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Questions tagged [user-safety]

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1answer
149 views

How to make user sign up and login on my decentralized application?(on production it should work without metamask)

Assuming that user who is going to signup is not having any ethereum account so how can I generate a public, private key and address for ethereum and make use of it to make further transactions. Users ...
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1answer
23 views

How expensive is it to manipulate the gas price?

Imagine that an evil billionaire decided to make Ethereum hard to use by making the gas very high. I'm wondering how expensive this would be to do for various timescales. For example, manipulating ...
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1answer
136 views

Whether Geth is safe to install?

I'm using Windows OS and is my private computer. Norton Internet Security says : Firewall rules were automatically created for geth and Intrusion Prevention is monitoring network traffic. Can ...
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2answers
17k views

What is the difference between an exchange like Coinbase and a wallet like Jaxx, MEW, MetaMask?

What is the difference between storing ether with an exchange (e.g. Coinbase, Kraken, Gemini, Poloniex, Bittrex) and a wallet like Jaxx, MEW, MetaMask?
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1answer
35 views

Is it possible to use low mining complexity to remove some certain transaction in the past?

I have a question that has concerned me for a long time. It relates to the security and reliability of the blockchain applications. Let's assume I want to build an application that uses Ethereum or ...
1
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1answer
1k views

How to user SafeERC20 from zeppelin-solidity

I am trying to utilize the SafeERC20 library from zeppelin-solidity. However the instructions for using the library are not sufficient for a novice like me . Please help me in understanding . /*...
0
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1answer
450 views

Can a smart contract transfer (steal) another contract's tokens? [duplicate]

Let's say I have an ETH address and that same address holds AAA, BBB and CCC tokens. Each token symbol is managed by a different contract (each contract was created by a different person/organization ...
1
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1answer
422 views

About security of web3.js when running inside a browser

Please explain how authentication for "protected" operations (such as withdrawal of money from a wallet) is handled in web3.js when it is run inside a customer's browser. Please also explain how it ...
0
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1answer
319 views

How safe are online private key and seed generators?

Recent news from IOTA wallets: Just two days ago, many users reported having their funds (an estimated $4 million) in their IOTA wallets stolen from an unknown source. The cause? Online seed ...
3
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1answer
1k views

How to store lots of private keys on a server?

I am building a web app where I have to keep track of a private key associated with each user. For the sake of this discussion let's assume that it's an exchange and users can send their ETH to this ...