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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account unlock with HTTP access is forbidden [duplicate]

I am using in the geth console and there is a similar error. Do I add "--allow-insecure-unlock" when I "init a node"? personal.unlockAccount(eth.accounts1) Any suggestion would be helpful. Thank ...
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Does the use of Non-interactive zero-knowledge proof (zk-snark) will eliminate the use of (consensus algorithm e.g. work proof)?

The privacy of the blockchain transaction is a high-demand topic these days due to some application use case requiring strict privacy protection. Some of the techniques applied to blockchain ...
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Which Protocol is suitable if I want a validated person to authenticate the block?

I want to create a system in which Every user will have some specific authorities. Like Examination will validate the block containnig Student Marks. Finance should have authority to add block ...
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34 views

Contract not deploying on private network

I have a smart contract a little bit like this: pragma solidity ^0.5.10; contract sc { struct element { uint96 firstKey; uint96 secondKey; bytes32 firstData; ...
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Private Ethereum Platform development with Authentication System

I have to develop a system for Univeristy which provides digital certificates. I know some approaches but stuck about which approach I should choose. The system will have (suppose 5 nodes + 1 super ...
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Geth stuck at “Regenerated local transaction journal transactions=0 accounts=0”,PLEASE HELP

I run a private chain with mulitpe Clique POA nodes for several days. Today I found the block can not update normally. The Geth version(executale version) info: [root@localhost ~]# geth version WARN ...
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How to obtain data from a private PoA Ethereum Network?

I want to fetch data from a private PoA ethereum network running on a local computer. The data will be used for anomaly detection. I need contract interaction data (function calls etc.), to observe ...
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How to copy the data from a running private network to another

I have two seperately running private ethereum networks,i want to copy the data from the first private network to the second one without stopping.I have tried multiple ways but was not successful.I ...
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Problem when unlocking account in private ethereum blockchain [duplicate]

I tried this statement personal.unlockAccount(web3.eth.coinbase, "password") But I am getting this error . Error: account unlock with HTTP access is forbidden Any suggestion would be helpful. ...
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1answer
42 views

How to run 2 nodes simultaneously?

I created a Node 0 and exited before creating Node 1. Then I created Node 1. And using Admin API, I connected Node 1 to Node 0. Node 1 is up and running. How do I start Node 0 and sync it with Node 1?...
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How do I perform a fully anonymous transaction using Stealth addresses in Aztec protocol?

I want to know how to make use of Aztec's stealth address protocol.
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miner.stop() returns null does not stop mining on private chain

I am using Version: 1.9.0-unstable of geth, and I noticed miner.stop() does not work anymore. I am sure it always worked. > eth.blockNumber 901069 > miner.stop() null > eth.blockNumber ...
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Non-stop “Served eth_signTransaction” warnings after upgrading geth to 1.9.x for private network?

I just upgraded the geth nodes of my private PoW network from 1.8.27 to 1.9.1, and right after starting up the nodes, it spills out tons of warnings non-stop like WARN [07-30|18:33:52.134] Served ...
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Solidity and Web3js codes are not working inside the private Ethereum(geth) network but same codes are working in public ethereum

geth version : 1.9.0-stable-52f24617, node version : v10.16.3, npm version : 6.9.0, web3 version : -- web3@1.0.0-beta.36. genesis.json: { "config": { "chainId": 966308076, "homesteadBlock": 0, "...
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Parity doesn't send a notification to ethminer

I can't get the ethminer to work with my private network. I start the parity in stratum mode, passing my own config file as a parameter, and then launch the ethminer. He successfully logs in and ...
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1answer
14 views

Set up hardforks parameters in parity JSON chain spec file for private network

I want to set up a private network for tests using parity, which will function in the same way as the current mainnet, but with very low block mining complexity. Is Is it true that for this I need to ...
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1answer
20 views

Implications of IP change on boot node?

I have a private blockchain using Parity. One of the bootnodes may have to change the IP. What is the correct way to do this and what are the implications of this? This question implies questions ...
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1answer
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node cannot be made up in private blockchain by using command line

I have created the genesis.json The genesis json content is { "config": { "chainId": 46860, "homesteadBlock": 1, "eip150Block": 2, "eip150Hash": "...
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Should I convert Centeralised web app to Multichain because it is free to use and more secure compare to webapp?

I am Web app developer and exploring the blockchain technology from few months. I want to convert the live centralized WebApp to Decentralized Blockchain application. I know there is a high cost ...
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1answer
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what will happen to transactions on smaller length chain when peered with longer length chain in private ethereum

what will happen to transactions on smaller length chain when peered with longer length chain in private ethereum? Below is the scenario Step 1: I have started Ethreum private chain in 2 different ...
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1answer
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How to add a custom JSON-RPC endpoint to geth?

I'm building an Ethereum private network and I want to make a custom JSON-RPC endpoint. I've been customizing and adding some things in the go-ethereum source code but I don't know yet where to look ...
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1answer
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How to modify the algorithm of transaction selection in Ethereum private net?

By default, miners select transactions with high fees from the mempool. So, transactions which are dependent and have a specific order can be selected randomly without respecting this order. Will I be ...
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1answer
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Is it possible to hard fork a private network to Constantinople?

I have a Proof-of-Authority private Ethereum network that has Byzantium EVM version and created by clique engine. I have a single miner that has Geth version: v1.8.27. { "config": { "chainId": ...
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How does one find/generate the SectionHead, CHTRoot and BloomRoot on a private network

I'm relatively new to go-lang and Ethereum, so I started off by deploying a private network at home and over a few servers. I'm now working on trying to get light clients to sync but I know for a fact ...
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Set Date and Time in a Private Network

I have created a private network using geth in ubuntu, but it takes date & time from the system on which it runs. So if the system date of the master node is changed, it affects syncing on the ...
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Truffle Contract deployment >> Error: Returned values aren't valid, did it run Out of Gas?

I have a rpc enabled running private ethereum blockchain node with mining enabled. I have connected to it using metamask and have performed some contract interactions (deployment, calling functions,...
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Not able to connect to private Ethereum Network with metamask

I am running a private Ethereum Network in a cloud VM. I started the node with these arguments: geth --datadir test --networkid 123 --rpc --rpccorsdomain "*" --rpcport 30308 --rpcaddr "0.0.0....
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Validator Contract deployment

Hello When I try to deploy below contract i get this error Open new block failed with error Error(Engine(FailedSystemCall("Engine error (Failed to make system call: Bad jump destination 0)")), ...
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1answer
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How to connect frontend to a node

I created 2 nodes . I connect an accounts to metamask. I connect the smart contract with remix on the node. Now i am trying to connect frontend with the smart contract with web3. In the index.html i ...
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1answer
44 views

How to start a node on private ethereum chain using “geth --config config.toml”?

I set up a chique poa ethereum private chain. the node can start to work using the command below: geth --networkid 123456 --rpc --rpcport "8545" --rpcaddr 0.0.0.0 --rpccorsdomain "*" --datadir ./...
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The bootnode is not working properly

I am running a private ethereum network using geth. I started the bootnode first following the documentation and ran 5 different nodes on the same machine with same genesis file on same network with ...
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What is the scalability limit for POA Ethereum (number of nodes)?

Tried to find any benchmarks what is the maximum number of nodes for Ethereum PoA network. When does a network latency become crucial? Looking for any sources / empirical benchmarks.
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1answer
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How do I generate a TrustedCheckpoint(CHT) on my private chain?

I saw this link, but still don't know how to get CHTRoot and BloomRoot, only know that SectionHead is block[(SectionIndex+1)*32768-1].headhash https://github.com/ethereum/devp2p/blob/master/caps/les....
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1answer
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How to connect a dapp on private ethereum network [closed]

I created a private ethereum network with 3 nodes kai i have also created a dapp. How i can connect my dapp with my private network? Thank you!
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1answer
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How to call a contract function that alters blockchain state on geth console

It should be easy, but I'm having a hard time using a simple smart contract described in the Solidity language reference called SimpleStorage. It only as one attribute, a setter and a getter, and I'm ...
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Add Peer to AWS

I have created my private network over AWS and created two node and add them as peer which is working fine and node are connected. Now i want to setup third node on my local machine which is not AWS ...
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30 views

Metamask transactions keep stack at the txpool of a Quorum Private Network

System information Geth version: 1.7.2-stable-0905eda4 OS & Version: Ubuntu 16.04 Branch, Commit Hash or Release: HEAD detached at v2.2.1 Actual behaviour and Steps to reproduce the behaviour ...
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POA ethereum Add Authority Account Contract

Can someone point me right tutorial to understand the following 1) Genesis configuration for POA with pre-fund account 2) How to add Authority account at run time means once the blockchain is up ...
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1answer
56 views

Parity POA Smart Contract Method Always Fails

I have set up a private POA Network according to the tutorial from the parity homepage. I have two nodes running on localhost:8540 and localhost:8541. I have connected MetaMask to my first node and am ...
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Parity Ethereum Metamask

I have setup one test node on my machine and trying to connect with metamask and on node console i keep on receiving below message and unable to connect with node using metamask. 2019-06-14 14:48:32 ...
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17 views

Parity Ethereum - Public network

Want to create my own public network with pre-funded account, can any one point out the optimise, secure configuration for spanning node for Test and Main net ? To be more specific for Test Net I ...
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Private Etherum to work like Main Net

I want my private Ethereum blockchain to work like the Main net, I want to fix the number of mined ether (Set Max Cap over minded ether), and don't want that miners earn by mining empty blocks.
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1answer
59 views

web3 - Contract deployment has been reverted by the EVM

I want to deploy a contract but my transaction gets reverted. This only happens with Web3, while it works fine with Remix.I can assure the ABI and Bytecode are correct because I pasted them from Remix,...
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2answers
30 views

Private Blockchain

Suppose I create my own private blockchain using Ethereum over the public network means my node is reachable from the internet, now I don't want to share my genesis.json but still want that other can ...
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1answer
22 views

connecting geth to web3.go 1.0 via websockets or HTTP

Is there anyThing similar to web3.js written in go that allows me to communicate with the geth client ?
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1answer
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Same genesis for private network?

I have initialized one private node using geth and Genesis file, and now I want to span another node, in genesis file, I have mentioned on the account which will be pre-funded now I want Ans of below ...
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2answers
164 views

Verifying Modular exponentiation operation in etherum

I have Alice who should do some cryptographic operations off-chain. Then a smart contact has to verify equality by performing Modular exponentiation operation. I attached an image of the off-chain ...
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Genesis.json Change Name from ETH to Any other [duplicate]

I want to change the name of the currency while setting up my private ethereum node, is it possible ? and if possible how can we change it ?
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1answer
43 views

which port I use when I want to connect remix to my local quorum network?

I want to deploy a smart contract on my local network. I executed a local node via PRIVATE_CONFIG=ignore nohup geth --datadir ./Node1/new- node-1 --nodiscover --verbosity 5 --networkid ...