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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Uncaught (in promise) TypeError: instance.events is undefined

I am getting this error. Uncaught (in promise) TypeError: instance.events is undefined App.contracts.UkTokenSale.deployed().then((instance)=>{ console.log(instance); instance.events....
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How can blockchain be applied other than cryptocurrencies?

How can blockchain be applied other than cryptocurrencies? May I ask for some diagrams that abstractly explain the system behind the non-monetary application of blockchain? I cannot seem to wrap my ...
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how to reduce transaction fees on private blockchains?

I have some questions regarding transaction fees on private blockchain. I'd appreciate your help. Also, if there are any references I can read about this, please let me know. Do transaction fees ...
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What is the process of creating a hard fork of Ethereum? [duplicate]

I am interested in creating a hard fork of Ethereum for production use. The idea is to end up with a separate blockchain similar to Ethereum Classic. As previously stated, I will be using this ...
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Have been having this error, ParserError: Expected ';' but got '}'

// SPDX-License-Identifier: GPL-3.0 pragma solidity >=0.7.0 <0.9.0; contract will { address owner; uint fortune; bool deceased; constructor() payable public { owner = ...
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How to calculate block propagation latency in Geth?

i am trying to calculate block propagation latency in a private network. is there a command for it? please share some thoughts on how can we arrive at the calculation .
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In Go Ethereum private chain what is the maximum limit of number of transactions in a single block

What is maximum limit of transaction packaging in single block ? Can it be increased ? If yes how ?
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Connecting to Private Geth Blockchain network using MetaMask

I am new to Blockchain and created a private geth network in Aws EC2. I need to connect my metmask wallet to that network. From my metamask wallet , I am not able to see that network. Kindly let me ...
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Where can I get a list of blockchain network?

Ethereum is just one network out of many? Where can I get a list of blockchain networks (ethereum, bitcoin, ripple, Stellar)?
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How to identify a smart contract transaction

Apologies if this is a bit of a noob question. But I have a bit of trouble understanding a concept. I am designing a Smart Contract where I need to send data for the same transaction from multiple ...
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How can we connect two different private blockchains to each other in Geth?

I have two blockchains that are working separately. I'm trying to connect them. This connection can help me to make communication between one node in blockchain 1 and another node in blockchain 2. Can ...
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"Head state missing, repairing" after private network crash. Any way to recover the blocks?

I'm running a small PoA private network (2 nodes, one signer, one for API purposes). Yesterday, the system both nodes are running on crashed due to an unrelated issue. As a result, both geth instances ...
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How to build an Ethereum private chain using POS consensus

I want to use POS consensus to build my own private chain, who can tell me how to do it?
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What are the different between geth command and geth console?

I have launched a private ethereum network on my local by using geth command: geth --datadir node1 account new geth --datadir node1 --http --dev --http.corsdomain "*" --http.api web3,eth,...
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How can I make the transactions in a ethereum private chain as fast as possible?

At the moment I am evaluating the possibilities of using an ethereum private chain for a special use case. Incidentally, I'm still at the very beginning, also when it comes to understanding ethereum ...
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how to find free network id and chain id for private network for go ethereum

I want to deploy a test node for this I want to know which network id and chain id is free to use for this private network, is there a way to check which one is available to avoid any conflict with ...
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admin.addpeers() is too slow?

I am running a private network where nodes add and remove each other dynamically (it is a mobile robotics system, where robots become peers if they can communicate). The problem is: the first time a ...
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Change Native token name in private blockchaiin

Is there a way to change the native currency on geth for private blockchain? Use XXX currency symbol instead of ETH. Is there any file or code on the go-ethereum/geth source code that will help me to ...
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How to mine only on transaction or reduce the disk storage used by HyperLedger Besu IBFT 2.0?

I have been following the tutorial for creating a private IBFT 2.0 network using Hyperledger Besu. The issue is that the blocks are created every 2 seconds and many blocks are created with no ...
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Private network desync

This is a similar to question to this one I have just setup 2 private nodes on AWS EC2 via geth, which are connected to each other, and have 1 "Hello World" smart contract already mined. ...
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flag provided but not defined

Am starting off in blockchain development using the book Mastering Blockchain A deep dive into distributed ledgers... Am using WSL. $geth version Geth Version: 1.10.9-stable Git Commit: ...
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Mixing private and public contracts in EEA ("Quorum")

Q1: If a privately deployed smart-contract receives a private transaction, can such smart-contract make read-only use of some already deployed smart-contract in the public network (I'm thinking for ...
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Read smart contract data from blockchain itself

I'm trying to figure out if it's possible to read smart contract data from the blockchain itself. I know in ordinary circumstances, smart contracts sit on top of the chain in the ledger. I'd like to ...
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Merkle Patricia Hash Generator

Is a math algorithmic (symbolic) flowchart (not code) available for Merkle Patricia Hash Generator used by Ethereum?
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What could be the problem if there is only one sealer in private network with PoA Consensus?

I have a private network created using geth and I want to use it as a decentralized database. Currently, I'm testing the network using 3 nodes which one of the nodes as a validator (hence only one ...
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Ethereum cluster in kubernetes

I am trying to set up a private ethereum cluster in kubernetes. I have tried to use the stable deprecated helm chart, but it only works with older versions of the ethereum/client-go image. When I use ...
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tx fee exceeds the configured cap while deploying in contracts in private network in geth

While deploying my contracts over private network which is configured in geth I am getting the following warnings. It seems suspicious to me as if some intruder is trying to breach the network. I ...
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Error "Snapshot extension registration failed" when connecting nodes

Description. The error occurred during the process of building an Ethernet private chain, and I found that the node could not connect. The error message in the log is as follows. INFO [07-24|09:06:36....
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admin.addPeer() takes a very long time to add the peer

I am running a private network where nodes add and remove each other dynamically. I have a problem where, the first time a node performs admin.addPeer() to a neighbor the peering is instant (as ...
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Transactions are not processed

Transactions are not processed I configured the node for an external ip, transactions do not pass through the remix and the geth console . geth --datadir data --networkid 9024 --nat extip:IP --rpc --...
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Blockchain with fixed number of blocks using geth

I want to create a private blockchain with geth. In my case, the smart contract should be deployed (for example in block 9) and every block after this block should be deleted after creation. I want to ...
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admin.peers shows peer info (local and public ip). Is this cause for concern?

I'm connecting to a private blockchain network over the internet using geth. In the console of geth if you run admin.peers it lists both: local_address(internal ip) remote_address(external ip) I have ...
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I'm running a private Ethereum network, how to properly share my enode address with my friends?

I have setup a private network and I'm looking for advice on a few things. According to the official guide I can use Tor onion addresses. My question is how do I share this address properly? I have ...
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Unable to find data saved into smart contract getting below error everything is fine which is mentioned into error e.g. gas, block number sync etc

i am getting this error into private blockchain : Returned values aren't valid, did it run Out of Gas? You might also see this error if you are not using the correct ABI for the contract you are ...
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Is it possible to change the network id in GETH once geth is initialized?

I want to change the network_id of my private ethereum network setup with geth. It seems like I have to change it in genesis.json file and also have that id when I start geth. But, to apply the ...
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web3.eth.contracts.myMethod().call() returns nothing

I'm still new to ethereum development, and when trying to execute call() on a created contract, I'm receiving varying results. Sometimes the call works, and other times it returns the error Returned ...
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Remotely execute JS function on node

Let's say that I have made a function foo() in the js console on node A: function foo() {return 42;} I would now like to execute this from node B remotely. Is this possible? I have tried to use web3....
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Web3ProviderEngine does not support synchronous requests on deploy to private network

I know there are many similar questions, but I've been through all of them and haven't got the answer I'm looking for. I'm trying to deploy a smart contract (that's already been compiled and deployed ...
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Binance Smart Chain Full Node Implementation - geth is not recognized (Error)

I am trying to install Binance network,by following the official link https://docs.binance.org/smart-chain/developer/fullnode.html However, while trying to run make geth I find the below error. ...
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How to get Ether in private blockchain?

Fast summary: Need a faucet-like funcionality in my private blockchain to give Ether to the newly on-demand created wallets from Android Dapp. I'm working in a project where I've deployed a totally ...
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Puppeth issue creating ethstats

Im trying to setup puppeth Ethstats on a Ubuntu machine to connect to my geth private chain and I'm getting the error 'err="docker configured incorrectly: bash: docker: command not found\n"' ...
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Clique network: Sign with multiple accounts in a single node

Is it possible to multi-sign a block, by a single geth node (with multiple unlocked sealer-accounts)? Suppose we have multiple sealer accounts (in a clique network). Is it possible to unlock some of ...
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How do I get my Testnet listed on chainid.network

I need assistance with getting my testnet listed on the website chainid.networks. I have already seen the GitHub examples but I would like to know what each field represents. Thank you!
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Is there any way to configure hyperledger besu to mine blocks only when there are transactions?

I have been following this tutorial: https://besu.hyperledger.org/en/stable/Tutorials/Private-Network/Create-IBFT-Network/ Everything works fine, however I can see that every 2 seconds new block is ...
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Is it possible to hard fork a private network to Berlin?

I have a Proof-of-Authority private Ethereum network that has Istanbul EVM version and created by clique engine. I have multiple signer nodes that has Geth version: v1.10.1-stable-c2d2f4ed. "...
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Throughput and Latency of Private Ethereum Network

How do I calculate Throughput and Latency of a private Ethereum network that I have set up locally on my computer? I tried the solution given in Measuring transaction latency and throughput in a multi ...
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Storage space geth for private network?

Setup a private network with clique at 15 secs block creation. Started with 3 nodes. Then deployed a smart contract (ERC 721) and send two transactions. After about 2 days idling, and no transactions, ...
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private blockchain - specific node

Is it possible to do in a smart contract that a particular node can approve certain actions like checking if the sender's address is authenticated by that specific node and that it will confirm it by ...
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Bootstrap node that does not rebroadcast transactions?

I have a local ethereum network where peers connect to each other based on certain conditions. Local forks and merging occur, so it is common that there are multiple blockchain versions with different ...
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How to stop and restart a multinode Ethereum private network?

I am testing a multinode Ethereum private network setup with Docker, 1 bootnode, 1 node, 2 miners, netstats and 2 swarm, total 7 containers. When I stop and restart the containers, the chain stops ...

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