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Questions tagged [ether]

Ether (ETH) is the main internal crypto-fuel of Ethereum and is used to pay transaction fees.

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39
votes
2answers
24k views

How do I convert my The DAO tokens into ethers using the withdrawal contract after the hard fork?

The DAO contract was attacked on 17th June 2016 where the attacker drained about USD 50 million worth of ethers using a recursive call vulnerability in The DAO contract code. The attacker drained ...
15
votes
2answers
11k views

How do I get a refund for the amount I paid in excess of 1 ether to 100 The DAO tokens

Anyone who bought DAOs in the last two weeks of The DAO crowdfunding phase paid more than 1 ether (ETH) per 100 The DAO tokens (DAO). The ETH amount in excess of 1 ETH per 100 DAOs was stored in The ...
49
votes
2answers
46k views

How do I backup my ether accounts?

I want to backup my accounts onto a USB or other external device for safe-keeping. How can I do that?
38
votes
4answers
128k views

Is CPU mining even worth the Ether?

I would like to start mining Ether, but my GPU isn't the greatest and I don't really want to spend the money on a dedicated rig. Is mining from my CPU (in a Linux environment) still worth the Ether? ...
58
votes
8answers
42k views

How can I check if an Ethereum address is valid?

I've read many times that you should never input an address by hand unless you want to accidentally send Ether into no-mans-land. I'd like to know what those checksums might be. Is there a way to tell ...
73
votes
6answers
272k views

How do I buy Ethereum with USD?

I am a complete noob at investing. I have never bought stock or invested in anything before but I have $300 I would like to turn into Ethereum. Could someone please tell me step by step how to ...
79
votes
6answers
159k views

What is the total supply of Ether?

In Bitcoin, the total supply is capped at 21 million BTC. Is the total supply of Ether capped? How much will be mined before the Proof of Stake (POS) transition, and how will POS affect the issuance ...
21
votes
3answers
4k views

TheDAO hack FAQ: How did the attack happen on 17 June 2016?

Can anyone explain that how the DAO attack happened? Vitalik Buterin explained here that it was performed by splitting a DAO from the main DAO but calling the split function recursively. We know that ...
20
votes
5answers
10k views

How do I import my presale wallet?

I purchased ether during the presale. Is there an easy way to import those ether and start using them?
10
votes
4answers
971 views

What is ether? How is it different from other tokens such as bitcoin?

What is ether? How does it differ from past tokens such as bitcoin and litecoin? What are all the usages of ether?
21
votes
3answers
18k views

How is the Mining Difficulty calculated on Ethereum?

Having read various pieces of documentation, it's still not completely clear to me what dictates the difficulty rise, and how Ethereum difficulty levels differ to Bitcoin. In the past week ...
36
votes
6answers
27k views

How to get ether on public testnet?

I am a newbee to Ethereum and doing some research. I have installed the Ethereum Wallet app and synchronized the testnet. However, to deploy my first contract in testnet, it requires some Ether, so ...
11
votes
3answers
4k views

are there “public” ethereum nodes? or any recommendations on hosting solutions?

I've always ran apps on Heroku. Just developed a smart contract and I need to check the blockchain from the app. Are there public nodes I can connect to to get the info I need to show on my app? If ...
5
votes
1answer
4k views

How do I get a refund for my The DAO tokens that was split into a child DAO?

The DAO token holders that split away from the main The DAO into a child DAO will have moved the tokens (DAO) and the corresponding ethers (ETH) into the child DAO. As these DAO token holders have a ...
38
votes
2answers
28k views

Is Ethereum wallet address case sensitive?

I sent some amount of ETH to a wallet. I checked the wallets balance on ether chain. I entered the address in the search field and noticed both lowercase and uppercase versions of the address seemed ...
8
votes
1answer
468 views

Is there any way to determine how long it took for the DAO attacker to deploy the attack?

Yeah, we heard that the DAO has been attacked. I am so curious about how long it took for the attacker to perform the whole transactions?
16
votes
2answers
92k views

How fast should be an internet connection to mine ETH?

How fast should be an internet connection to mine ethereum and don't have connection issues? What about ping? And, how many GB of data would get downloaded over a month period? I have a 250GB limit.
6
votes
2answers
6k views

How to apply pyethrecover.py on v3 .json/transfor v3 .json to .v1

I'm trying to get pyethrecover.py running via Python on one of my .json files that were created by Ethereum-wallet for Mac. It seems that my .json file is v3 and the pyethrecover.py only works for v1 ...
6
votes
2answers
5k views

How to create a token smart contract that sends tokens after recieving payment in ether?

Hey everyone I am launching an ICO. I need to create a smart contract that holds a certain amount of tokens that I created. Then when ether is sent to the smart contract address for my token. It will ...
15
votes
4answers
1k views

How to increase my privacy on Ether accounts?

What would be the best way, if any, that one could change their address/account in order to make themselves unknown or hard to identify by people they traded with? More specifically, if I send ETH to ...
14
votes
4answers
4k views

Where can I buy Ether?

Where are the best places to buy ether with the least resistance and lowest fees? Is there something like local bitcoin, but for ether?
7
votes
4answers
6k views

How to withdraw Ether from The DAO?

As I understand, everyone who invested in The Dao recieves tokens which enable to propose and vote in the DAO. And anyone holding tokens could anytime withdraw the Ether invested if he is not ...
4
votes
2answers
2k views

How to unlockAccount account using private key instead of password

I am working with https://github.com/ethereum/wiki/wiki/JSON-RPC api + curl . And implementing custom api using this php library: https://github.com/Achse/geth-jsonrpc-php-client below method is ...
2
votes
1answer
1k views

How can I create a new public blockchain cloned from Ethereum?

Basically I know how to create a private blockchain, or Testnet, But how would you go about creating a complete fork of Ethereum, while changing the name of Ethereum to something custom ? For ...
3
votes
3answers
2k views

What is the purpose of Testnet?

I'm just getting into cryptocurrencies so forgive me if there are some basics I am missing out on. I have got a bitcoin account up and running and will soon be buying a few just to test things out, ...
0
votes
1answer
576 views

Sent transaction between ETH and ETC accounts

Halp! I sent a transaction between an ETH account and an ETC account by accident! How can I recover the ether?
24
votes
2answers
27k views

Ether Historical Prices

I am looking for historical datasets of the price of Ether. Similar to Bitcoin closing market price on blockchain.info or Coindesk OHLC dataset. Datasets in raw form are preferred (.json or .csv). ...
23
votes
2answers
27k views

What is Ethereum's inflation rate? (how quickly will new ether be created)

It seems like the answer is still in flux, but it would be nice to have a single answer to this question that we can update over time.
10
votes
3answers
1k views

How would stablecoins work on Ethereum?

The idea of a stablecoin in Ethereum is to create a token that is pegged to the price of say $1 USD. What are the main ways of achieving a stable cryptocurrency? What DApps are implementing them and ...
11
votes
1answer
2k views

Is it possible to create ICO crowdsale seamlessly accepting multiple assets?

Most of the ICO crowdsales accept ETH only. Some accept BTC. Very few accept other assets. I was thinking about creating crowdsale that would accept as many assets as possible. While creating, ...
7
votes
1answer
8k views

What's a fallback function when using address.send(…)?

This code is in my contract: contract A { address x = 0x1234...; x.send(10); } What would fallback function in the contract at address 0x1234... look like? contract B { ... } ...
3
votes
1answer
1k views

Add user details to smart Contract

What is the best way to store users data on smart contract? Suppose we have n number of users and we want to store each username and his other details, should we have to create a smart contract ...
12
votes
5answers
16k views

send ethers from one contract to another

I am wondering how can I have ethers in my contract. I have 2 contracts associated with different accounts. I want to send ethers from one contract to another but how do I have ethers in my contract ...
5
votes
1answer
530 views

Contract 'throw' - ether sent by the contract also reverted?

If a contract throws a exception (using 'throw') is any ether sent by the contract to other contracts or external accounts also reverted? I understand that any contract callers have the ether value ...
2
votes
2answers
5k views

What is the size (bytes) of a simple Ethereum transaction versus a Bitcoin transaction?

Alice owns an empty Ethereum wallet. Receives 1 ETH then sends 1 ETH to Bob. Alice owns an empty Bitcoin wallet. Receives 1 BTC then sends 1 BTC to Bob. What are the transaction sizes in bytes (...
20
votes
6answers
29k views

Insufficient funds for gas * price + value

Sending Address has over 1 Eth in current Balance. Using the Geth console, I can send many transactions of any amount less than .033 eth.sendTransaction({to:'...
6
votes
1answer
2k views

Passing ether with call to Solidity function

I have deployed a contract to testnet which appears to function. I have a function named contribute which gets the ether from the msg.value. The function is below and doesn't take any arguments. I ...
4
votes
2answers
2k views

What gives ether it's intrinsic value? [duplicate]

Trying to understand how ethereum and blockchain work. I keep hearing that miners are needed to do the computations to unlock a block (don't know if that's the correct term). My question is this: ...
4
votes
1answer
353 views

Buy function not working with solidity 0.4.2

I don't know if there is any such change in latest Solidity version that is preventing execution of this function: function buy() returns (uint amount){ amount = msg.value / buyPrice; ...
1
vote
2answers
1k views

Which accounts contributed to The DAO's extraBalance account?

Anyone who bought DAOs in the last two weeks of The DAO crowdfunding phase paid more than 1 ether (ETH) per 100 The DAO tokens (DAO). The ETH amount in excess of 1 ETH per 100 DAOs was stored in The ...
45
votes
4answers
34k views

The Ether denominations are called Finney, Szabo, and Wei. What/who are these named after?

This was recently asked on Reddit. To expand, who are Finney, Szabo, and Wei, and what did they do/contribute to the project that warranted being awarded denominations?
9
votes
1answer
2k views

ICO crypto-currencies accepted during the sale: ETH, BTC, or even fiat?

ICO contracts are meant to accept Ether as payin for the tokens sold, for example https://cartaxi.io/pre-ico or https://www.herocoin.io/ But there are a lot of ICOs running on Ethereum that accept ...
20
votes
1answer
61k views

Gas price in ETH unit

I am wondering if there's a website that provides the price of the standard gas limit (21000 Gas, transaction cost for sending ETH) in ETH unit. I checked Ether.Fund site, but it provides the gas ...
7
votes
3answers
25k views

Sent ether from wallet to bittrex, 12 hours later no balance on bittrex [closed]

So I made an account on bittrex and I created a hex address so I could transfer over my ether, I went into my wallet and sent 0.1 ether to bittrex, 12 hours later my bittrex account still shows a 0 ...
8
votes
3answers
7k views

What are digital tokens? How are various tokens generated on Ethereum?

I've heard in various talks, Ethereum can generate any token (besides ether), representing anything from bitcoin (through btc-relay), litecoin, dogecoin, digital assets, shares, ownership ...
4
votes
2answers
3k views

How can a smart contract run when receiving ether directly, not through a function?

I have a smart contract with a payable bet() function. When someone sends 1 ether to the bet function, the contract is executed. I'd like the contract to run the same code when someone sends ether to ...
2
votes
2answers
847 views

How to accept bitcoin and transfer tokens from smart contract to sender ethereum address

I have created sample tokens Smart Contract with the payable feature/constructor, if someone pay from their Ethereum address to Smart Contract will get instant token into their Ethereum address. But ...
13
votes
6answers
12k views

How to create a temporary account for testnet with funds?

I'm a newbie in using the ethereum wallet. After I completely installed and downloaded data for the testnet I create a new account but my new account has nothing (0.00 Eth). It lead to I can't do ...
12
votes
3answers
11k views

Is there any Ether mixer / tumbler available?

Quick checking around there are exactly two references to an Ether Mixer - this non functioning and here (r/ethereum) 24 days ago. Unless I am missing something how can I hide the source of an ETH ...
9
votes
2answers
2k views

Is it possible to send transactions to multiple recipients?

In other blockchain based platforms, it's possible to send transactions to multiple recipients. For instance, if I want to send 13 ETH to Alice and 7 ETH to Bob, Bitcoin has sendmany. Is it possible ...