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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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10
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2answers
2k views

What does it mean to “seal a block”?

In both the Ethereum chain specification format and in Parity's documents on private chains, you see the term seal a block. What exactly does that term mean? How is it different than mining a block?...
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3answers
437 views

Is there a way to broadcast account addresses to other nodes in a private blockchain?

I am running a private blockchain and have a couple of geth nodes which are connected. I have multiple accounts on both the nodes. From node 1, through the admin.peers command, I can get the enode URL ...
5
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1answer
2k views

Listing transactions in a private blockchain?

In a private blockchain, is it possible to list the transactions based on from and to parameters in a transaction. Is it possible to check the latest transaction from or to an address? Also, is it ...
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2answers
480 views

Customized oracle to access and make changes to data on a cloud service

Although, there is some literature mentioning the possibilities of oracles to supply external data to smart contracts in a blockchain, I am a newb and was wondering whether there is a successful ...
9
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2answers
1k views

Accessing off-chain data from a smart contract to make a decision

I just started studying about smart contracts and from what I understand, smart contracts only deal with the data present on the blockchain. While working on a private blockchain, I want to know ...
13
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2answers
10k views

How many transactions are there in a block?

If a block acts as a ledger of transactions, how many transactions can fit in a block? I have to setup a private test net where only one machine is allowed to mine while (many) others are performing ...
6
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1answer
3k views

geth: view all current contracts on a private testnet?

How can I query a list of all current contracts with geth? Is there a way to see the contracts' class names?
5
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2answers
706 views

Is it possible to prevent nodes from mining on a private blockchain?

Is it possible to prevent mining on a closed block chain, in a sense that only a set of addresses are allowed to perform transactions but are not allowed to mine? Mining should always be done by a ...
4
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2answers
565 views

What property makes Proof of Stake easier to apply in permissioned blockchains?

There are a number of efforts driving towards the transition from the current proof-of-work towards proof-of-stake (more info here). Meanwhile proof-of-stake is already in use in some permissioned ...
6
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3answers
1k views

Private blockchain for production?

Even though it might be a bit soon for use in production, but all I find about setting up a private blockchain seems to be for testing. But the fact we have a genesis.json should mean that anyone has ...
14
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2answers
1k views

Is a fully private blockchain network immutable?

I always hear that immutability is one of the great assets of using blockchains in banks. An auditor can come and look at the list of transactions and it will trust them because blockchains are ...
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2answers
3k views

How to change to private network in etherum wallet?

How can I change to private network in the ethereum wallet. I just got two mainnet and testnet in the wallet. Appreciate your answers
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0answers
455 views

Private Ethereum blockchain to implement in-game currency--legit?

I've been toying with the idea to implement a reward system for a game on top of Ethereum. Mostly for self-study because I'm interested in blockchain technology, but also because Ethereum appears to ...
4
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1answer
275 views

Rubix vs Blockapps vs others, what are the differences in private Ethereum platforms?

What are the major differences between the different private Ethereum platforms? The main two that I am aware of are Rubix and Blockapps, what are the primary differences?
6
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1answer
167 views

Can main and test net interact?

is there direct way to make a contract on either the main or test net to communicate with a contract on the other net? This could be generalized as asking if a contract on private chain can ...
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2answers
5k views

How to query local Ethereum blockchain for a specified transaction?

I want to find specified transaction. How can I query my local Ethereum blockchain from the console?
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2answers
783 views

restricting sensitive information accessible from / linked to the blockchain?

I'm currently researching the practicalities of implementing a blockchain ledger whereby the company I work for, our competitors, our clients, our clients users (who we service indirectly) and an ...
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1answer
1k views

Data sharing on the private blockchain

Assuming that there are multiple parties on the private blockchain, few general questions on the private blockchain usage: Can Personally identifiable information (PII) data be stored on blockchain? ...
4
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1answer
417 views

Custom list of client/node for private chain - Consortium blockchains

I've been reading on making a custom private chains here , here , here,here and here . It's pretty clear how to create a custom chain and having remote client connect to the node with this : geth ...
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1answer
842 views

Communication between nodes of two private blockchains

How can the nodes on one Ethereum private blockchain send/receive transactions from the nodes operating on another private blockchain?
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2answers
638 views

How to create a secure, production ready private chain?

I'm looking for more information or resources on how to run a private chain with ethereum with multiple nodes that would work in production and would only be accessible to my users/network. I know ...
14
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2answers
5k views

Running a custom private go-ethereum node cluster using docker

Here is a set up I have been working on and am having issues with ability to create a private network with peers. Basic set up: Used the dockerfile from https://github.com/ethereum/ethereum-dockers/...
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7answers
8k views

Block explorer running on private network

Is there any application out there that allows me to explore the Ethereum blockchain in a private network? (something similar to what blockchain.info does to bitcoin or etherchain does to ethereum ...
4
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2answers
2k views

Ethereum private blockchain, Gas Limit

If I change the gaslimit in my genesis file does the network import the old blocks or only the new blocks? if it's yes how can I do it without modifying the genesis block ? I want to make the gaslimit ...
9
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1answer
1k views

How can I stop the block gas limit on a private chain dropping to the public chain default?

I've got a little private chain running which occasionally runs some rather labour-intensive transactions. I was able to set the initial block gas limit using the "gasLimit" parameter in genesis.json ...
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2answers
6k views

Deploying the Greeter contract via the geth CLI is not registering in my private blockchain

I am running a local private Ethereum blockchain using: geth --networkid 60098 --genesis CustomGenesis.json --nodiscover --maxpeers 0 --rpc --rpccorsdomain "http://localhost:3000" --datadir "./data" ...
8
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1answer
1k views

Losing connection between nodes on private network

I have 3 nodes running on a private network. After asking this question, I've manually added node1 as peer to node2 and node3, so my network looks like this: _______ ...
12
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1answer
4k views

Peer discovery not working on private network

I'm running 3 nodes with the following command: geth --verbosity 4 --autodag --nat any --genesis /opt/blockchain/genesis.json \ --datadir /opt/blockchain/data --networkid 4828 --port 30303 --rpc ...
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2answers
29k views

What does each genesis.json parameter mean?

I'm trying to setup genesis.json for my private network. What does each parameter mean and what value can I set in genesis.json? nonce: any data? timestamp: any time? parentHash: any hash? extraData: ...
4
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1answer
1k views

Creating a cluster on private network

I'm currently running geth. I have 4 nodes in my network and I'm willing to make them interact with each other. On host-01, I've run: geth --identity "Node1" --genesis /tmp/eth/genesis.json --rpc --...
4
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1answer
760 views

Connection between peers never happen on custom blockchain [duplicate]

My app connects and mine the same blokchain on every instance, it uses the same genesis.json and network ids. Genesis: https://github.com/AugustoL/OpenContent/blob/master/genesis.json Web3 service ...
19
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6answers
6k views

How to remove gas system from ethereum

I'm testing Ethereum with a complex contract which requires quite a lot of gas. And I'm testing (and will be running) a private network with controlled miners, so I don't need them getting any reward, ...
6
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1answer
2k views

Simple contract on private network is never mined

I'm trying to run the crowdsale example from the Frontier docs on a private network and local blockchain. I can create the contract, but do not seem to be able to mine it. You can see a gist of the ...
6
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2answers
2k views

How should we benchmark transaction per sec?

I'd like to compare the transaction speed of private Ethereum(ex. PoA), Eris and HydraChain. How should we benchmark them?
4
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1answer
80 views

Risk assessment - account confidentiality when signing transactions

When creating cold storage setups, I've seen various users describe running a private Ethereum chain for the purpose of confirming access to their generated accounts. I'd like to verify access to ...
15
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3answers
5k views

Mining with geth on private network hangs indefinitely

I've got a private test network running as per this article. In particular my difficulty is set to 0x400; the entire genesis file I'm using can be seen here. Mining with geth does not seem to work ...
2
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0answers
386 views

How to initialize private blockchain using flu?

I get the following error when trying to initialize a private bockchain using flu: $ sudo flu console --config ~/ppaconfig.json flu Hinted genesis block's state root hash is incorrect! flu Hinted #...
18
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1answer
652 views

Out of Gas invoking precompiled contracts on private blockchains

Why do precompiled contracts lead to Out of Gas on private blockchains? Some tidbits are provided in the Solidity docs but can it be explained more? It might be that you run into Out-of-Gas for ...
6
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1answer
1k views

How can you implement two way pegged Ethereum <-> Ethereum sidechain?

If you want to create an Ethereum sidechain which is two-way pegged to main (public or private) Ethereum, how can you implement sidechain? For example, How can you lock ether? How can you verify ...
4
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2answers
2k views

Smallest number of nodes for an Ethereum private blockchain

In a public instance, one would expect the more miners the merrier, as this improves the overall mining diversity and therefore we get better security. Private blockchains, as in the Eris case, tend ...
4
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1answer
293 views

Main use cases between Open Blockchain and Ethereum

Looking at Open Blockchain's use cases and it appears a lot of these can be done or are on Ethereum, examples: multi-sig contract activation, execution, atomicity of contract execution, reusable ...
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2answers
917 views

How can I get a private geth instance on Azure to interact with the public blockchain?

So I am referring to Microsoft Azure's new blockchain as a service Ubuntu geth instance. I've set this up no problem and have run through the tutorial, but I'm trying to think of how I would get this ...
4
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1answer
827 views

How can I check which network I'm working on?

When I start eth I get the following header: $ eth (++)Ethereum Beware. You're entering the Frontier! [...] I think i followed the instructions for working on a private network (because i just want ...
37
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2answers
9k views

Is there a (theoretical) limit for amount of data that a contract can store?

Is there a theoretical limit to the amount of data that one contract can store while running in a private net in which gas is not a concern? Context: In a financial Dapp which is to replace global ...
14
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4answers
7k views

How to run Ethereum Wallet on a custom chain?

So I downloaded the Ethereum Wallet I know you can use a custom directory by running geth first with the datadir flag set up, and then launching the wallet. But besides a custom directory, I want to ...
4
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2answers
6k views

How does the Microsoft Azure Ethereum Blockchain as a Service differ from the platform offered by Eris Industries?

On Nov 2015, Microsoft announced with ConsenSys, the addition of Ethereum Blockchain as a Service (ETH-BaaS) on their Azure platform. Meanwhile, Eris Industries also have been offering, what appears ...
2
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1answer
551 views

How do contracts interact, and how is the network secured? [closed]

I don't understand what it means when people saying things such as "(Ethereum) applications can interact with each other on the blockchain, so a library of useful functionality will gradually build up"...
8
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2answers
4k views

Getting more Ether on a private test net

I setup a local testnet using geth following these instructions. I was able to mine my initial Ether and all was working. After deploying some contracts I quickly spent all the Ether I had. Now it ...
2
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1answer
470 views

What's involved in making a private chain become a sidechain of Ethereum?

"A private Ethereum-based network that had a linkage allowing ether to be securely moved from the public Ethereum main chain onto it and back would be considered to be a sidechain of the public ...
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3answers
22k views

What is a sidechain?

The Ethereum subreddit has this post related to an Ethereum-Dogecoin sidechain. What is a sidechain? Could one sidechain be a private Ethereum network?