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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Forking a private chain consequences

If I were to fork my private Proof of Authority chain can I revert without pruning a block with corrupted data and subsequently all successor blocks which do have complete data and if so how can I ...
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How to solve the problem: java.lang.RuntimeException: Error processing transaction request: VM Exception while processing transaction: stack underflow [closed]

I generated JAVA wrapper solidity code. I am trying to deploy my contract on our local Ethereum blockchain and and get the following error: SLF4J: Failed to load class "org.slf4j.impl....
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Ethereum POA attack scenario

I am studying consensus algorithm. In the case of the proof-of-work algorithm, a double spending attack was possible by the miner making a transaction and presenting the longest block from which the ...
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Private PoA deployment leads to 'invalid gas used' error

I'm trying to deploy a contract to a private clique chain running on two devices (laptop and raspi). Deploying the contract when running multiple nodes on a single device worked fine as per usual, ...
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Error in doing private transactions for nodes on different VMs using quorum and tessera

I am pretty new to quorum/tessera. I have successfully tested a small POC with 3 quorum+tessera nodes on the same machine. Now, I am trying to do a similar POC with 4 nodes on different VMs. The nodes ...
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Account Management in Private Blockchain

I am new to Blockchain Application. I have read about the working of blockchain. Working on a POC where it requires private blockchain(Enterprise DApp). My question is how the accounts are managed in ...
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Who communicate on a private ethereum network?

I'm new to Go-Ethereum (GETH) and would like to ask a question that may seem quite dumb. Let's say that I create my own private ethereum blockchain with GETH (I created accounts, the genesis block...),...
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Free transaction on a private ethereum blockchain

I have developed a Dapp powered by Ethereum with truffle. And I want to deploy it on a private blockchain. But I have one question to ask before that. My question is: can I make in sort that my Dapp ...
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how to make metadata private? [closed]

I'd like to create customized NFT including metadata which is readable by only permitted users such as an owner. Is it possible to build? If yes, please let me know how to build it. Should I need to ...
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Access private transactions(payload or state) on a smart contract using tessera

I am pretty new to quorum/tessera and am trying to set up a small POC with 3 nodes. I followed the 7nodes setup example and similarly deployed 3 nodes on my system using Mysql as the database for ...
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Geth keeps changing coinbase / miner account and stops working. (POA Network)

I have set up a Geth POA network of 2 nodes on different cloud instances. Network was running good for 2 months but now suddenly it's getting connections from unknown peers and mining stops working. ...
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Quorum vs Private network Ethereum blockchain

I want to know what are the main features of a private Ethereum blockchain: the used consensus algorithm, the transaction fees, the time needed to produce a new block, the throughput, etc. Does it ...
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how to create hierarchical blockchin using Geth, ethereum?

As of my plan (in the attached figure) there will be 2 levels of blockchain. The top level blockchain (yellow circles) consist of 4 participant, admin top & admins middle. The bottom levels ...
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Error creating a IBFT nework in Quorum

I am following the link https://docs.goquorum.consensys.net/en/latest/Tutorials/Creating-A-Network-From-Scratch/ and getting stuck after I clone the istanbul-tool and hit make, it is giving me a make ...
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How to add USDT ERC20 Token to private blockchain

I am running a private ethereum blockchain on my machine using geth. I want to send USDT token from one address to another, but I could not because neither address have any USDT token. I have tried ...
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Why does ip address value differ in the enode url from the info output of a geth node instance to running admin.nodeInfo.enode in the js console?

I'm in the process of creating a private Ethereum network. I am able to successfully connect nodes on my local machine but unable to connect nodes in my LAN or outside my network. When I run a geth ...
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How to do private transactions in POA network with geth client like in besu?

In Hyperledger Besu you can create a private transactions between nodes maintaing privacy. How can I do similar transaction between my geth client in POA network
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Node not syncing on Private Blockchain

Node 1 is mining but Node 2 is not syncing Running admin.peers on Node 1 gives: Running admin.peers on Node 2 gives: Both Nodes are using same genesis block When starting console on Node 2 I used --...
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How to sync wallet files with different servers on private blockchain

We have a private blockchain setup with three instances on ubuntu 16.04. Each instance consists of 3 authorities to achieve availability in case of failure by redirecting to another instance. Folder ...
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Transaction is not included in block even block number is increasing [private-net]

I have forked geth and build from source. I have pending transactions but when running miner, miner only mines empty blocks. The pending transactions remain as it is. I have changed CalcDifficulty ...
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When truffle migrate required account to be unlocked?

I've done several deployment using truffle, but it didn't ask me to unlock the account while deploying the contract on my private chain. But recently I have done one deployment and it asked me to ...
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Can't connect node on private network with bootnode

I tried to create a private network with 2 nodes and 1 bootnode. Looking at the logs, the bootnode PING PONG both node, but both node still can't connect to each others. TRACE[08-31|15:11:02.458] >&...
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How to process transactions that are in txpool with status pending and queued?

I'm running a private chain and facing issue while doing transactions. All my transactions going to pending status. Hence I have increased gasprice, and now new transaction going to queue. Is there ...
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Why my private chain starting Geth on Ethereum mainnet

My private ethereum showing log "starting Geth on Ethereum mainnet.." here are the full logs INFO [08-27|09:14:02.302] Starting Geth on Ethereum mainnet... INFO [08-27|09:14:02.302] Bumping ...
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Served eth_sendTransaction err=“unknown account”

I'm facing issue with private chain, when I run the node, it shows the logs as below, and transaction went in pending status. Folder structure All the wallet file reside into keystore folder. Node....
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I could not use web3.js module and perform getAccounts etc. for Consortium networks. Hyperledger Besu

const Web3 = require('web3') //var web3 = new Web3('http://127.0.0.1:8585'); var web3 = new Web3(new Web3.providers.HttpProvider('http://localhost:8545')); // https://rinkeby.infura.io/v3/...
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Transaction from non-miner node is not getting mined sometimes

I have a private Ethereum network containing 2 nodes,NodeA and NodeB. When I initiate a sendTransaction from NodeA(non-mining node) to deploy Ethereum contract using JSON-RPC, the transaction hash is ...
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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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