Linked Questions

0 votes
2 answers
219 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 ...
  • 297
0 votes
0 answers
21 views

Is there a field to let a custom msg like Satoshi did for Bitcoin in the genesis file? [duplicate]

For a "private" ethereum network (private as not ethereum mainnet) I would like to know if we can set custom fields in genesis file. Is just the hash of the file that matters and we can add ...
  • 303
16 votes
3 answers
28k 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 ...
9 votes
4 answers
20k views

How to increase gas limit in block using geth?

When I try to execute methods from my smart-contract, I get limited by the gas limit in a block and can't do anything. How to change the gas limit in the block?
21 votes
1 answer
7k 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
3 answers
4k 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 ...
  • 797
4 votes
1 answer
6k 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,...
  • 1,994
4 votes
1 answer
4k 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?
  • 321
4 votes
2 answers
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 { ...
  • 579
5 votes
1 answer
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?
  • 83
4 votes
1 answer
1k 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 } ...
  • 81.7k
4 votes
1 answer
561 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 ...
  • 2,606
0 votes
1 answer
1k views

I need some clarification about cloning Ethereum

I would like, just for learning purpose how to create a new crypto by cloning the Ethereum. I know how to make a clone of BTC and LTC, basically with that chains is enough modify some strings (such ...
  • 121
2 votes
0 answers
1k 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": "...
1 vote
1 answer
637 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 ...

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