Questions tagged [ethereum]

Ethereum is a decentralized platform to run apps on a custom built blockchain.

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Proving that a file existed at a time

How do I acquire the means to prove in the future that I had possission of a file now, without relying on the integrity of a single entity? (I believe one way of doing it would be to put the file ...
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react.js security from a novice - front-end development security

I am developing a dApp for my dissertation at University. As I do not come from a computer science background, I am unsure of security risks, specifically related to the javascript front-end of my ...
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1 vote
2 answers
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How is "Smart Contract" security different?

I am learning smart contract programming on Ethereum (using Solidity) and realizing that security is highly important here. Why? Because of 2 reasons: they deal with high-stake financial transactions, ...
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Ways to encrypt data that will be available to specific clients [closed]

I want to store information on the blockchain, but some part of it is private and must be available to selected clients (for example, users who belong to a common company) How can this be done? The ...
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Use an Ethereum signature for API GET authentication

The following situation: I have a web app (stateless) Users are connected the web app using WalletConnect to connect their Ethereum Wallet. Cannot therefore not use any API keys or tokens there is a ...
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1 vote
4 answers
296 views

Where to store an important private key?

I run LEMP stack on Ubuntu 18.04. I need to sign / verify transactions for Ethereum real-time. Where can I store the private key for it? Is storing it in .env good enough? It just seems super ...
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1 vote
1 answer
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Are eavesdropping attacks possible on Ledger Nano S hardware wallets?

Regarding the Ledger Nano S hardware wallet for cryptocurrencies, I've heard it claimed that the private keys for the wallet are securely stored on the physical device and protected even if the PC is ...
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4 votes
1 answer
309 views

Why is it a bad idea to store my ethereum keyfile in my Google Drive / Dropbox etc

I just bought some Ethereum and I'm in the process of moving my ethereum off my exchange into a wallet. Now the recommendation around the web seems to be to get your key file (which contains your ...
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5 votes
3 answers
171 views

Is blockchain security dependent on number of transactions in time?

I have a basic understanding of how blockchain technologies works. I know that in depends on the ledger where are transactions recorded and can be effectivelly verified. No one should be able to ...
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2 votes
1 answer
361 views

Is the Ethereum blockchain truly a tamper-proof way to deploy distributed applications?

The Ethereum website says that it provides a "cryptographically secure, decentralized, tamper-proof network" on which applications written in the Solidity contract language could be deployed. (https://...
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4 votes
2 answers
580 views

Sandbox escape of an isolated turing complete language?

Ethereum's Solidity documentation states: The Ethereum Virtual Machine or EVM is the runtime environment for smart contracts in Ethereum. It is not only sandboxed but actually completely isolated, ...
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