Linked Questions

0
votes
2answers
86 views

ETH Json RPC output [duplicate]

Looking at the output of https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_getblockbyhash Does anyone know what do the "mixHash" and "extraData" field mean? and what is the Unit of gasLimit and ...
13
votes
3answers
20k views

How to set up a Private network and connect peers in geth?

I am trying to setup a private network and trying to connect peers. Currently I'm trying it on my laptop and desktop (both of them are connected to different internet). I run the below command in ...
17
votes
1answer
4k views

The meaning/specification of “config” in genesis.json

As I tried to search from Google, there are some genesis.json example files to customize the parameter of genesis block in Ethereum private blockchain. In the file, there is a part called "config" "...
5
votes
2answers
8k views

How to increase gas limit in block using geth?

When I try to execute methods from my smart-contract, I get limeted by gas limit in block and cant do anything. How to change gas limit in block?
4
votes
2answers
2k views

callback contain no result Gas required exceeds limit

I am trying to run a function with Remix web compiler on a contract in my private chain. Here is my contract and I am trying to run the function changeVaccinHistory: contract PatientObjects { ...
3
votes
1answer
3k views

How to Set Gas Price in Private Blockchain?

I admit that I don't understand Gas at all. But I think it is basically the currency which dapps use to interact with each other and the blockchain. Yes? If you're creating a custom/private network,...
4
votes
1answer
2k views

How to add more Ether on a private blockchain

In geth 1.5 the --genesis option has been removed. What do I use instead to add ether to my account?
4
votes
1answer
771 views

What do the parameters in the Ropsten genesis file mean?

Here's a snippet of Geth's Ropsten genesis: "config": { "chainId": 3, "homesteadBlock":0, "eip150Block":0, "eip155Block":10, "eip158Block":10, "eip160Block":10 } ...
1
vote
3answers
1k views

Mining not working in ethereum private net

I was trying to enable mining over my private network but it won't start. My Understanding so far about mining Mining is used to mine new block , to confirm transaction and also to generate new ...
2
votes
1answer
1k views

What does the extraData field of a block represent?

I am trying to save some data into a block. The extraData field has a constant value since block 1. Also where does the data parameter of sendTransaction() function get stored?
4
votes
1answer
280 views

What replay attack protections does Ropsten provide?

I understand the Ropsten testnet was partly necessary because of some broken replay-protection measures on Morden. So what's different for Ropsten? Is the nonce simply incremented by a smaller ...
2
votes
0answers
872 views

Fatal Error while initializing Node from Custom genesis file : “cannot unmarshal hex string of odd length”

I am trying to initializing geth node with the following Gensis file content { "nonce": "0x00000000000000042", "timestamp": "0x0", "parentHash": "...
0
votes
1answer
152 views

Major conceptual misunderstandings about genesis.json

I am having a hugely difficult time understanding the genesis.json file. Assumption: it seems to me that it serves to both initialize the first block, and also set configuration parameters for the ...
1
vote
1answer
180 views

Why is there a nonce and mixHash value in the genesis file?

I may not fully understand the genesis file. Why is there a nonce and mixHash value in the file if nothing is being mined? It was my impression the genesis file is used to bootstrap block 0, then ...
3
votes
1answer
112 views

Can someone verify this answer: gasLimit vs. minGasLimit

I would have thought that these are the upper and lower bounds of how much gas can be used in any one transaction. But the mainnet file has the same value for each of these. Can someone explain what ...

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