All Questions
228 questions
3
votes
2
answers
3k
views
Missing Eth after sending to contract
I tried following a tutorial on YT and my ETH has been missing. I keep on looking at the tos and froms but I can't seem to find where my ETH has been sent.
This is the created contract address
...
- 31
40
votes
2
answers
26k
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 ...
- 40.4k
16
votes
2
answers
12k
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 ...
- 40.4k
50
votes
2
answers
49k
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?
- 4,831
89
votes
6
answers
172k
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 ...
- 37.3k
40
votes
4
answers
165k
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? ...
- 1,943
92
votes
9
answers
121k
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 ...
- 2,790
76
votes
6
answers
277k
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 ...
- 761
21
votes
5
answers
13k
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?
- 4,831
28
votes
1
answer
24k
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 ...
- 475
19
votes
1
answer
5k
views
Can a contract with no payable function have ether?
The question in the title says it all.
To the best of my understanding, the only way to deposit ether into a contract is by calling a payable function, and set msg.value larger than 0 (and of course, ...
- 26.2k
5
votes
1
answer
2k
views
How to build an Ethereum hot wallet for an exchange
I’m developing an exchange.
When a new user register on website we will create new eth wallet for them.
When they deposit USDT on their wallet how can I transfer that USDT amount to another address (...
- 165
39
votes
6
answers
38k
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 ...
- 391
22
votes
3
answers
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 ...
12
votes
4
answers
1k
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?
- 4,756
79
votes
3
answers
87k
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 ...
- 851
16
votes
4
answers
13k
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 ...
- 311
6
votes
1
answer
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 ...
- 40.4k
2
votes
1
answer
3k
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 ...
- 183
9
votes
3
answers
7k
views
Convert an eth key to a geth key
I need to convert my eth key to a geth key.
eth put the key in %appdata%\roaming\Web3\keys, and I see it as a .json file. If I move that to the %appdata%\roaming\Ethereum\keystore directory, geth ...
- 93
8
votes
1
answer
605
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?
- 1,255
57
votes
4
answers
47k
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?
- 37.3k
18
votes
6
answers
38k
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 ...
- 191
17
votes
5
answers
3k
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 ...
- 1,898
16
votes
2
answers
115k
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.
- 881
6
votes
2
answers
6k
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 ...
6
votes
2
answers
7k
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 ...
- 61
37
votes
8
answers
78k
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:'...
- 531
17
votes
2
answers
28k
views
Does metamask store private key on server or anywhere else?
I have created my private key using myetherwallet using offline option.
Now Metamask allows us to import account by providing private key or Json File that has private key.
Does metamask store ...
- 333
10
votes
1
answer
15k
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 {
...
}
...
- 4,308
10
votes
3
answers
2k
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 ...
eth♦
- 86.5k
10
votes
6
answers
30k
views
Where can I find test-ether for the Kovan Test Network?
I have tried getting some using my github account but my account got flagged immediately and the program wasn't recognizing my account (Since it wasn't public due to being flagged). Are there any ...
7
votes
1
answer
3k
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 ...
- 397
7
votes
1
answer
10k
views
ETH sent to ETC address
I accidentally sent ALL my ETH on ETC address :(
6 months of mining gone :(
I sent from one exchange to fresh address on another exchange, but on ETC ...
Is there ANY way to track those coins?
I'm ...
7
votes
4
answers
7k
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 ...
- 33k
5
votes
2
answers
15k
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 (...
- 51
4
votes
2
answers
3k
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 ...
4
votes
1
answer
649
views
Can geth and eth share the same accounts and blockchain?
It appears when I have multiple ethereum clients installed, that they all have their own data, accounts and even their own copy of the blockchain.
Is it possible to share accounts and the blockchain ...
- 33k
4
votes
3
answers
3k
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, ...
- 143
2
votes
2
answers
2k
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 ...
- 123
0
votes
1
answer
949
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?
- 6,680
29
votes
2
answers
28k
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.
- 393
27
votes
2
answers
32k
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). ...
- 1,378
21
votes
5
answers
6k
views
How to spend ether from multiple accounts?
I would like to know how to send ether from multiple accounts. For example, suppose I have 3 accounts with 5 ether in each account, how do I send the total (15 ether) to an account in a single ...
- 427
11
votes
1
answer
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, ...
- 1,011
10
votes
1
answer
7k
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 ...
- 2,426
9
votes
1
answer
1k
views
How does EIP-1559 make Ethereum fees better?
I have a few questions that are mostly related to each other.
I don't understand how EIP-1559 makes it a better way than the current one about fees. Since EIP-1559 brings priority fees and miners ...
- 1,185
6
votes
1
answer
618
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 ...
- 931
4
votes
1
answer
529
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; ...
- 8,076
4
votes
2
answers
3k
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: ...
- 201