ethereum Questions
3
Solved
Using the python coinbase API-- The functions-- get_buy_price, get_sell_price, get_spot_price, get_historical_data, etc... all seem to return bitcoin prices only. Is there a way of querying Ethereu...
Sladen asked 27/3, 2017 at 4:21
2
We have a problem with contract redeploying. Each time when some logic is changed during new contract version deployment we are loosing all contract related data (which are stored in arrays, mappin...
Glossography asked 2/1, 2018 at 17:31
1
Solved
I have been attempting to deploy a contract using the Truffle framework, I have recently been testing these contracts on the development network.
My contract was very large and when I attempted t...
Stenger asked 19/12, 2017 at 18:29
1
currently i'm working on a ethereum dapp(voting), in my smart contract i have a function to fetch candidate list of type bytes32[] , on the java script side i'm not getting the values instead 0x on...
Californium asked 4/12, 2017 at 10:58
2
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I'm using the Ethereum api. I want to store the information from the api into a mysql table.
The address data looks like:
0x3f5ce5fbfe3e9af3971dd833d26ba9b5c936f0be
0x1d80982502f3bb75654df13aa32b...
5
Solved
I am trying to mine on a private network.
How does one go about creating a genesis block for a private network in frontier ethereum?
I have seen: https://blog.ethereum.org/2015/07/27/final-steps/...
Conducive asked 4/8, 2015 at 18:31
2
The problem arises when I want to test whether a string value is correct. Numbers are asserted correctly and don't return an error message when they are trying to be compiled. However, when I try t...
2
Solved
I am just starting with solidity. I have a function like so:
function get() constant returns (uint) {
return storedData;
}
What is the use of the constant keyword here? I understand that after...
1
Solved
I am using testrpc, web3 1.0 and solidity to build a simple Dapp, but I'm always getting this error and I can't find what is wrong. Please help.
My javascript file:
const Web3 = require('web3');
...
Viscous asked 7/8, 2017 at 3:31
2
Solved
In Ethereum Solidity, when changing an array length, I get "Value must be an lvalue". Why?
In Solidity, you can increase the size of an array to make room for a new member by using array.length++. But I'm getting an error:
Value must be an lvalue
Wanigan asked 21/11, 2015 at 2:41
2
Solved
I am trying to make a contract have a function that is capable of calling functions of another contract. The key part of my goal is that the contract should not be able to be deployed without any i...
Madalene asked 30/3, 2017 at 0:32
1
Solved
I am trying to get the length of array from another contact. How?
contract Lottery {
unint[] public bets;
}
contract CheckLottery {
function CheckLottery() {
Lottery.bets.length;
}
}
2
I just got chance to work on Ethereum, block-chain based platform. But I don't have a clear idea in which scenarios this is used, any real life use of this.Could anybody help me understand blockcha...
Boesch asked 17/3, 2017 at 12:25
1
Solved
I'm in the process of creating an Ethereum DApp. The DApp consists of users who have associated data like email, name, and a profile picture. I would like to store the contents of the user within I...
Juridical asked 28/2, 2017 at 22:38
1
Solved
I have a question when I use solidity to compile a simple contract.
It like that:
> web3.eth.getCompilers()
["Solidity"]
> source = "contract test { function multiply(uint a) returns(uint d)...
2
So, let us consider a typical trade finance process flow. Exporter deploys a contract that has conditions of the shipment and a hash is generated once the deployment is finished.
Questions:
1) W...
Risinger asked 7/2, 2017 at 3:26
2
Solved
Ethereum currently uses GPU-mining proof-of-work to perpetuate the blockchain, but I've read that the Ethereum foundation and developer team aims to move to proof-of-stake at some point in th...
Papageno asked 19/11, 2015 at 11:14
1
I make some contracts code with mapping data. When I first access data value, ethereum returns 0.
Is it specification of ethereum? In other word, Can I write a contract on the assumption that vari...
1
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The site https://ethstats.net displays statistics about the Ethereum network but I did not find a precise definition of each statistic and graph displayed. Is there somewhere I can get this informa...
Lanky asked 29/8, 2016 at 19:24
1
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They both seems to store files in a decentralized network. So what's the difference between them in terms of data structure and algorithms they use? And also what's the difference between the...
Grussing asked 10/8, 2016 at 17:8
1
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The Question:
Does anyone know a stable framework which can be used to create a blockchain application, creating a server/node, creating a miner, a wallet, a blockchain inspector, etc?
Such a fra...
Sail asked 16/5, 2016 at 13:31
1
Solved
How can I update the smartcontracts of my Truffle dapp which are deployed in the Ethereum blockchain?
Logographic asked 29/3, 2016 at 11:15
2
In Ethereum I opened the javascript console with "geth console" but I can not close it anymore.
I have tried ctrl-c, but it does not work.
Triazine asked 3/9, 2015 at 15:43
1
Solved
I'm looking for an explanation of gas usage in Ethereum. What is it, how is it calculated, and what value does it have?
Oconnor asked 19/11, 2015 at 11:1
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