Questions tagged [private]

The tag has no usage guidance.

6
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1answer
640 views

Read private data of smart contracts from Blockchain

Is there any way to read smart contracts private or internal data from Blockchain? The smart contract data is on Blockchain so probably the data can be read from servers. Is data encrypted on ...
3
votes
1answer
150 views

How secured are private data stored on blockchain?

I'm quite new in Ethereum world and I'm still little bit confused about this: If I store any data on blockchain, is it readable from anyone? Let's say I have this is Solidity: ... string private ...
3
votes
1answer
418 views

Setup PoS private network

I need to setup PoS private network with Casper and I cant find any official manual how to do it. There are only couple links which uses this git repo: https://github.com/karlfloersch/docker-pyeth-dev ...
2
votes
0answers
313 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 ...
1
vote
2answers
213 views

How to restrict access to a function to the owner of the contract only?

I am trying to modify the contract function type to endorse the fact that ONLY the owner of the contract can verify if a Company has done the payment of 2 Ethers required. I tried with the following ...
1
vote
1answer
128 views

How do i make an ERC-Token Private or have a Ring signature like monero?

I'm currently building an erc token on the Ethereum blockchain. My goal is to make a token that has some sort of functionality that makes it private like Monero's Ring Signature. Is there any way to ...
1
vote
2answers
22 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 ...
1
vote
1answer
38 views

What are the correct steps to make connection and communication within one Node by creating Private Network in windows?

What are the correct steps to make connection and communication within one Node by creating Private Network in windows? Installation of Geth is done in windows successfully, puppeth is also running. ...
1
vote
1answer
484 views

Inspecting private variables of a contract

In the solidity documentation, it is written Everything that is inside a contract is visible to all external observers. Making something private only prevents other contracts from accessing and ...
1
vote
1answer
23 views

Update Private Ethereum node

Now suppose I created my private blockchain using ethereum over any cloud, created dapps over it and created my own crypto over that. Now if ethereum update consensus to POS from POW I want my private ...
1
vote
0answers
18 views

Calling private function from external - where are referenced type parameters stored in the end?

Let's assume we have something like: contract C { function externalFunction(uint256[] calldata data) external { privateFunction(data); } function privateFunction(uint256[] memory data)...
1
vote
0answers
21 views

Private net Miner/Coinbase account changed

I set a Private net with Geth. and use miner.start() to mine blocks. my default account is 0x59a4155889e72de7846da695672d87f0e6da7332 in the keystore folder. PROBLEM: before 3000 blocks, the block's ...
1
vote
1answer
37 views

ENS Domains and new receive addresses for privacy

Currently I use a new receive addresses every time I receive ETH - Ledger Live creates new receive addresses by default when an address has been 'used' as this is good practice in terms of privacy. ...
1
vote
2answers
29 views

Unable to create a private chain

I am trying to create a private chain. this are my details { "nonce": "0x0000000000000042", "mixhash": "0x0000000000000000000000000000000000000000000000000000000000000000", "difficulty": "...
1
vote
0answers
61 views

How to make my token in private network exchangeable? [duplicate]

I am recently creating a token in my private network and want my DAPP users to exchange the token within the network. But at any point of time, i want my users to exchange the tokens they have for ...
0
votes
1answer
41 views

Private Variable [duplicate]

Question1: If I declare a private variable and put in personal information (if I did not create a getter function), does anyone have a way to see this information?
0
votes
2answers
327 views

Encrypt data using public key

I have three data fields in a form which will return a string. I would like to hash the value of these three strings and store it in the blockchain. However the data in these three strings is ...
0
votes
1answer
37 views

I've created a private blockchain with geth and curious if this ether is real and spendable? [duplicate]

I have a small private network which generates roughly 20,000 ether daily.. I read of this private network configuration often and it seams like people are actually using this Ether as real ether that ...
0
votes
1answer
51 views

Safe for random number?

My thought is that we come up with a random number in one block and make it private so no one can see it. The timer will allow a few blocks to be mined and then the revealNumber function allows the ...
0
votes
1answer
47 views

Incorrect Usage. flag needs an argument: -rpcaddr = Ethereum private blockchain

I'm trying to make Ethereum private blockchain. But facing a error while running this "geth --nodiscover --networkid 42 --datadir .ethereum/ --unlock 0x526d8a6baa472da27215f748236af96bc9f256d7--mine ...
0
votes
1answer
314 views

Private Key Storage in Metamask Chrome

I recently treated myself to a fresh install of Ubuntu, however did not separately back up my keys from metamask. I still have the old .config/google-chrome folder however from my home directory. I've ...
0
votes
4answers
445 views

Mining ether on Private Blockchain

If I create a private blockchain using Geth and mine ether using mine.start() in my account, the ether that is mined, is it real or just test ether ?
0
votes
0answers
6 views

Header broke chain ancestry , Synchronisation failed, dropping peer

Why i get these errors and what does these mean? Header broke chain ancestry , Synchronisation failed, dropping peer
0
votes
1answer
27 views

Private Company Network

I've got some questions regarding coonecting 2 ethereum nodes (geth) between two different networks: e.g. company A and company B. First, I've already connected two different nodes within the same ...
0
votes
2answers
36 views

Accessing private variables using assembly

I would like program an oracle service which I would like to charge a fee for. Therefore, I would store the data of interest as a private variable in my oracle contract. This private variable should ...
0
votes
1answer
42 views

Quorum Can a non permissioned node change the states of private contract if the node knows contract addr and ABI?

I have ran the quorum-example, deploying a private contract. https://github.com/jpmorganchase/quorum-examples/tree/master/examples/7nodes I followed the commands written in README. However, I'm quite ...
0
votes
1answer
22 views

Stop Data mining on Private Blockchain running on Etherrum platform

We have setup a private blockchain platform using Ethereum and we are using Java based UI layer for it. Can we stop mining process as it is taking lots of time and making the transactions slow?
0
votes
1answer
28 views

Not a function but function is there in solidity contract

I have a function called function addUser(address pubkey) public { } However when calling this function in the node backend contract.methods.addUser(address).call().then(function(...
0
votes
1answer
76 views

How to set default gas limit for my custom private network?

I've connected to my custom private ethereum network in remix with web3 provider. Everything was fine, account balance, and address was retrieved successfully. But I don't know why, but I could not ...
0
votes
2answers
316 views

How to transfer ERC20 tokes from Blockchain wallet to MyEtherWallet?

I got some token and by mistake sent them to my Blockchain ETH address. Now, what is the process of transferring them to MEW? They talk about exporting your private key, what does that mean and to ...
0
votes
1answer
22 views

part of private blockchain disapear

I have a private blockchain, mined by one ec2 instance. When I restart the instance, significant part of the chain disappear with all transaction and contracts on it. How can I prevent this?
0
votes
1answer
142 views

Quorum private transaction is being reverted by EVM

I had setup an quorum network using quorum maker (3 nodes). I tried to perform a public transaction and it worked. But when I tried to perform a private transaction it gets reverted by the EVM node:...
0
votes
0answers
13 views

Eth on unlocking auto transfers

Facing a weird issue on geth console on my private network. So, I was trying to unlock an account so that my web3 can access it. As soon as I unlocked, all my ethers just vanished in seconds.. I could ...
0
votes
2answers
38 views

Windows 10 private net can't connect to the other peers, geth: 1.8.11

System information: Geth version: Geth/1.8.11-unstable OS & Version: WINDOWS10 I modified the main net Genesis config parameters in DefaultGenesisBlock in genesis.go, and I replaced the ...
0
votes
1answer
171 views

Private Ethereum Chain and Web3 js API

I've developed my own private chain for testnet using geth and CLique and i have some issues with web3.js environment. I starts my nodes using the console parameter in order to get to the Web3 console ...
0
votes
1answer
147 views

A problem in building a private network using Ethereum

There is a problem in in building a private network using Ethereum. Geth version : 1.8.3 stable OS & Version : windows 10 My scenario is as follows: The genesis block is as follows { "...
0
votes
1answer
344 views

missing ether after uninstalling metamask

Lost my ether from Metamask when I uninstalled it and it did not show up when reinstalled...but it is showing on Etherdelta with the no private key error in red. How do I recover it please? I'm leery ...
0
votes
1answer
122 views

Lost Private key [duplicate]

I lost my private key and can not access to my account to send coin. I still hold my MEW address. So please help me with this case
-1
votes
0answers
6 views

Ethereum Private network . Commit new minning work stuck

I am trying to build an ethereum private network. Here is my genesis.json file { "config": { "chainId": 15, "homesteadBlock": 0, "eip155Block": 0, "eip158Block": 0 }, "nonce": "0x0000000000000042", "...
-1
votes
1answer
1k views

I got this problem in my private ethereum blockchain(Node is not syncing, Node data write error ,Synchronisation failed, retrying)

I am new to ethereum and right now getting the ethereum blockchain using geth with geth --port 3000 --networkid 58342 --rpc --rpcport 8545 --rpcaddr 10.0.0.2 --rpccorsdomain "*" console INFO [03-...
-4
votes
1answer
358 views

best language for creating private blockchain? [closed]

I am not being able to figure out, which lang is best for creating a private blockchain?