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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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Can we do ethereum transaction for free on private blockchain

I am very new to ethereum Blockchain. Please give some suggestion regarding one query regarding gas fee. Can we do ethereum transaction and smart contract deployment for free on private blockchain ...
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1answer
28 views

Blockchain usage in smart home

I am currently gathering information for my thesis about smart home implementaton with a use of blockchain. The blockchain usage is a requirement from my thesis supervisor and I have huge problem with ...
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+50

Deploying contract with no cost (gasPrice 0) on private network

In order to achieve a no-coin bootstrapping of my private network I'm trying to deploy a first special contract having zero funds in owner wallet (every wallet of this private network should have zero ...
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0answers
14 views

Inconsistency after restarting EthereumMiner, using AWS Blockchain Template for Ethereum

I have deployed the AWS Blockchain Template for Ethereum stack (the ECS version). There is 1 miner and 2 clients (default stack). I realized that I don't have access to the default accounts set in the ...
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0answers
16 views

Private Chain Gas Zero [duplicate]

Is there a way to make transactions costless on a private Ethereum network? I am already limiting who can interact with the deployed smart contracts and who is a member of the network with code. I ...
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0answers
26 views

Issue calling one contract from another using Quorum

I'm using truffle and running locally with 4 quorum nodes, trying to call another contract's function, but keep getting 0 in return instead of the expected value the I get once calling the contract ...
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2answers
14 views

Private Chain Peering and Port Problem

Two AWS nodes on separate machines are trying to peer. They are listening and discovering at port 30303, when I open these ports for inbound connection they are still unable to peer; but, when I open ...
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2answers
20 views

Can't add peers outside of local machine

I am able to spin up as many nodes on the same machine as I would like and have them peered in the same private blockchain network. But when I try to use addPeer() on a separate EC2 instance, I am ...
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0answers
25 views

Private blockchain losing access to older blocks

So, my private blockchain became out of sync and one of the nodes reset to block 0 – it then synced up with the other nodes. The node that went to block 0 is the node that is providing the rpc port ...
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0answers
23 views

Private Network in node.js

When I create a private ethereum network to run tests. How this network is simulated? Is the actual Ethereum network running on it? Or is the processing power of my computer used to simulate the ...
0
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1answer
46 views

Peers not syncing on PoA private network

I've got a private network with two PoA geth nodes, with each node running on a separate machine. One node has been running for some time (in instamine mode) and has mined 6909 blocks. I've just setup ...
0
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0answers
13 views

Is there a node-static.json file for swarm node?

As far as I am aware of a static-node.json is a file for P2P geth node connection on disconnect. I have tested that and It works just fine. I was, therefore, wondering if it is possible to have such a ...
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1answer
31 views

Instant Transactions: Private vs Public Blockchain

I have been developing a smart contract with solidity. My question is related to the deployment of smart contracts. I have studied and followed answers in the following links: Main Network vs Private ...
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0answers
15 views

Adding two peers in ethereum privatenet on same machine

I am trying to add two peers in ethereum privatenet but not adding its shows peer count is 0. I run the below commands Node1: geth --identity "Privatenet1" --datadir=./Privatenet1 --networkid 1995 --...
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2answers
44 views

Create a blockchain platform to store students and its degree results on it [closed]

I would like to create a application on blockchain where i will store all students data and their results on blockchain So anyone having a idea how can i do that or is that feasible to create a that ...
1
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3answers
35 views

What mechanism to use to pay for viewing another users data on blockchain

I am new to blockchain development and following some tutorials I have created a DApp that allows a user to save and view information. Now, i want to let another user view that saved information but ...
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0answers
42 views

ethereum-bridge oracle on private network does not receive queries

I have a private network with a few nodes and I have installed ethereum-bridge to deploy an Oracle. One of my blockchain nodes is used by ethereum-bridge to deploy the oracle. The node is started ...
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0answers
24 views

API for private state

assume that I have a private smart contract between peers A and B using quorum blockchain. Then, the variables of the smart contract will be placed in the private state. My question is: Can I make ...
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2answers
48 views

Geth Proof of Authority Implementation

I have implemented PoA on private blockchain with following genesis.json. { "config": { "chainId": 1515, "homesteadBlock": 1, "eip150Block": 2, "eip150Hash": "...
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0answers
19 views

How to mine ether on private network with CPU?

I have a private ethereum network and connected my own pool to it. Now I want to test the mining process with my CPU, what are some the ethereum mining software that support CPU mining and stratum ...
0
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1answer
16 views

Private chain, metamask, accounts

I am wondering how a private chain can communicate through Metamask. My biggest concern is the HttpProvider and accounts. Aren't accounts accessed through the web3 instance? Since accounts aren't ...
1
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1answer
54 views

web3.eth.getAccounts() never resolves

I am attempting to connect the frontend of an application to a private chain through Metamask. As no web3 is injected, the following code is run const getWeb3 = () => ... ... ... ... const ...
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0answers
22 views

Proper number of confirmations in a small testnet

In a private blockchain with just 4 miners, what should be the proper number of confirmations? 24 is by default, but does it make sense? should it be just 4 (one per miner)?
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44 views

Modify number of confirmations

By default there are 24 confirmations but I am running a testnet with just 3 miners and I would like to change this number bucause it makes not sense to have 24. I have been checking ...
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0answers
54 views

Maximum amount of TX per block

Yesterday we did a test. We launched around 1500 transactions simultaneously to our test private blockchain. They all went through perfectly, all at almost the same time (with correct and consecutive ...
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0answers
26 views

Changing chain specification

We have a private network with 10 nodes actually. It's been working for a couple months now. When we did it, we set up some parameters in the chain specification that are now too small for the growth ...
0
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1answer
18 views

Is it possible to put tax lien certificates on the blockchain?

Tax lien certificates are investment vehicles issued by a county taxing authority secured by unpaid tax liens on property. Is it possible to put these assets onto the blockchain so they can be traded ...
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0answers
20 views

Ethereum fork with Ring Signature at the core layer

Today we can have Ring Signature at the contract-level. https://github.com/HarryR/solcrypto/blob/master/contracts/UAOSRing.sol I wanted to know if there is any fork or project that would like to ...
0
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1answer
30 views

How to deploy a dapp which uses multiple blockchain

I am a newbie and started learning dapp on ethereum. Up till now, I wrote smart contracts; created frontend with html, css and js; deployed smart dapp on either private network(geth, ganache) or ...
0
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2answers
42 views

Ethereum Enterprise Blockchain

I am starting a project that I need to build a solution to track products (ex: from farm until it gets to the supermarket) Basically, I need to set up a blockchain structure for my company(private) ...
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0answers
16 views

Change name “Ethereum”, “ETH” etc. of a private chain

I'm trying to run a private chain with geth and all works properly, but how can I change the name of "Ethereum" and "ETH" and choose a new name and a new TAG? Thank you.
0
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1answer
45 views

Public smart contract that calls Private contract API

In a private blockchain (e.g, quorum), assume that I have a peer X and peer Y. X has a private smart contract (A) and Y has a public smart contract B. Assume that A provides an API for Y in order to ...
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2answers
40 views

How to skip transactional nonce for private ethereum chain

We are using a private ehtereum chain on geth. It is mainly for the purpose of storing the values as part of transactions and distribute across our private network. However when we are sending ...
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2answers
75 views

how to create genesis block on ethereum?

geth --datadir ./ init customgenesis.json Fatal: Failed to read genesis file: open customgenesis.json: no such file or directory
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1answer
39 views

Syncing private blockchain between peers

I am attempting to have a second node sync up with an original node. I had previously synced two nodes from the get-go but am unable to add a peer to an already running blockchain. In other words I ...
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0answers
15 views

How feasible it to combine Proof of Work and Proof of Elapsed time consensus to create a custom blockchain?

I wonder if it feasible to create your own custom consensus by combining Proof of Work and Proof of Elapsed time? How would I approach it? Any tools or frameworks to build it? I appreciate all the ...
0
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1answer
33 views

POA chain: intrinsic gas too low, contract deployment

I'm trying to deploy my smart contract to a private proof of authority chain with geth, but i always get the following error message intrinsic gas too low This is the JSON RPC request i'm sending. ...
0
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1answer
39 views

How do we extract the content of a hash manifest generated by swarm after a download?

As far I know, whenever we upload a file or a directory using: swarm up File we get back a hash that is the manifest containing the uploaded file. However, I am not sure I do understand how to ...
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2answers
67 views

Use private ethereum blockchain for storing data [closed]

I am new in ethereum blockchain technologies. I have some question that Is possible to use ethereum blockchain to store data (Like MySQL)..??? If yes... (for first question) have any documentation ...
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0answers
42 views

How to prevent DDOS in ethereum using PoA?

Using clique, how to prevent DDOS attack? Is there a way to set a whitelist of nodes which can send transactions, and blacklist all the others?
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0answers
83 views

Linux Geth Mining: Stuck at Commit New Mining Work in private blockchain Offline

System information Geth Version: 1.8.20-stable Go Version: go1.11.2 Operating System: linux GOPATH= GOROOT=/home/travis/.gimme/versions/go1.11.2.linux.amd64 Genesis.json { "config": { "chainId": ...
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0answers
30 views

How to read data from external files in Quorum Blockchain?

I have a use case where we have implemented Quorum Blockchain using AWS. The smart contract was written in Solidity. Initially we randomized the valued by coding in Smart Contract however we now want ...
0
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1answer
61 views

How can a peer request another peer to invoke a function from his private contract

I build a permissioned network using Quorum, I have a peerA which has a private smart contract, another peerB that cannot invoke functions of the smart contract as it is private So, can peerB send ...
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0answers
33 views

Balance from ethereum accounts on geth disappears

I have geth private network with 3 accounts A, B and C. each account has 100, 200 and 300 ether balance I connected to this network from Metamask and Transferred the balance of 50 eth from account A ...
1
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1answer
51 views

Connect different machines with PoA

i want to connect two different machines in a ethereum private network! I did it before with a normal PoW-Consesus but with PoA created by puppeth i cant see some Peers when i try: admin.peers ...
2
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1answer
41 views

Do I need blockchain to connect local database's?

Hello all and Happy New Year! My small business and my client use the same vendor application where the vendor application is locally installed at each location. Our client uses barcoding within ...
0
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1answer
34 views

Private ethereum network account related query

Please help with below queries: how to reset the paraphrase for an account on private ethereum network Is there a way to delete an account on private ethereum network How to enable the etherscan url ...
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0answers
22 views

Metamask to Private ethereum communication issue [duplicate]

When i connect to my private ethereum network using the 'Custom RPC' of the metamask, it is getting connected from the MetaMask. FYI, i am connecting from outside the network of my server, and all ...
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0answers
98 views

MetaMask to Private ethereum network connection - using Custom RPC fails

What should be the network ID (the one chosen is 3 i.e. Ropsten network) parameter in the below command in order, I want to connect with Custom RPC (which is hosting my private ethereum network) from ...
0
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1answer
51 views

Transactions on Ethereum private network using the MetaMask Ropsten test connection?

I have 4 accounts on my private blockchain ethereum network and one of the account has balance of 10000000000000000000 and other accounts have zero balance each. When I connect to this network from ...