Linked Questions
15 questions linked to/from What is a replay attack?
21
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3
answers
7k
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How does the Ethereum ETH accounting system work and prevent double-spends?
In Bitcoin, the BTC accounting system is based on UTXOs (Unspent Transaction Outputs), which prevents the same BTC from being spent multiple times. I heard that Ethereum has a simpler account balance ...
- 2,530
11
votes
3
answers
3k
views
How to prevent a replay attack between two competing chains?
After the recent hardfork we have a winning chain and a much shorter losing chain left. However, if you are pro or agains the fork, you could still mine and use one chain or the other.
Now, there is ...
- 32.2k
6
votes
2
answers
6k
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I've sent ether from testnet to mainnet but didn't receive anything. Why?
A few days ago I made a transaction at an address known to me (tx made from testnet to global main net). The transaction took place and received over 6 confirmations. The next day this transaction was ...
- 155
6
votes
4
answers
768
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How to withdraw from live.ether.camp?
So last week I went on live.ether.camp and clicked the "Get Address" button then entered a seed phrase which I saved and still know.
Then it told me my address was ready. I then bought 78 ethers on ...
- 183
4
votes
2
answers
2k
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What is the difference between account nonce and block nonce?
Block and accounts both use a value called "nonce" but they seem to represent something very different.
For account I understand that the nonce is an integer quantity indicating the number of ...
- 6,643
4
votes
1
answer
1k
views
Transaction receipts, blocks and confirmations
In Bitcoin, there is a best practice to wait between three to six block confirmations before accepting an transaction. This is to avoid double spending. Are there similar rules of thumb in Ethereum?
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- 19.8k
2
votes
1
answer
3k
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EIP155. How chainId works?
I know signed transaction got v=37.
now I am wondering how 'v=37' is used to check that the transaction is right one.
nodes check v of every transaction they received?
- 23
6
votes
1
answer
700
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Post the DAO-fork, is there a double-spending problem?
If an account had ETH before the DAO-fork does the ETH now not exist on both the ETH and the ETC chains?
A Poloniex notice says "All users who had an Ethereum balance at the moment of the fork now ...
- 1,635
2
votes
1
answer
1k
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Ethereum Hard Fork: what happened to legacy Ether?
I currently run Forked Ethereum via Parity. I'm assuming my Ether from before the fork is available on this chain. However, does it also still exist on the Ethereum Classic chain? I tried researching ...
- 1,650
4
votes
1
answer
1k
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Blockchain sync lost after restarting geth?
I'm new to mining ethereum so this may be a very basic question.
I ran geth in attempt to sync the blockchain on my machine as follows
geth --rpc --fast --cache=2048
After letting it spin for about ...
- 43
0
votes
1
answer
598
views
“txHash: undefined” error using web3.js
Can anyone help me fix this problem?
I get 'txHash: undefined' error in terminal
var Tx = require('ethereumjs-tx').Transaction
const Web3 = require('web3')
const web3 = new Web3('https://ropsten....
- 3
3
votes
2
answers
184
views
What various components are needed to trigger an Ethereum contract?
From what I understand, you must provide Ether so there's an incentive for miners to run the contract, but what else is provided?
Must you sign cryptographically (to make sure an unrelated party ...
- 361
2
votes
1
answer
208
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How does Ethereum know that I have enough ETH to spend?
Ethereum uses account-based model. It means that if account A has 50 ETH and sends 10 ETH to account B, transaction will look like "send 10 ETH from A to B" (no inputs and outputs as in UTXO).
With ...
- 189
3
votes
1
answer
124
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Is it bad security to use the same private keys and/or keyfiles across production, testnet, and dev?
I'd like to understand the security implications of re-using keys across a privatenet, the public testnet, and the production network. If this is bad, why so? Are there advantages or disadvantages to ...
- 85
3
votes
1
answer
100
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Ethereum Mist wallet 0.8.0 won't receive any payments anymore
Mist would not receive any payments. I have not updated after 0.8.0. Is the reason because I have not done anything to choose which chain I will use?
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