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Questions tagged [private-blockchain]

Private blockchains are not available for the public and are maintained/secured by a cluster of trusted nodes. These kind of blockchains are useful when dealing with sensitive information.

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156 views

POA chain: intrinsic gas too low, contract deployment

I'm trying to deploy my smart contract to a private proof of authority chain with geth, but i always get the following error message intrinsic gas too low This is the JSON RPC request i'm sending. ...
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1answer
126 views

How do we extract the content of a hash manifest generated by swarm after a download?

As far I know, whenever we upload a file or a directory using: swarm up File we get back a hash that is the manifest containing the uploaded file. However, I am not sure I do understand how to ...
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2answers
539 views

Use private ethereum blockchain for storing data [closed]

I am new in ethereum blockchain technologies. I have some question that Is possible to use ethereum blockchain to store data (Like MySQL)..??? If yes... (for first question) have any documentation ...
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How to prevent DDOS in ethereum using PoA?

Using clique, how to prevent DDOS attack? Is there a way to set a whitelist of nodes which can send transactions, and blacklist all the others?
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156 views

Linux Geth Mining: Stuck at Commit New Mining Work in private blockchain Offline

System information Geth Version: 1.8.20-stable Go Version: go1.11.2 Operating System: linux GOPATH= GOROOT=/home/travis/.gimme/versions/go1.11.2.linux.amd64 Genesis.json { "config": { "chainId": ...
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57 views

How to read data from external files in Quorum Blockchain?

I have a use case where we have implemented Quorum Blockchain using AWS. The smart contract was written in Solidity. Initially we randomized the valued by coding in Smart Contract however we now want ...
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1answer
82 views

How can a peer request another peer to invoke a function from his private contract

I build a permissioned network using Quorum, I have a peerA which has a private smart contract, another peerB that cannot invoke functions of the smart contract as it is private So, can peerB send ...
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57 views

Balance from ethereum accounts on geth disappears

I have geth private network with 3 accounts A, B and C. each account has 100, 200 and 300 ether balance I connected to this network from Metamask and Transferred the balance of 50 eth from account A ...
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1answer
142 views

Connect different machines with PoA

i want to connect two different machines in a ethereum private network! I did it before with a normal PoW-Consesus but with PoA created by puppeth i cant see some Peers when i try: admin.peers ...
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1answer
66 views

Do I need blockchain to connect local database's?

Hello all and Happy New Year! My small business and my client use the same vendor application where the vendor application is locally installed at each location. Our client uses barcoding within ...
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1answer
40 views

Private ethereum network account related query

Please help with below queries: how to reset the paraphrase for an account on private ethereum network Is there a way to delete an account on private ethereum network How to enable the etherscan url ...
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40 views

Metamask to Private ethereum communication issue [duplicate]

When i connect to my private ethereum network using the 'Custom RPC' of the metamask, it is getting connected from the MetaMask. FYI, i am connecting from outside the network of my server, and all ...
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183 views

MetaMask to Private ethereum network connection - using Custom RPC fails

What should be the network ID (the one chosen is 3 i.e. Ropsten network) parameter in the below command in order, I want to connect with Custom RPC (which is hosting my private ethereum network) from ...
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1answer
208 views

Transactions on Ethereum private network using the MetaMask Ropsten test connection?

I have 4 accounts on my private blockchain ethereum network and one of the account has balance of 10000000000000000000 and other accounts have zero balance each. When I connect to this network from ...
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0answers
133 views

Gas estimation failed

whenever I want to run this code I get this error "Gas estimation errored with the following message (see below). The transaction execution will likely fail. Do you want to force sending? VM ...
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0answers
33 views

Delay on receiving block by peered node

Sometimes it takes an around of 25ms to import new block by the other peered node after mined by miner. But sometimes it increases directly around 400ms to import block by peered node after mined by ...
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1answer
126 views

Set up backup from private Ethereum (Ganache) [duplicate]

I have created an ethereum application with Ganache and truffle js. i have installed ganache in a server, and th application work. but when i stop the server i lose the the smart contract that i have ...
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2answers
99 views

How to backup POA based ethereum private blockchain and restore it in a fresh new environment

Is there a way to backup the POA based ethereum private block-chain [created from microsoft azure POA template] and also restore it in a all new environment with out loosing any transactions & ...
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1answer
85 views

Boot Node issue

When I create a bootnode, I am not getting the enode. So I used this link for reference to derive it. However, the below is happening. It seems that the bootnode address is 128 bits whereas it is ...
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0answers
89 views

Image and file storage in block chain

Is it possible to store a base64 image code as string in block chain? I know we can use IPFS or Swarm as a tool to store an image or a document, but if someone gets to know about the hash anyone can ...
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1answer
121 views

I have question about private block chain gas structure

I have a basic question about gas price charged for transaction. Say I have a private ethereum block chain with ten nodes and I don't want to charge any fee for the transaction taking place in this ...
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1answer
412 views

PoA private net keeps mining blocks at high rate with no transactions

I am creating a private network based on Clique (PoA) and I have a certain problem with the amount of blocks mined by my two nodes. The number of blocks is very high I quickly reached hundreds of ...
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1answer
82 views

How to gather all addresses of nodes in a private network?

I am currently learning core-development in go-ethereum. I am a little weak with networking, RPC and connections. I am trying to write a function in my own consensus mechanism that gathers all ...
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1answer
36 views

Peering over a direct L2 link without IP addresses

As part of a big solution incorporating blockchain and data networking, I'd like to know how would 2 nodes establish a blockchain peering on their direct L2 Ethernet Link that has no IP addresses ...
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1answer
450 views

How to create Multi-node private ethereum blockchain network (windows platform)

I need help in how we can create multi-node private network on ethereum blockchain preferably on windows platform. My Approach (please suggest if I can follow some better one): First I want to try to ...
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1answer
62 views

Understanding what happens between transaction creation and block creation in Proof of Authority

I am currently writing my thesis where I'm investigating the potential of blockchain technology to become the underlying technology in a system that is create and record qualifications. I'm at the ...
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1answer
501 views

Where is the function that rewards the miner address for mining the block?

I have recently been digging into go-ethereum and have 'plugged' my own consensus mechanism which requires a node to solve a simple equation (2+2) etc to seal a block. However, even after letting it ...
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0answers
35 views

Geth and Private Blockchain Mining

I am trying to set up a private blockchain for the first time with a Geth client. After initializing my custom genesis json file, running the networkid in the console and setting up a couple of ...
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2answers
186 views

web3j: EthSendTransaction.sendTransaction() is throwing “Error processing transaction request: Invalid params: invalid format”

I am trying to send a transaction to an address: 0xDD210......... using the EthSendTransaction.sendTransaction() method from the org.web3j.protocol.core.methods.response.EthSendTransaction library. ...
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0answers
104 views

Quorum :- metamask do not support privateFor feature of quorum

i got to know that metamask do not support privateFor because of which private transaction for quorum dapp was not behaving as expected. so, I can't use metamask for my quorum DApp to switch port and ...
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0answers
86 views

Miner accepting 0 price transactions

I am hosting a private blockchain and I am testing out the Geth functionality. I have deployed a Solidity contract based on the Greeter example. The functionality is not important, but suffice to say ...
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0answers
90 views

I have connected two notes using bootnode in ethereum private blockchain but mining is not started why?

I have generated the enode from Bootnode in Ethereum private network and i connected three individual nodes using that enode through Bootnode, and i have checked whether that nodes are connected or ...
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0answers
106 views

Private network: Using geth to mine for parity nodes

I want to set up a private Ethereum network using a parity client. Ideally, I want to resemble the "real" Ethereum network as close as possible. Thus, I want to set up a proof of work network. For ...
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1answer
34 views

Where goes eth cost in private chain

I have a private test blockchain with ganache. I deploy one contract and make a couple transactions. Looking at the ganache UI I realized that the first account haves a ether consume to make the ...
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1answer
67 views

Unable ts start Bootnode, am new to private blockchian, Can anyone tell me what am i missing

bootnode : The term 'bootnode' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path ...
2
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1answer
85 views

Removing sealers from clique genesis

Running a private POA with clique. I know it is possible to add and remove signers using clique.propose(). However, If I lose access to one of the sealers defined in the genesis file is it possible ...
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0answers
43 views

simulation or performance evaluation with Ethereum testnet

I was if you could help me about simulation. How can I simulate the performance of my following IoT-based Application with Ethereum testnet? In my senario,there are some nodes that store sensor data ...
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2answers
984 views

What happens if you transfer ether and no miner is running?

What happen if I transfer ether from account a to account b on a private chain with just one node and that node is not mining?
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0answers
63 views

What possibly could go wrong if I leave my private blockchain node 30303 port open to public? [duplicate]

I have the following setup: All the nodes inside my cluster are talking to each other via 30303 port. When I want to talk to them, I'm using a Geth light client via HTTP JSON RPC port 8545. Only the ...
3
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1answer
247 views

Deploying a smart contract from EVM Bytecode via rpc calls

I am currently trying to deploy a smart contract with bytecode in a private Ethereum chain, using the "dev" chain of the parity client. For this, I compiled the following contract: pragma solidity ^...
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1answer
254 views

Cloning geth and adding a POS consensus algorithm? [closed]

I am currently learning how to use geth, so far I was able to create a private POW and POA blockchain using one of its consensus types (Clique). I am wondering how feasible it would be to clone the ...
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1answer
236 views

Clique PoA Private Blockchain: Need Suggestion for Block Gas Target and Block Gas Limit

I'm following this article to create my own PoA private blockchain. Now I'm stucked at this section after number 13: I've checked the Puppeth source code and Geth CLI docs, but I'm still not quite ...
2
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0answers
321 views

Puppeth: No ethstats server configured

Update This is an issue with Docker Compose >= 1.23.0 and I've raised this in the go-ethereum GitHub issues tracker. I'm following this guide to create my own private blockchain using PoA consensus. ...
2
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1answer
24 views

How to change the crypto-currency that is used in paying for gas fees in a private network

I have deployed my own network of blockchain that is based on the ethereum network. I wanted to know if one could change the currency used to pay for the gas on the private network.
2
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0answers
49 views

Generating genesis.conf for Clique PoA private network via command line

I'm trying to generate a Clique POA genesis file that specifies the original sealers using automation. However, puppeth only supports user input at the moment. There's no support for command line ...
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1answer
27 views

DApp on Node2 accessing smart contract deployed by Node1

Node 1(Desktop) deployed a contract on private blockchain. From node2(Laptop),I want to interact with the contract. But I failed at 'web3.version.getNetwork(err, netId)' function.This function throws ...
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1answer
46 views

Not connecting to private blockchain from another node on the network [duplicate]

I have a Desktop and Laptop.I have configured private blockchain on my Desktop(node1) and able to sync with it from Node2 Laptop.But I am not able to get connected to the contract deployed on Node 1 ...
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1answer
67 views

how to include transations in genesis block

can one please advise how to include transactions in the genesis block of private ethereum network ? can it be done via genesis.json similarly to contract using code: parameter ?
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0answers
109 views

How to create private chain in trinity / py-evm?

I am doing academic research using ethereum and want to use trinity / py-evm for the same. I have installed trinity and py-evm now next steps for me is to create a private chain and write some ...
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1answer
105 views

Configuring geth so that it can only connect to my private local blockchain?

Basically I would like to know how to configure geth so that it can only connect to my private ethereum blockchain that is hosted on another machine? Many thanks in advance!