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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1answer
192 views

pyethapp is unable to add transactions to blockchain

I'm using pyethapp and web3.js to make transactions on a private network. var to = "1152a50b91887591a2447b233105f392dbae72ce"; var from = "4dfd7cb92bca796821d5fc4512a6a02cc98d833d"; var json_data = {...
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1answer
283 views

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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1answer
67 views

Raiden network and publicity

As I understand, privacy on of the key features or Raiden. Let's say that I want fast transactions but at the same time I want to have the transparent transactions history for an independent observer,...
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3answers
1k views

Is there a way to make geth only allow connections from specified nodes?

I'm setting up a private network with 10 geth nodes for my organization's own use, however I don't want outside nodes to accidentally (or intentionally) connect to our geth nodes. The nodes are hosted ...
3
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1answer
515 views

Is there any GUI to see the chain from ldb database: view blocks, wallets, etc?

Is that true: files with *.ldb = LevelDB files? So i looked for LevelDB GUI managers and launched some of them to look through my local test chain: levelui (can't launch) Keylord (launch but get ...
3
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1answer
981 views

Ethers.js - missing signer

I'm working on ethers npm package and after instantiating wallet, I'm trying to transfer some tokens to the address. but it is throwing out an error missing-signer. Do anyone know, what mistake I ...
3
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1answer
140 views

Geth additional condition for valid blocks in private network

Using Geth and a private blockchain, is there any possibility to specify an additional condition for a block to be valid? In particular, I want to accept only blocks that are mined from miners that ...
3
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1answer
2k views

What does the extraData field of a block represent?

I am trying to save some data into a block. The extraData field has a constant value since block 1. Also where does the data parameter of sendTransaction() function get stored?
3
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1answer
326 views

Is there any way to diffuse the difficulty bomb and continue operating as though Ice Age doesn't exist?

I am running a private chain for my own purposes. Rather: it's a "public" discoverable chain but not any known or publicized chain. I want to continue to run this with PoW and no difficulty bomb. ...
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2answers
1k views

Parity private blockchain, gain ether

I started parity node in dev network using this command parity --jsonrpc --jsonrpc-port 8180 --chain dev --author * --geth the author is the address of my parity node client and then I start mining ...
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2answers
758 views

How to mining using GPU in private chain?

Sir, We build a Ethereum private chain for one application.We use geth to mine and find the performance is not good. Geth use CPU to mine.So,what method I can use to mine using GPU? Barkely
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1answer
318 views

Private network, Geth, receipt not found for transaction 0x

I started a private network with Geth. Geth 1.5.9-stable, Windows 10. Here is My genesis.json: { "nonce": "0x0000000000000042", "timestamp": "0x0", "parentHash": "...
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1answer
208 views

Custom mining rewards

Is it possible to give custom mining rewards or provide custom transaction fees for mining in a private chain? I am looking to create a contract which will reward the miners with data instead of / in ...
3
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1answer
730 views

Is there any way to white list ethereum node peers by public key and ip?

Is there anyway to set (white-list?) your Ethereum node's peers by public key and ip address? I'm specifically playing around with a private network right now, but this should be relevant to the ...
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0answers
38 views

Blocks can't contain more than 81 transactions

I'm building a private blockchain with Parity clients. For performance testing, I'm submitting many identical transactions. One of the nodes has a GPU miner attached. There are 2 issues I cannot ...
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0answers
3k views

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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0answers
45 views

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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0answers
50 views

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 ...
3
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1answer
75 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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0answers
1k views

Get RPC URL / IP of Metamask's current provider

Suppose I have multiple copies of the same dapp running on different servers which do not directly communicate with each other, for testing purposes, and can manually interact with different dapp ...
3
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1answer
71 views

Understanding what happens between transaction creation and block creation in Proof of Authority

I am currently writing my thesis where I'm investigating the potential of blockchain technology to become the underlying technology in a system that is create and record qualifications. I'm at the ...
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0answers
136 views

Quorum :- metamask do not support privateFor feature of quorum

i got to know that metamask do not support privateFor because of which private transaction for quorum dapp was not behaving as expected. so, I can't use metamask for my quorum DApp to switch port and ...
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0answers
130 views

Miner accepting 0 price transactions

I am hosting a private blockchain and I am testing out the Geth functionality. I have deployed a Solidity contract based on the Greeter example. The functionality is not important, but suffice to say ...
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0answers
485 views

Private Net: Miners not mining pending transaction

I am running a private network. I send a lot of transactions to geth with miner on (with 10 threads). I could see my transactions getting mined properly for some time. And then I checked length of ...
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0answers
72 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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0answers
149 views

Is it necessary to have the UDP port open for an Ethereum private net?

An Ethereum node requires both TCP (listener) and UDP (discovery) port (usually 30303) open and reachable by other nodes. My question: is it possible to run a private network with my node only ...
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0answers
113 views

Proof of Authority Finalisation

Are there uncles/orphaned blocks in a PoA-based network? How do we reach consensus which is the real chain if the chain is splited/ we have a fork? Do you know any possible attack vectors on such ...
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1answer
1k views

Remix error “gas required exceeds allowance or always failing transaction” on private blockchain

I'm trying to test contract interaction using Remix with two basic contract: contract Callee contract Caller Callee function/variable: uint[] public values; function storeValue(uint value) { ...
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2answers
205 views

Mining, Ethers and Private Blockchain DAPPs

I am building a private Blockchain cluster DAPP envisaged to have 5 to 10 parties owning their own nodes (or node clusters). At this moment, there is no specific mandate to incentivize miners, though ...
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0answers
114 views

What would cause nodes on a private blockchain to gradually lose connectivity?

I have a private blockchain with 6 nodes, and a total of three miners. When I initialize the blockchain everything looks great and the nodes find each other starting with the bootnodes. After about ...
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0answers
397 views

Can't establish the connection with bootnode and two nodes

I have problem with starting my private network. Two nodes on different PC and with external IP addresses, starts with next parameters: --verbosity 3 --identity "TestNet" --rpc --rpcport "8081" --...
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0answers
372 views

How does a token crowdsale or ICO work for a permissioned Blockchain project?

Filecoin, for example, ran their highly successful ICO on the Ethereum blockchain, though they are gonna operate on a different chain. AFAIK, main-net tokens can't be used on a private chain. Makes ...
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0answers
133 views

Geth private chain hashrate lower on higher versions

Using Geth I am running a private development chain (locally) with one node, starting it as follows: geth --networkid 12321 --datadir=".embark/development/datadir" --password config/development/...
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1answer
1k views

How can I bridge public and private blockchains or smart contracts?

I want to create an ERC20 based token for an upcoming ICO and bridge this somehow with our private blockchain. Creating the token was easy enough and I can do this part. The team plan to get the ...
3
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0answers
350 views

SSL Support for Communication Between Geth Nodes

We are using private Ethereum network for a multi entity use-case. The problem is that all these entities geth nodes sits behind a firewall which only allows TLS traffic. The node that's broadcasting ...
3
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0answers
138 views

Not able to successfully do transactions of default MetaCoins(from Truffle) on local testnet on MetaMask

I have installed truffle and ran the default contract provided by truffle. I successfully compiled,migrate and put the default dapp on local testnet http://localhost:8080/.I am able to see the dapp ...
3
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2answers
89 views

Private network with limit supply

I'm just wondering if is possible to create a private network (Not development) with this characteristics: Max supply One account has all the supply already Nodes/peers can't mine Gas cost is always ...
3
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1answer
160 views

Creation of a whitelist in a private network with Rinkeby Clique PoA?

I'd like to create a private network where I would limit the creation of smart contracts to a whitelist of accounts. Is there any option for this?
3
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1answer
708 views

Regarding external file storage

Let's say you have a private blockchain, a DApp with an workflow to store and retrieve data from that blockchain. Now there is a need to store binary files and access it in a permissible way. One way ...
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0answers
109 views

Wallet on private chain not watching contracts?

I set up an ethereum private chain for testing smart contracts a while back. Recently, I've been unable to deploy and interact with contracts successfully. Here is what used to work: 1) I created a ...
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0answers
1k views

etherwallet-3.4.2 on private chain invalid sender error

In order to use etherwallet in private chain setup, I completed following Use Your Own Server Guide, answer_1 and answer_2. I have added Custom Node and MyEtherWallet works , except sometimes it ...
3
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0answers
243 views

Cannot create a second account on my private chain from the Ethereum Wallet

Just playing around with Ethereum. I create my very first private-chain on a Windows machine.. First I'm starting up the node/miner: D:\ethereum\gethlatest>geth --dev --rpc --rpcport 8002 --...
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0answers
568 views

Private network with 2 servers on scaleway

first of all thank you for the great discussions and solution that I've found here. I'm trying to create a private ethereum network to which I want to access with 2 different servers. I am able to ...
3
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1answer
933 views

Connect ethereum node on host machine to docker cluster in VM

My setup is as follows: Windows host machine running an Ubuntu VM using virtual box. On the Ubuntu VM i'm running a private ethereum cluster using docker. This is working fine. I'm connecting them ...
3
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0answers
323 views

not able to mine transactions generated on remote node

i have connected two nodes locally on my private testnet using admin.addPeer() I0829 16:33:25.280649 eth/downloader/downloader.go:320] Block synchronisation started I0829 16:33:27.187839 core/...
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0answers
126 views

Using Mix IDE on a private testnet?

Is it possible to run/debug contracts in mix-ide on a private test net?
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0answers
62 views

Effectively debugging pyethapp

I have also asked the technical details of pyethapp's use of gevents here. I'm trying to run a transaction step by step in a debugger and see how it is being signed and added to the blockchain. I am ...
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0answers
459 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 ...
2
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1answer
562 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"...
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1answer
4k 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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