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Questions tagged [ethereum]

Questions about Ethereum are off topic. A blockchain-based "smart contract" system with a Turing-complete contract programming language. Questions about Ethereum should be asked on the dedicated Ethereum site: https://ethereum.stackexchange.com.

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908 views

Can Ethereum support compressed secp256k1 public keys to compute Keccak addresses? [closed]

Starting from a private key, a working functional example provides details for how an Ethereum address can be calculated from an uncompressed secp256k1 elliptic curve public key. This functional ...
3
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1answer
97 views

I tried to use bitcoin to buy ethereum and failed, what will happen now?

I tried to use some at the shifty exchange in the ethereum app, just for research. I sent money to the provided payment adress, but I think I included a to small fee. My payment is now uncofirmed and ...
6
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3answers
11k views

Is there a way to access Ethereum Smart Contract's variables by name in JavaScript?

Say I have a simple smart contract: contract Simple { string32 message; function Simple() { message = "Hello world!"; } } How can I easily access the message variable by name in ...
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2answers
1k views

How does Ethereum domain registration works?

I am wondering how does the Ethereum domain registration works? From what I can see in the whitepaper, I know there is account-specific data storage, but I don't know if that would be the ideal way to ...
11
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1answer
614 views

How does Ethereum achieve consensus?

It appears that Ethereum will start out with PoW and switch to PoS later. If I remember correctly, the block interval is planned to be fairly short in Ethereum. How does Ethereum manage to achieve ...
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0answers
587 views

What are realistic expectations for an ethereum miner on AWS? [closed]

I've configured the large (8x) GPU image on AWS at 2.60/hour. I ran it goes few hours after setup and mined nothing. This was my first foray into mining. Does this size instance give me a ...
1
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0answers
481 views

eth says I have a balance of 35 ether - etherchain can't find my address [closed]

In the ethconsole I get the following: > web3.fromWei(web3.eth.getBalance(web3.eth.coinbase), "ether") 35' When I run web3.eth.coinbase and enter the resulting 0x00f24... address into https://www....
2
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1answer
252 views

Withdrawing Ether from Cryptsy to geth

I am trying to withdraw Ethers from Cryptsy to geth account. Cryptsy says address, where I enter my account id, is invalid. Do I need to create a separate addresses besides running geth account new to ...
0
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1answer
321 views

Are there Ethereum API wrappers? [closed]

I'm looking into developing some Go software on Ethereum and I'm wondering - are there any API wrappers around for Ethereum (something like BTCSuite's BTCRPCClient is for Bitcoin)? I know there is a ...
5
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1answer
1k views

Is Ethereum essentially Bitcoin with Turing-complete Script?

Is Ethereum essentially Bitcoin with a Turing-complete scripting language and, if I understand correctly, where the script to be executed (not its hash) is placed in the Ethereum blockchain? If so, ...
2
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0answers
115 views

eth says that I just mined something: now what? [closed]

I'm using eth to GPU mine for Ethereum. After running for 10 minutes, it said: i 23:58:32|gpuminer0 Mined #7a877124… (parent: #d4e56740… ) If this were Bitcoin, I'd go check it out on ...
2
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3answers
362 views

Ethereum - contract

I'm not sure whether people answers question on Ethereum here as well but just in case... Once my smart contract is active on the Ethereum, what prevents me from modifying the contract for my own ...
2
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0answers
63 views

Is it cheaper to store data across multiple instances of the same contract? [closed]

From what I understand, code is deduplicated on the Ethereum blockchain by storing pointers in new blocks to blocks containing code that is being reused in the new block. If that's the case: Is it ...
6
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4answers
5k views

Ethereum vs NXT Comparison Chart?

Where can I find a comparison chart between these crypto 2.0 currencies like NXT and ethereum? What are some of the major advantages of each of these coins in relation to one another?
3
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1answer
778 views

Ethereum - how is the output of a contract computation verified?

This may be as simple as a pointer to some place in the docs I've missed, but how/where is the output of a contract's computation checked, or assured against a malicious miner with an intentionally ...
3
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0answers
484 views

blockchain - Anti-virus service

I hope this is the right place to ask a question on how does block-chain help this theoretical requirement. I have also asked this question on SO; so far, no response. And, Ethereum SE is still in ...
1
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1answer
236 views

How to start programming using Ethereum?

I'd like to listen opinions of people that have created already their own working contract. What have you read at the beginning and then? What was the most powerful source that helped you understand ...
5
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2answers
430 views

Does Ethereum support the features necessary to create the Lightning Network?

The Lightning Network of micropayment channels is a concept first conceived by Joseph Poon and Thaddeus Dryja. It requires a few features of bitcoin that are not available yet. OP_CHECKLOCKTIMEVERIFY ...
4
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1answer
433 views

Why is a short blocktime considered to be unsafe?

I've heard a couple of times "a shorter blocktime is unsafe," (first about Litecoin and now Ethereum) but never understood why. Is it the higher probability of a fork? Why do some people consider a ...
2
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2answers
397 views

How to delete an element of an array in an Ethereum contract?

I am wondering - is it possible to delete a single element of an array in Ethereum without having to create a new array and copying the entire array? Reading some of the documentation, I can't seem to ...
2
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1answer
685 views

In Ethereum smart contracts is it cheaper to keep all the data, or delete old data?

As I understand, Ethereum smart contracts can store data internally. I am wondering - is it cheaper for a smart contract to keep all of its data forever if it is keeping the data for any length of ...
3
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2answers
566 views

Who pays the fees for transactions initiated by a smart contract in Ethereum?

I am wondering who pays the fees for transactions initiated by a smart contract in Ethereum? For example, if I have a contract that simply forwards any payment made into it to someone else, does the ...
4
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2answers
588 views

Can an Ethereum contract be updated without having to be re-submitted?

I am wondering - can an Ethereum contract be updated without having to be re-submitted? Say, if I find a bug in my contract, can I fix it without having to create a new contract and making my ...
1
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1answer
361 views

What data is available to Ethereum smart contracts?

I'm wondering - what data is available to the Ethereum smart contracts? I stumbled upon some tutorials on how to write the contracts that give some indication as to a few examples of the data is ...
4
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3answers
491 views

Can Bitcoin incorporate the scripting protocols of Ethereum without a fork?

I am curious if the Bitcoin protocol can incorporate Turing complete scripting capabilities without forking the block chain. I ask this because I understand the ability to create contracts digitally ...
0
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1answer
130 views

Decentralized product inventory (instead of simple orderbook)

I am thinking of creating a decentralized market place with public bidding. AS far as I have researched all cryptocurrencies and such only offer public ledgers with simple orderbooks. The only data ...
6
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1answer
406 views

What actually happens in a basic DAO in ethereum?

I've had a look at the white paper but I fail to understand exactly what is happening on the code shown on the page. As far as I understand this example manages shareholders. But, is it possible to ...