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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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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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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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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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119 views

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
46 views

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
103 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
81 views

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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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
99 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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18 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
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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
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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
28 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
35 views

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
226 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
56 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 ...
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1answer
24 views

Easier Installation of privatenode for non-technical users

I have seen documentation of creating privatenet using geth. But it holds few commands which will not be a better option for users/clients who doesn't have technical knowledge to use the application ...
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How to update ethereum node if using private ethereum chain

Suppose I have created one private blockchain using ethereum nodes now I would like to have all the latest features which was released over Ethereum public chain to my private blockchain, is it ...
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1answer
76 views

Why is zether needed in Quorum if transactions are private between nodes?

As you may know JPMorgan has released zether which allows to make anonymous transactions in Quorum using zkp technology. But I have a question regarding why Quorum needs it. Since transactions ...
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26 views

invalid genesis file: invalid character ',' after object key

I am trying to created ethereum private network. platform - Windows , geth 1.8.27-stable I created C:\myeth\genesis.json. genesis.json { "config": { "chainId": 0, "...
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1answer
49 views

How to create a private ethereum network [closed]

I want to understand how to create a private blockchain using ethereum and create a minable coin. Also, I want to know if I can modify the consensus algorithm that runs on every node? There are ...
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1answer
33 views

Multiply small rational number to obtain integer piece

I'm trying to make some advanced calculations in Solidity. I was able to successfully implement the algorithm on my contract, but its results are way below zero, and whenever I try to get it with ...
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0answers
26 views

How to stop the update check for the mist in ubuntu

i'm deploying my private chain in Ubuntu16.04, everything works fine, and i can connect to the node by the command mist --rpc /geth.ipc,but when i have to connect the private chain and mist offline, ...
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0answers
23 views

Why would a node stop updating chain?

I am running a private network and one node seems to have stopped updating its chain. It is stuck at block 264 while the others are hundreds past it. It is still connected to the network, but it has ...
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1answer
50 views

TX fails in private blockchain when trying to access an ERC20 contract from another contract

I have an ERC20 contract and I am trying to access it from another contract, which is a Faucet. In the Faucet I have a function to query an account's balance, and another one to transfer some tokens ...
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1answer
18 views

When is chain data (length) compared between nodes? Is there any way to control this?

I am trying to use an ethereum blockchain in a multiagent network. I would like to control when information is exchanged between nodes to keep the network synchronous, so I am trying to figure out how ...
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0answers
45 views

Unable to interact with Smart Contract using Ethereum node Javascript console

I deployed a smart contract and to interact with that I've written Javascript. When I use loadScript('requestor.js') in my geth console I'm getting the following error Line 236 in my code is ...
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1answer
52 views

Static difficulty in 1.8.27 for local network

I am having trouble getting geth 1.8.27 to have a static difficulty on a private network. I followed the instructions from here. But when I test it, the difficulty still increases. I tried again, ...
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1answer
91 views

Can I store data like an excel file on the Ethereum?

I am a university student studying Ethereum in South Korea. It is not a regular course but a personal study due to interest! I would like to make a conceptual diagram of 'Smart Factory' using private ...
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1answer
49 views

GUI miners for Private Ethereum Blockchain

I have setup a multinode private Ethereum blockchain with geth. I am using geth miner (miner.start(thread) at geth console) for mining blocks but my other nodes users want to use GUI miner instead of ...
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2answers
30 views

Predefine set of transactions to be added as soon as a private chain is initialised

I need some transactions with predefined data that needs to be added immediately after the genesis block. Apart from actually making those transactions through Geth, is there a way to automate these ...
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On an Ethereum private chain, can the rewards of mining be user-defined? [duplicate]

I have created my Ethereum private chain via Geth. I noticed that the rewards to block miners are pre-set as 5 Ether. Can I change this setting?
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1answer
64 views

Is it possible to modify privateFor addreses in a private Smart Contract (Quorum)?

I know how a private smart contract works providing a list of accepted addreses to privateFor property, but what if I want to disable (or enable) any address visibility? Should I deploy a new Smart ...
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1answer
52 views

How to show partial information on private transaction?

I want to achieve the following requirement in quorum blockchain. 1) Participant A sells a red asset to Participant B for 100 dollars. 2) Participant B paints the asset blue. 3) ...
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0answers
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Transaction included in block whereas log not generated

When I sent a transaction continuously below 27 Transaction Per Second (TPS) then all transaction is included in a block and generated the log as expected. Whereas When TPS increases above 27 then ...
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1answer
54 views

Can ganache-cli connects to another ganache-cli?

Is it possible to create a private network using ganache-cli? Can a ganache-cli running on port 8545 connect to ganache-cli running on port 9545? Can we use ganache-cli as a node? Or it is a ...