Recent questions tagged ethereum

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What is the difference between creating a new solidity contract with and without the `new` keyword?

Oct 8, 2018 in Blockchain by digger
 • 26,740 points • 1,171 views
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Ethereum, web3, Error: invalid argument 0: cannot unmarshal non-string as hex data, when I call a contract

Oct 8, 2018 in Blockchain by digger
 • 26,740 points • 1,965 views
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Solidity different token price

Oct 8, 2018 in Blockchain by digger
 • 26,740 points • 872 views
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Sending hash in function parameter

Oct 8, 2018 in Blockchain by digger
 • 26,740 points • 779 views
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Contract deployment is raising gas issue while transaction and issue vary on various networksbl

Oct 3, 2018 in Blockchain by digger
 • 26,740 points • 700 views
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Error when Installing Ethereum: Package 'ethereum' has no installation candidate

Oct 3, 2018 in Blockchain by slayer
 • 29,370 points • 814 views
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Web is not injected by metamask

Oct 3, 2018 in Blockchain by digger
 • 26,740 points • 943 views
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Truffle migrate fails due to missing function, but it exists in node_modules

Oct 3, 2018 in Blockchain by slayer
 • 29,370 points • 2,010 views
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Access variables through auto-generated getters from a different contract

Oct 3, 2018 in Blockchain by digger
 • 26,740 points • 507 views
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Handling UI when a trasaction is in pending (MetaMask)

Oct 3, 2018 in Blockchain by slayer
 • 29,370 points • 932 views
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Error when trying to deploy Ethereum smart contract using web3j

Oct 3, 2018 in Blockchain by digger
 • 26,740 points • 1,577 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 • 1,018 views
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Truffle migration error (test rpc is running)

Oct 3, 2018 in Blockchain by digger
 • 26,740 points • 756 views
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How do display all the events logs from a smart contract?

Oct 3, 2018 in Blockchain by slayer
 • 29,370 points • 3,239 views
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How do I initialize an array in a struct

Oct 1, 2018 in Blockchain by sabby
 • 4,370 points • 3,009 views
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2 answers

Modifiers in solidity

Oct 1, 2018 in Blockchain by digger
 • 26,740 points • 2,063 views
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How to make Observable from callback?

Oct 1, 2018 in Blockchain by slayer
 • 29,370 points • 2,640 views
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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 • 1,440 views
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Why is (startingBalance - endBalance) > (gasUsed * gasPrice) for an Ethereum transaction?

Oct 1, 2018 in Blockchain by slayer
 • 29,370 points • 858 views
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Web3j: Writing operations on a contract always throw “java.lang.ArrayIndexOutOfBoundsException”

Oct 1, 2018 in Blockchain by digger
 • 26,740 points • 653 views
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1 answer

Send all Tokens and Eth to a Address automatically

Oct 1, 2018 in Blockchain by slayer
 • 29,370 points • 4,284 views
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Ethereum client-go RPC response 403 “invalid host specified”

Oct 1, 2018 in Blockchain by digger
 • 26,740 points • 1,983 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 • 861 views
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web3.eth.sendSignedTransaction() always return “Returned error: nonce too low”

Oct 1, 2018 in Blockchain by digger
 • 26,740 points • 6,026 views
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Solidity mocha : address is not a contract error

Oct 1, 2018 in Blockchain by slayer
 • 29,370 points • 1,062 views
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1 answer

Invalid method parameters for eth_sendTransaction

Sep 28, 2018 in Blockchain by slayer
 • 29,370 points • 1,854 views
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1 answer

How to run Meteor insert within a Fiber?

Sep 28, 2018 in Blockchain by digger
 • 26,740 points • 786 views
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1 answer

Etheruem: Pyethereum Error

Sep 28, 2018 in Blockchain by slayer
 • 29,370 points • 458 views
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1 answer

Uncaught ReferenceError: web3 is not defined at window.onload

Sep 28, 2018 in Blockchain by digger
 • 26,740 points • 2,393 views
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How are the ethers sent to smart contract in the IBM example?

Sep 28, 2018 in Blockchain by slayer
 • 29,370 points • 542 views
0 votes
1 answer

Can't call contract function in truffle console

Sep 28, 2018 in Blockchain by digger
 • 26,740 points • 3,094 views
0 votes
1 answer

Why estimateGas always returns null or zero?

Sep 28, 2018 in Blockchain by slayer
 • 29,370 points • 1,288 views
0 votes
1 answer

ethereum eth_sendTransaction via PHP curl

Sep 27, 2018 in Blockchain by digger
 • 26,740 points • 4,938 views
+1 vote
3 answers

Pass parameter as bytes32 to Solidity Smart Contract

Sep 27, 2018 in Blockchain by slayer
 • 29,370 points • 9,706 views
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1 answer

How to achieve simple OOP in Solidity?

Sep 27, 2018 in Blockchain by digger
 • 26,740 points • 893 views
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1 answer

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

Sep 27, 2018 in Blockchain by slayer
 • 29,370 points • 2,460 views
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1 answer

NPM cannot install “truffle” on Windows

Sep 27, 2018 in Blockchain by digger
 • 26,740 points • 4,125 views
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3 answers

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

Sep 27, 2018 in Blockchain by slayer
 • 29,370 points • 1,573 views
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1 answer

Can't install pyethereum module

Sep 27, 2018 in Blockchain by digger
 • 26,740 points • 999 views
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1 answer

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

Sep 27, 2018 in Blockchain by slayer
 • 29,370 points • 851 views
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Getting error during “truffle migrate” for an ethereum contract on testrpc

Sep 27, 2018 in Blockchain by digger
 • 26,740 points • 612 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 • 1,574 views
+1 vote
1 answer

Deploy contract using solcjs

Sep 26, 2018 in Blockchain by digger
 • 26,740 points • 1,024 views
+1 vote
1 answer

Calling deployed smart contract from node.js

Sep 26, 2018 in Blockchain by slayer
 • 29,370 points • 3,998 views
+1 vote
1 answer

Solidity: Sending ERC20 Tokens

Sep 26, 2018 in Blockchain by digger
 • 26,740 points • 1,557 views
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1 answer

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

Sep 26, 2018 in Blockchain by slayer
 • 29,370 points • 1,363 views
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How can I get the same return value as solidity `abi.encodePacked` in Golang?

Sep 26, 2018 in Blockchain by digger
 • 26,740 points • 4,235 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 • 592 views
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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 • 1,715 views
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1 answer

Testrpc Error: listen EADDRINUSE :::8545 on Mac

Sep 26, 2018 in Blockchain by slayer
 • 29,370 points • 938 views
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