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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quorum examples [closed]

I have problem when send transaction and need to check it using private.get() the output is 0 this result in any terminal . the correct get the value 42 can any one help me ?
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What would be good result measures in Ethereum

I'm thinking of a way to present relevant results measures for my blockchain. I can see how for hyperledger is interesting to present (transactions per second x block size) or (latency x block size). ...
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Private Blockchain Node Migration

I had a private ethereum blockchain with 1 node running in production. I accidentally ran a geth init genesis.json --datadir . command in my main node. Did this command overwrite the data directory ...
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geth mining not working without --allow-insecure-unlock (geth 1.9.16-stable-ea3b00ad)

I am running a private ethereum blockchain with POA geth --port 3000 --networkid 42 --datadir=./blkchain --maxpeers=5 --rpc --rpcport 8543 --rpcaddr 127.0.0.1 --rpccorsdomain "*" --rpcapi &...
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mining transaction in private blockchain

I am new to the blockchain issue, and I have read about it, but I had these questions. When I actually implement a private Blockchain on every transaction it costs a certain gas. Who pays for this ...
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How to use private blockchains in ethereumjs-tx@2.1.2?

I know this method var transaction = new Tx(rawTransaction, {chain:'ropsten'}); I tried var transaction = new Tx(rawTransaction, {chain:'192.168.XX.XX:8545'}); But get Error: Chain with name 192.168....
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Issue with failing to detect peers via Bootnode on Local Network

I am attempting to connect various nodes to my private blockchain on my local network using a bootnode to discover peers. Connecting the peers on the local machine running the bootnode is possible, ...
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Invalid block XX: unknown ancestor while restoring the chain - private blockchain

I'm trying to restore blockchain using import a rlp file geth import backup.rlp It show an error Is there any way to exclude the bad blocks while exporting the chain data? Also, if the gcmode is ...
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Can smart contract sate copy from one private blockchain to another?

I'm working with private blockchain(PoA), and we're looking for a disaster recovery plan for the chain. Currently, we have two instances 1) one is running API(node + web3) and interacts with the 2) ...
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Could not Able to start my genesis block “Fatal: Account unlock with HTTP access is forbidden!”

I am getting some problem while i am trying to mine for my genesis block on my Geth command prompt "Fatal: Account unlock with HTTP access is forbidden!" could anyone please provide me help ...
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Attach to tessera node failing

Im installed quorum with tessera but when i need to attach to any node using command $ ./attach.sh 1 show error "Fatal: Unable to attach to remote geth: dial unix qdata/dd1/geth.ipc: connect: no ...
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Connecting geth and openethereum on a private network

Private network, running geth 1.9.15 and openethereum 3.0.1. Parity converter was used to create the chain.json file for openethereum. The two node show the exact same: genesis block network id ...
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ERR_SSL_PROTOCOL_ERROR while connecting private blockchain

I'm working with private blockchain, and facing some issue with SSL configuration. The system has two components: The private blockchain that is configured on the VM. The web application that ...
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BlockNumber stuck on 0 while a private network node is looking for peers

I'm extremely new to Blockchain and mining, and I've followed this tutorial to create my first private blockchain. I am stuck when it comes to mining and I'm afraid I'm quite lost. Afte I've started ...
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How to reset private ethereum blockchain (Geth)?

I am running private ethereum blockchain using ethereum and now I want to reset the chain and delete all the contracts, transactions and logs and restart everything from block 0. What is the best way ...
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net.peerCount is zero: Two miners are not connected

I'm trying to build a local private blockchain of Ethereum in my own PC using Geth v1.9.15-stable-0f77f34b. I have installed Geth in a virtual machine with Ubuntu 18.04 OS using VMware Workstation Pro....
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Error: “Couldn't decode uint256 from ABI: 0x” Private Ethereum Network web3js MetaMask

I am trying to call the smart contract for data using this code and every time I am getting this error. I am using a Private Ethereum Network with MetaMask. The calling function is given below. ...
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Deploy smart contract to private network

I have been having issues deploing any smart contract to my private network. I'm using geth 1.9.15. Here ALL the steps that I made to get the error: //CustomGenesis.json { "config": { &...
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Where are the smart contract accounts stored in geth?

I have a single geth node running a private blockchain with a network ID N and data directory data/. I had deployed a smart contract ContractName on the same and things were working fine. I wanted to ...
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Why is Smart Contract call() method returning NULL in Ethereum Private Blockchain

This is where I am calling the contract function certify_find (hash, callback) { contract.methods.findDocHash(hash).call( function (error, result) { if (error) { console.log("Returned ERROR ...
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MetaMask - RPC Error: Error: [ethjs-rpc] rpc error with payload [obejct Object

I am trying to sign transactions using certify_send() function to a smart contract deployed to my private ethereum blockchain but I keep getting this error after I approve in MetaMask MetaMask - RPC ...
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1) How can we use Ethereum Alarm Clock for Scheduling a txn in Private network(using geth/ganache)

2) Can we schedule a txn in such a manner that it could be executed multiple times in a particular time window?(For eg: if we need to schedule the txn everyday 5.00 pm) or the EAC has the option of ...
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Scalability of private chain with 0 block time

What could be some issues in scalability if a block time of 0 is set to a private ethereum blockchain? If I set it to zero, blocks will only be added to the blockchain every time there's a single ...
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eth.coinbase gives the wallet address which is not exist in the system

I'm facing a strange issue, when I execute eth.coinbase command on Geth, it gives me wallet address which is not present in the key directory. But that isn't in the genesis file I'm not sure how ...
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sending transaction giving an error of “unknown account” after some time interval in Geth

I have review kinda same questions on this site, however, the issue in my case is different hence I'm asking. I have setup three nodes for the private chain, and it's working fine. I can send ...
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Ethereum Wallet(mist) not catching private network in windows 10

I have set these paths but not working C:\Program Files\Ethereum-Wallet and C:\Program Files\Geth I have made a private network using Geth, but when I installed the Ethereum Wallet, it is not ...
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How can two light nodes on a chain communicate individually?

Let's say I have two light nodes on a chain and I want them to exchange data ~3KB without appending anything to the chain. They are not on local network. How can I achieve it?
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Fail Transaction Using Metamask And Create Smart Contract Using Geth Private Blockchain

I have an error when building a private blockchain on my computer. The code that I run is like this (Simply my concept make it without mining and only focus on smart contract): genesis.json file { ...
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How other party can access my contract?

I am running private ethereum blockchain. As we know smart contract is used for agreements between non-trusting parties. Now, I am wondering how the other party can access/see my smart contract? ...
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What is the difference between IPDB and Blockchain Databases?

I wanted to know what are the differences between IPFS, interplanetary file system and a block chain database like IPDB and BigChainDB
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Eth 2.0 Private Chain

Now that Eth 2.0 testnet is in place, do we have a source to create a private chain of Eth2.0, similar to the private chain implementation of Eth 1.0. Any pointers are of great help Regards, Manoj
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uPort with private blockchain, is it free?

If I use uPort for a private blockchain, this means that all the transactions for identity management will be performed in the private network and are free?
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Peer nodes of another server not getting connected in private blockchain

I'm doing setup of a private blockchain using PoA, and facing issue in connectivity with peers of another server. I'm using geth 1.8.16, and created genesis file using puppeth. Structure Server-1 ...
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How to deploy a contract when a private chain start?

ethernet vererion: 1.8.x, language: golang 1.11.x I wrote a smart contract in solidity. The contract's contructor has two parameters like this: uint256 _initialAmount, string _tokenName I ...
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Contract deployment works but method calls fail

I think it has something to do with my start line geth --datadir ~/final --networkid 98763476 --rpcapi "web3,eth,personal,db,net" --rpcport 888 8 --rpcaddr "ip" --rpccorsdomain "*" --rpc --allow-...
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Starting Up tutorials for hyperledger fabric and Caliper Framework

I am new to Hyperledger world. My goal is to set up hyperledger fabric on my machine. Then, setting up a simple smart contract on the blockchain network. Then, using caliper to do measurements such as ...
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Miners are not working when running geth command in background in linux

I am running my private blockchain using geth on my ubuntu server with following cmd then its working fine geth --datadir ~/chaindata/ --networkid 45123 --verbosity 3 --rpc --port 30304 --rpcport ...
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Ethereum in space?

Is there a list of missions that have flown to space that have broadcasted the Ethereum network to ground? I'm interested to know the feasibility of this project and would like to start by surveying ...
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What causes .deployed() to return same contract instances in each test

It took me awhile to diagnose the problem. At first I just noticed that the states of my contracts were being affected by previous tests when running truffle test I then looked in the terminal tab in ...
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How do I unlock the Parity Ethereum Ethash prefunded account?

So i have my ethash node running with the following chainspec.json { "name": "Morden", "engine": { "Ethash": { "params": { "...
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Ethereum network event simulator

I would like to simulate and observe an emergent Ethereum network, so I could draw conclusions about the main net and simulate my own code at the infrastructure level. I am looking for the best tool ...
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Mining stops after some time in my Hyperledger-besu Private blockchain

I have been using Hyperledger-Besu's quickstart guide to build my private blockchain (with ibft2 as consensus algorithm) on an AWS instance, which basically just clones that repo https://github.com/...
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How to include constructor arguments in bytecode for smart contract deployment in genesis block?

Please excuse if the title is not perfectly accurate but I had a hard time fitting my problem into 1 question. If you have a better title please feel free to suggest it and i will edit it. I want to "...
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Will there be support for admin.removePeer()?

Newest geth version has an admin.removePeer('') function, which I use in my IoT application. How easy is it to fork off web3.py and create a w3.admin.removePeer function? Can someone point me in the ...
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What should be the limit for miner to mine a block

I am trying to run my smart contract in remix ide, below is my smart contract code: pragma solidity >=0.4.17 <0.7.0; pragma experimental ABIEncoderV2; contract Department{ struct Employee{ ...
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Pending transactions at the client machine, but minter is not minting a new block since there are no pending transactions

I am running Blockbench on Quorom Raft using smallbank workload: 4 minters and 4 clients. Following the logs, I found that sometimes 1 specific client (Client 4) has pending transactions but the ...
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Ethereum Peer Removal

Current Geth version supports a removePeer function, which is great. I am working on a IoT application proof of concept using a local ethereum network, and I need to dynamically add and remove peers ...
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How to create a token exchange for private blockchain?

I have requirement to create a exchange for my private blockchain tokens, where registered user can buy and sell tokens, and token price goes up and down on demand and supply. I have searched bit, ...
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Azure Blockchain Service node properties [closed]

What exactly are Access key 1, Access key 2, Member account, Web socket, DNS, creater account, etc. of a node in Azure Blockchain Service? I am getting confused as to what are these. Also what are the ...

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