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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 is the purpose of non-mining sealer nodes in clique POA private ethereum network with respect to the clique consensus

I did setup a private POA ethereum network with 4 nodes with 3 of them mining . I went on to try a lot of combinations with some miners and sealers and reached to a conclusion that every miner hash to ...
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11 views

Failed to connect to localhost/0:0:0:0:0:0:0:1:8545

When I am doing one transaction with the help of Java web3j library, it's not connecting to localhost(my private network). And giving this error. package com.kaushik.blockchain; import java.math....
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7 views

Ethereum syncing 2 different ledgers

I just realised my node is allowing a small mess to continue: On my PC I have 2 directories: Dir1: ChainID 12345, last Block, 8000 Dir2: ChainID 67890, Last Block, 85 I was using Dir1 for some ...
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35 views

Private Ethereum blockchain: missing trie node

I deployed a private blockchain with the following steps: Setting the difficulty to a fixed value (see Running a “quick” Ethereum private network for experimentation and testing) and creating the ...
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1answer
23 views

Block time and confirmation time

I have been reading in different papers and comments these two concepts and I would like to know the difference between them(if there is, sometimes it is a bit confusing). I understand that the block ...
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1answer
33 views

Private Ethereum blockchain does not sync last 65 block

I've successfully create a private Ethereum network, I've two machines on the same local network, the first one is where I've created the chain, the second should be a new peer that should sync with ...
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1answer
28 views

Allow access to private ethereum network from certain IP only

I have a question regarding restriction access to private etehreum network. I created my Private Etehreum network using Geth(for now just only with one node) on the Ubuntu 16.04 virtual machine. And ...
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1answer
13 views

Node is showing up as a Peer in Ethstats

I am experimenting which Blockchains in a private environment. I have created two nodes and they are showing up just fine in the ethstats page. One is local on my pc, the other one is also local but ...
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20 views

Connect to a private network through an iOS app

I have a private network running with a custom smart contract. Now I want to create a light node on an iPhone, which can interact with the smart contract. Unfortunately I can't find any documentation ...
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2answers
19 views

How does the User sign Ethereum transactions when interacting with blockchain via an web3j-based intermediate API?

We have a private Ethereum network running in our testbed. And a web3j-based (Java) API exposes various functionalities to the deployed smart contracts on the blockchain. The API connects to the ...
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2answers
20 views

Change in genesis file without creating chain from the start

We're working with private Blockchain(PoA, 2 consensus node) and we've already created few blocks. Now we'd like to add some change in genesis file. So, basically question is, how can we support ...
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0answers
10 views

Cannot connect to the Web3 provider when rpccorsdomain is on

I am getting the message: Not possible to connect to the Web3 provider. Make sure the provider is running and a connection is open (via IPC or RPC). When I specify: --rpccorsdomain "http://...
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27 views

How to create wallet for any cryptocurrency? [closed]

I want to create wallet for any cryptocurrency so how can we create it ? Can we leverage ethereum blockchain by some way?
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1answer
11 views

Ethereum Private network security concerns

Looking for some answers alongside resources that point out those answers Background: I am a intern at a mortgage company and need help regarding a write up with their security concerns Questions: ...
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1answer
30 views

Need help Need help

Good evening. Need help. a hack has entered my account. when I get some payment. it sends to another in 30 seconds. I need to get My Tokens out of this wallet .. Is there any way? Is there any way I ...
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1answer
31 views

How to make a multi node ethereum private network

I'm trying to build a private network that is composed of 2 nodes. Each of the 2 nodes have to deploy a smart contract and to transact the other contract. The problem is that I'm confused about the ...
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1answer
19 views

Why is the gas limit dropping in my private network once my local node connects?

I have a private network consisting of a "Ethereum proof-of-work consortium" on Azure and my development pc. In azure there are 2 mining nodes and one transaction node. All on Ubuntu virtual machines ...
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0answers
69 views

Can race conditions occur in PoA network?

I have the following contract deployed on my PoA network with two sealers, node1 and node2. Let's assume a user, user1, submits a transaction with call to process() method to node1 and another user, ...
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1answer
16 views

Initial Genesis difficulty on an ethereum clone

I've created an ethereum clone that i hope someday can become a public blockchain. This is working good so far, however i have a question regarding the initial setup for once i set this live. If i ...
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0answers
15 views

Is it logical to use “Proof-of-Authority” for a “public” blockchain?

According parity.io website: Proof-of-Authority is a replacement for Proof-of-Work, which can be used for private chain setups. And also: The chain has to be signed off by the majority of ...
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2answers
41 views

Mining in private network not giving ether to coinbase account

I am relatively new to Ethereum. I was trying to set up a private test network. I used the following genesis file: { "config": { "chainId": 15, "homesteadBlock": 0, "eip155Block": 0, "eip158Block": ...
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0answers
14 views

Who Execute Transaction in PoA

In PoW, every full-nodes executes contracts of a block to confirm that the miner was doing honest work. What about in PoA (proof-of-Authority)? a. Only authorities will execute the contracts to ...
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1answer
22 views

Quorum privateFor visibility

Our current project requires that the recipients of a private transaction are unknown to the rest of the network. So my question is: is the privateFor field dropped before sending the transaction to ...
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1answer
18 views

Update private chain from homestead to byzantium

I need to update my the version of my chain from homestead to Byzantium. Who can tell me how to do it? thanks.
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0answers
9 views

eth-netstats and eth-net-intelligence-api communication mechanism

How does eth-netstats work with eth-net-intelligence-api internally? To run https://ethstats.net/ like monitoring dashbard in Ethereum Blockchain we need to run eth-netstats and eth-net-intelligence-...
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3answers
113 views

Ethereum Deployment Problems

I deployed a private version of Ethereum on my laptop. I am using this code to deploy: geth –-identity "blockdb" –-rpc -–rpcport "9040" --rpccorsdomain "*" –-rpcapi "db,eth,net,web3" –-datadir "c:\\...
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1answer
17 views

Accessing older blocks from Geth: Returned error: missing trie node 94d34

When my Nodejs script uses web3 to query a geth node running in a private Ethereum network for an older block, I encounter the error UnhandledPromiseRejectionWarning: Error: Returned error: missing ...
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1answer
37 views

invalid argument 0: hex string without 0x prefix

In order to get a list of transactions by account address I used the following code snippet - function getTransactionsByAccount(myaccount, startBlockNumber, endBlockNumber) { if (endBlockNumber == ...
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0answers
10 views

Refresh Peers from `static-nodes.json` Without Restarting geth

When running geth on a private Ethereum network, is it possible to edit the list of enodes in static-nodes.json and make geth pickup any new enodes in the new version of static-nodes.json without ...
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2answers
61 views

Quorum Private Transactions: Why public key instead of address?

Out of a combination of curiosity and frustration, I'm trying to figure out why Quorum requires a node's public key when using "privateFor". Wouldn't it be easier to use addresses? I am wondering if ...
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0answers
24 views

“Invalid JSON RPC response: ”" when sending TX very quickly to geth. Pending TX being removed

In order to test the TPS of a private network, I have a script that signs and submits 400 transactions which sends ETH from one account to another account. This network has it's block gas limit set ...
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0answers
15 views

Implement Blockchain in money movement system for keeping Transparency into the system

I have current system, which act as a hub and spoke matching platform between – 1) issuers and dealers, and 2) advisors and accredited investors. But still lack of transparency is one of the pain ...
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14 views

Contract not deploying from etherbase node in private network

i created a private blockchain network.one is node 01 where i am not start mining and another node is i use for mining which is node 02.when i am sending transaction or want to deploy a contact from ...
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1answer
26 views

Where to place static-nodes.json for geth

I am setting up a private Ethereum network using puppeth whic creates the sealer nodes on various servers. To aid peer discovery, it has been suggested that we include a list of enodes in the file ...
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1answer
25 views

Unnecessary mining [duplicate]

Short Question: Why is my node mining? Long Question: I just deployed Ethereum using the following information: Genesis code { "config": { "chainId": 7654321, "homesteadBlock": 0, "...
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0answers
16 views

Calculate Private Proof-of-Authority TPS [duplicate]

With a private Ethereum Proof-of-Authority network set up containing 3 sealer nodes, what can we do to estimate the TPS (Transactions per second) of the POA network?
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33 views

Why when i restarted my computer and entered to my private blockchain i lost all my ether?

So, I successfully setup a private blockchain in my laptop and mined around ~3000 Ether (no market value). Also deployed a smart contract. Everything was fine, but, when the next day I opened my Mist, ...
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1answer
61 views

How to list an erc20 token in an exchange site?

An erc20 token has been smart contracted in MyEtherWallet(Ropsten) and verified & published in etherscan.io. I want to list this token in an exchange I've built. Can I do it by installing a ...
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0answers
55 views

Best Method to Increase TPS on PoA Blockchain

In creating a PoA blockchain where a high TPS is needed, how will you define the genesis.json configuration? There will be sealer nodes on opposite ends of the globe with ~ 0.1-0.2 second latency. ...
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0answers
18 views

Get performance measures from my private blockchain

I would like to get the performance of my private blockchain and I am not sure how to get the measures (as latency or the time of execution of a contract). Is it possible through Truffle or Geth?
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1answer
35 views

How to write an ethereum smart contract to pass data among two computers only?

I have written a simple smart contract. I'm running it using rinkeby testnet. But the problem is that any machine can access and see the data. But I need only to send the data to a specific machine( ...
2
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1answer
50 views

Private Ethereum Node connection with Metamask

I am able to connect using metamask localhost 8545 option, as well as computer within the intranet. geth --identity "SK" --datadir data --networkid 18 console --rpc --rpcport 8545 --rpcaddr "0.0.0.0" ...
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1answer
244 views

Error in Ethereum Wallet:“Couldn't estimate gas, resorting to default parameters. Transaction is likely cheaper than the estimate”

I am using ethereum wallet for deploying contracts in my private blockchain. But whenever I try to send a transaction in my ethereum wallet it shows an error that says, "Couldn't estimate gas, ...
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1answer
66 views

Storing structured data in private blockchain

The task. Develop distributed registry on blockchain network that can store public data of the certain objects. For example: { "id": 123456789012345, "title": "Big black box (not more than 100 ...
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1answer
18 views

How to define miners ACL on a private chain

is there a way to manage "allowed" miners in ethereum private chain ? the idea is to have some sort of access control list of miner addresses which are allowed to seal a block. in case the above is ...
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1answer
17 views

Is it possible for a node in the blockchain to create a separate blockchain of it's own?

It is clear that a blockchain can be created by an organization consisting of certain authorized nodes. In a similar way is it possible for the nodes in the same chain to create a blockchain ...
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1answer
54 views

Help with setting up Private POA(Clique) Ethereum Network

Geth Version : 1.8.12-stable-37685930 Testing on Amazon EC2 t2.large(8GB RAM) machine with Ubuntu 16.04 running. I am in need of setting up a multi node private POA(Clique) ethereum network. ...
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1answer
42 views

adding new peer to quorum dynamically

I've three boxes quorum setup running on AWS and i wanted to dynamically add a node to this setup so i added enode of that node along with ip in static-nodes.json of all boxes and started the node but ...
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0answers
9 views

Why is my gasLimit kept on decresing by itself?

I have setup a private blockchain which nobody is connecting to it except me and my team. From time to time I will get failure with error message "exceeds block gas limit". Googled and found that I ...
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0answers
19 views

addPeer() to Ethereum system with different IP address (connect with Google cloud)

I try to make now a private Ethereum system but can not add peers to it. I tried with static-node.json and with Javascript console (admin.addPeer). The problem is that I installed miners on google ...