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1answer
331 views

What capacity is ethereum using recently?

What capacity is ethereum using recently? How many more people can use ethereum now? What is current blocksize, and what are all the data being broadcasted between nodes? I read that ethereum just ...
1
vote
1answer
709 views

Why won't rest of the PCI-e slots get detected after installing a graphic card in the x4 slot? [closed]

I am setting up a mining rig comprising of 5 graphic cards using this mainboard, Gigabyte P35-DS3P. It has the following number of PCI-e slots, as seen in the Gigabyte link: 1x x16 PCI-e slot 3x x1 ...
3
votes
1answer
314 views

How to help translating the wallet?

I'm interested in doing translations for my language. I've seen there are Ukraine and German translations available for mist. I'd like to begin, but don't know about any resources to start with. In ...
21
votes
1answer
3k views

What were the key assumptions and analyses that went into setting Ethereum's gas price?

Frontier was launched with a default gas price of 0.05e12 wei. In Homestead, the default was reduced to 0.02e12 wei. If this gas price is too low and operations on Ethereum are too cheap, for ...
5
votes
1answer
762 views

How can contracts be designed to use gas refunds?

A transaction may have some gas refunds, but such refunds can only be used within the transaction: the gas refund is not converted to ether and refunded to the sender's account. How can contracts be ...
3
votes
1answer
4k views

Software to measure power consumption of mining?

Does anyone know of any good software that will measure my PC's power consumption while I mine ethereum? I'm aware I could buy something to measure it on the socket, but free software is well, free.
3
votes
2answers
456 views

how to develop a multi-step game with the contract

I want to develop a multi step gambling game, my question is can several transactions be sent to the game contract separately(some first, some after) but all contribute to the result?
5
votes
1answer
526 views

Why is it that the Mist client can not display the transactions?

"Latest Transactions" not updating in Mist Wallet after sending Eth from Polo to my wallet. Balance is updating fine but can't see any transactions since 3/31.
4
votes
1answer
106 views

Is it conceivable to have a DApp that doesn't issue tokens?

I'm trying to nail down my explanations to people when they ask about Ethereum, and I'm trying to think of applications that wouldn't benefit from dispersing a token for some reason or another.
1
vote
0answers
46 views

newcomer here, any suggestions about developing a new smart contract [closed]

I want to develop a new smart contract as my graduation project, any suggestions about which client to use to develop a new contract?
3
votes
1answer
755 views

ethminer || Segmentation fault: 11 [duplicate]

I recently updated cpp-ethereum. I am now on ethminer version 1.2.3 when I start it to mine with ethminer --opencl-device 1 I get the folowing output. Getting work package... Segmentation fault: 11 ...
2
votes
1answer
102 views

How is the amount of gas required by an op code determined? [duplicate]

Is this proportional to time required to process? Is a high gas transaction more expensive for the miner to include in a block and does it add more to blockchain size than a low gas transaction?
5
votes
1answer
6k views

Mining wattage on Sapphire R9-390

got my first rig coming online. 6x Sapphire R9-390. I have 2x 750w power supply. Am I good? Does anyone have these cards and know the watt draw? Thank you :-)
7
votes
0answers
350 views

testrpc 2.0.0 - cannot find module 'memdown'

Trying to get testrpc (2.0.0) working on an ubuntu virtualbox, and getting this error when I run it: mowliv@u4:~$ testrpc module.js:341 throw err; ^ Error: Cannot find module 'memdown' ...
3
votes
1answer
1k views

Dangling hash node ref: too many open files

I'm running two supernodes with the geth client. At peak times they have 500-800 connections and handle around 16GB traffic per hour. This is how I run the node: geth --networkid "1" --identity "...
6
votes
1answer
1k views

How can i setup a web3 webservice that listens for events from my smart contract?

I have a smart contract that broadcasts events to web3 clients, upon each event being broadcast, the listening client makes a tx call to my contract. I would like to set up an 'always on' event ...
4
votes
3answers
1k views

Does EthereumJ (Java implementation of Ethereum) support JSON RPC API?

Looking at their github repository and searching through the source code, I could not find JSON RPC API, except the one for Whisper. Perhaps I did not look hard enough?
10
votes
1answer
2k views

do the contracts of ethereum have the access to the nonce of the blocks?

by this question I mean when we try to develop a gambling game contract we need some random input, can we just use the nonce data from some certain blocks? (I just start learning blockchain, I'm from ...
4
votes
1answer
1k views

MIX dapp IDE - how to run your dapp after deployment, error web3 is not defined

I managed to run a personal test chain. I deploy the Sample contract and everything is ok. Transactions included. Now how can I run the dapp? I go to the local package folder inside www I open the ...
5
votes
2answers
521 views

What are some of the most interesting single contracts on Ethereum?

What are some of the most interesting contracts on Ethereum, where a contract may not necessarily be a system or dApp, but a code snippet? A contract may not have a UI but could still be quite ...
1
vote
0answers
151 views

What are the preferred protocols to integrate external data sources & sinks with a BC network? [closed]

I'd like to trigger events and send data to external non-ethereum network applications. What is the preferred communication protocol and mechanism to use so as not to impact BC processing? My ...
3
votes
0answers
128 views

MIX issues on Windows

I've been involved with Ethereum for few months and am getting really excited about the functionalities it offers. Actually I'm trying to develop some contracts and deploy on the blockchain. I use ...
8
votes
1answer
678 views

How can I import accounts created by quorumwallet into Ethereum Wallet Mist?

I created an Ethereum address using quorumwallet.com. How can I manually import it to Mist Wallet so I can transact using Mist?
4
votes
2answers
2k views

Unlocking accounts for a back office app

I'm writing a "back office" app and need a way to unlock an account in an automated fashion. Yes, I know security of nodejs is questionable, but there are ways of solving this. blocking web3 from ...
4
votes
1answer
221 views

The third party api failure problem

I wanted to highlight a problem we all suffer from when using third party API's. Let's say you want to make an ethereum transaction. Normally the API will return a txid when the request is successful. ...
2
votes
1answer
350 views

sendTransaction from iPhone app

How do I call sendTransaction from within an iPhone app? I was thinking of running a web to Geth proxy where the iPhone app would call the Api exposed by the proxy which in turn calls my self hosted ...
9
votes
2answers
392 views

Is the entire blockchain (including the genesis block) stored forever?

Quick question: Is the complete blockchain for Ethereum stored for as long as the currency exists? If not, then what determines the amount of time the binary for a contract can exist to be called? If ...
9
votes
1answer
259 views

Why is web3 being proposed as a global variable in Mist? What's the reasoning?

I have heard that web3 is supposed to have global scope, something similar to document or window. What is the reasoning behind this architectural choice? Is this still an underlying assumption? In ...
2
votes
1answer
507 views

Sent Ether does not reach recipient on Testnet (Morden)

I'm trying to send Ether from an account of mine to a friend's account. I'm using the Ethereum Wallet application on Windows, my friend uses the Ethereum Wallet application on a Linux VM. The network ...
1
vote
0answers
24 views

Help with downloading the network [duplicate]

I'm trying to download the network in a different drive of my computer, not my C drive, because I don't have much space left on that one. I change the directory, H drive, while in the command prompt ...
4
votes
1answer
176 views

Missing File from Mix IDE Install Package for Windows

I tried to install the Mix IDE but MSVCR120.dll is missing from the install package and it won't run. Any ideas what else I could try?
4
votes
3answers
693 views

Can a smart contract code be used to generate a bitcoin public/private key pair address?

Seeing that a smart contract is just code. How would it be possible to make a smart contract generate a Bitcoin public/private key pair and send it to a user without anyone knowing the pair.
9
votes
3answers
676 views

How do smart locks make sure that they have access to an up-to-date version of the blockchain?

Smart locks like Slock.it are supposed to allow locks to be able to do things based on the blockchain state. Does that work with locks that don't have their own internet connection? If so, how does ...
5
votes
1answer
267 views

What is the Slock.it DAO for?

I'm basing this question on information from the whitepaper. The Slock.it DAO is meant to decentralize a trust. In their system, proposals are smart contracts DAO participants vote on. My issue is ...
4
votes
1answer
873 views

Who are the main developers of Ethereum?

Bitcoin has a handful of core developers like Gavin, Mike Hern, and etc that are the gatekeepers to implementing core features depending on community feedback. Who are the core devs in Ethereum and ...
5
votes
2answers
1k views

What are the roles of ETHDEV, ETHCORE and the Ethereum Foundation?

I am trying to understand the institutional setup of Ethereum. I could identify the following institutions: (1) The Ethereum foundation, (2) ETHDEV and (3) ETHCORE. The foundation (1) is apparently ...
13
votes
3answers
3k views

Multiple transactions from same address

I would like to create multiple transaction from the same address at the same time. Since every transaction needs nonce (tx count of the sender address) I can ask geth for the current count and create ...
4
votes
1answer
846 views

How to track a missing transaction on private testnet?

I'm having trouble getting a couple test transactions to show up in the destination account balance. Code is below. Appreciate someone pointing out whatever move I've made... Running geth as: geth --...
4
votes
1answer
1k views

How can I connect to ethereum with only a web browser to monitor a contract

AFAICT it requires a node such as geth to connect to ethereum to get or change contract state. I only need to get state, not change state, but I want to do it only from a web browser. I don't want ...
7
votes
1answer
819 views

Is it possible to sign transactions offline in Mist?

is this planned to be implemented? Would be great to be able to sign transactions securely on an air-gapped machine. I understand that IceBox has offline signing, but they don't support contracts/...
5
votes
3answers
908 views

Ether balance suddenly went to 0 and address not found on ether chain please help

My address is 0x9ac0e6b745bbd98eec2d900d5ee8144157d7fc1e and I had ether in it but it suddenly went down to 0 I have also never been able to find my address on ether chain.
4
votes
2answers
865 views

Does `throw` refund the ether value?

When a contract triggers a throw, the Solidity document states: Solidity will trigger an "invalid jump" and thus cause the EVM to revert all changes made to the state. In this case, what happens ...
5
votes
1answer
288 views

Contracts as First Class Citizens

I understand a contract being described as a top level abstraction, but what are some architectural and design advantages (and disadvantages) for developers in isolating their design classes into ...
9
votes
1answer
589 views

Is it convenient to use mappings as temporary KeyValue instances?

Consider the following contract that illustrates the problem. Here we have a dynamic array of mappings, add() is meant to add a fresh new mapping to the end of the array, return the value for mapping ...
11
votes
1answer
1k views

Is there a formal specification for the EVM?

The yellowpaper specifies the EVM, albeit in a fashion that favors formalism over readability: But there's no indication if this is up to date with the current state of the Ethereum ecosystem or not, ...
5
votes
1answer
879 views

Ethereum Difficulty History? Percentages not a chart

Is there any website that shows the Ethereum difficulty with percentage increase instead of just a chart ? I'm looking for something similar to https://bitcoinwisdom.com/bitcoin/difficulty : in the ...
9
votes
2answers
4k views

constant versus public in solidity functions

Using Mix, if I create a contract in the scenario with address A as a parameter, clicking on getConstant in the html below returns A as I would expected it, and I see a JS flagged transaction. If now ...
9
votes
2answers
2k views

What is the difference between a static node and a trusted node?

In the docs, static nodes are described as Geth supports a feature called static nodes if you have certain peers you always want to connect to. Static nodes are re-connected on disconnects. There ...
3
votes
1answer
513 views

What are the options that the web3.js solidity compiler passes to solc?

I've been using the following command to compile my contracts from CLI: solc ballot.sol --combined-json abi,asm,bin,interface > ballot.json However, the ballot.json file has a completely ...
5
votes
1answer
362 views

Catch on throw from contract

Is there any built-in way of catching throw clauses? For example, if I'm building a voting application where people must be given permission by the chairperson before voting, otherwise the contract ...

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