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Questions tagged [private]

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Blackjack - keep dealer second card hidden

I am working on a multiplayer blackjack implementation with an array of 52 cards as the deck that have a flag if they're selected or not. I'm implementing a random number generator to choose a random ...
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54 views

web3.exceptions.BadFunctionCallOutput: Could not decode contract function call getEvidence return data b'' for output_types ['string']

Solidity Code: function getEvidence(string memory _evidenceID) view public returns (string memory) { require(evidenceOwner[_evidenceID] == msg.sender); string memory evidenceHash = ...
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1answer
34 views

How get private key or password from my keystore [duplicate]

I had wallet from 2016, but i'm forget password login by keystore. Current i just had keystore, how i can get private key or password keystore? Thank so much
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52 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", "...
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1answer
29 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 ...
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20 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)...
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1answer
28 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 ...
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2answers
64 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 ...
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1answer
120 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 ...
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2answers
30 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 ...
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1answer
42 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?
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0answers
41 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 ...
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1answer
62 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(...
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1answer
136 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 ...
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1answer
63 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 ...
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1answer
51 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. ...
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2answers
621 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 ...
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1answer
199 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 ...
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1answer
25 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?
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1answer
58 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. ...
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2answers
411 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 ...
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1answer
73 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 ...
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1answer
50 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?
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1answer
194 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:...
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2answers
586 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 ...
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1answer
413 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 ...
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2answers
30 views

Unable to create a private chain

I am trying to create a private chain. this are my details { "nonce": "0x0000000000000042", "mixhash": "0x0000000000000000000000000000000000000000000000000000000000000000", "difficulty": "...
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0answers
413 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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0answers
14 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 ...
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2answers
40 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 ...
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1answer
576 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 ...
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1answer
228 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 ...
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1answer
173 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 { "...
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0answers
81 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 ...
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1answer
40 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 ...
3
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1answer
455 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 ...
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1answer
658 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 ...
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1answer
139 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 ...
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1answer
2k 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-...
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1answer
405 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 ...
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1answer
127 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
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4answers
498 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 ?
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1answer
368 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?