 answer

Can't call contract function in truffle console

Sep 28, 2018 in Blockchain by digger
 • 26,740 points • 3,596 views
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1 answer

Why estimateGas always returns null or zero?

Sep 28, 2018 in Blockchain by slayer
 • 29,370 points • 1,631 views
0 votes
1 answer

ethereum eth_sendTransaction via PHP curl

Sep 27, 2018 in Blockchain by digger
 • 26,740 points • 5,445 views
+1 vote
3 answers

Pass parameter as bytes32 to Solidity Smart Contract

Sep 27, 2018 in Blockchain by slayer
 • 29,370 points • 10,510 views
0 votes
1 answer

How to achieve simple OOP in Solidity?

Sep 27, 2018 in Blockchain by digger
 • 26,740 points • 1,247 views
0 votes
1 answer

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

Sep 27, 2018 in Blockchain by slayer
 • 29,370 points • 3,029 views
0 votes
1 answer

NPM cannot install “truffle” on Windows

Sep 27, 2018 in Blockchain by digger
 • 26,740 points • 4,720 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 • 1,248 views
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1 answer

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

Sep 27, 2018 in Blockchain by slayer
 • 29,370 points • 2,095 views
+1 vote
1 answer

Deploy contract using solcjs

Sep 26, 2018 in Blockchain by digger
 • 26,740 points • 1,406 views
+1 vote
1 answer

Calling deployed smart contract from node.js

Sep 26, 2018 in Blockchain by slayer
 • 29,370 points • 4,544 views
+1 vote
1 answer

Solidity: Sending ERC20 Tokens

Sep 26, 2018 in Blockchain by digger
 • 26,740 points • 1,997 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 • 1,784 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 • 4,833 views
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1 answer

How connect library to smart contract from external resources?

Sep 26, 2018 in Blockchain by slayer
 • 29,370 points • 965 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 • 2,113 views
0 votes
1 answer

Testrpc Error: listen EADDRINUSE :::8545 on Mac

Sep 26, 2018 in Blockchain by slayer
 • 29,370 points • 1,393 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 • 1,659 views
0 votes
3 answers

String conversion to Array in Solidity

Sep 25, 2018 in Blockchain by slayer
 • 29,370 points • 4,418 views
0 votes
1 answer

How to set token price in solidity?

Sep 25, 2018 in Blockchain by digger
 • 26,740 points • 9,495 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 • 2,816 views
0 votes
1 answer

Call contract methods with web3 from newly created account

Sep 25, 2018 in Blockchain by slayer
 • 29,370 points • 6,803 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 • 2,010 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 • 1,465 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 • 7,945 views
0 votes
1 answer

Getting the length of public array variable (getter)

Sep 24, 2018 in Blockchain by slayer
 • 29,370 points • 1,840 views
0 votes
4 answers

Unable to run truffle@2.1.2 migrate --network live. “Exceeds block gas limit”

Sep 24, 2018 in Blockchain by digger
 • 26,740 points • 2,524 views
0 votes
1 answer

How to manually create the instance of the contract in truffle?

Sep 24, 2018 in Blockchain by digger
 • 26,740 points • 3,294 views
0 votes
2 answers

Is it possible to modify a variable value from another contract?

Sep 24, 2018 in Blockchain by digger
 • 26,740 points • 4,902 views
+1 vote
3 answers

What is the pattern for handling throw on a Solidity contract in tests

Sep 24, 2018 in Blockchain by slayer
 • 29,370 points • 2,493 views
0 votes
3 answers

UnhandledPromiseRejectionWarning: Error: The contract code couldn't be stored, please check your gas limit

Sep 24, 2018 in Blockchain by digger
 • 26,740 points • 2,226 views
0 votes
2 answers

Truffle migrate Error after run testrpc

Sep 24, 2018 in Blockchain by slayer
 • 29,370 points • 1,258 views
0 votes
1 answer

Can't send transaction even if I use an example from official Ethereum webpage

Sep 21, 2018 in Blockchain by digger
 • 26,740 points • 1,744 views
0 votes
1 answer

Test ethereum Event Logs with truffle

Sep 21, 2018 in Blockchain by digger
 • 26,740 points • 2,444 views
0 votes
1 answer

Are there null like thing in solidity

Sep 21, 2018 in Blockchain by slayer
 • 29,370 points • 2,542 views
0 votes
1 answer

String concatenation in solidity?

Sep 21, 2018 in Blockchain by digger
 • 26,740 points • 3,728 views
0 votes
1 answer

Web3 1.0: What does `web3.eth.call(tx)` return for a contract creation?

Sep 17, 2018 in Blockchain by slayer
 • 29,370 points • 1,626 views
0 votes
1 answer

Solidity, javascript Wrong format: invalid address

Sep 17, 2018 in Blockchain by slayer
 • 29,370 points • 1,804 views
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