Author Archives: Дмитрий Истратов

 

#Ledger tutorial. Ledger Nano X battery conditioning

Ledger Nano X battery conditioning is a procedure that helps wake up the battery after long storage. You took out a Nano X that had been sitting unused for several weeks or months, and now it will not turn on, will not charge, or shows a battery warning. For a lithium-ion battery after long storage, …

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Best private messengers with end-to-end encryption. Top apps in 2026

The best private messengers 2026 protect conversations with end-to-end encryption, but not every popular app is genuinely private. Many services store messages on a server in plaintext: the company that owns the service can read them, hand them over under a warrant, or lose them in a data breach. Private messengers do not. There is …

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Physical attacks on crypto holders: how to protect yourself from a wrench attack

Wrench attack is a physical attack on a cryptocurrency holder intended to force them to hand over access to a wallet. In crypto, people usually talk about hackers, phishing, and smart-contract vulnerabilities. But there is a threat that a standard wallet setup cannot stop: a person with a wrench standing at your door. Protection is …

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Why Is Polymarket a Scam? Our Investigation and Experience with the Platform

Is Polymarket a scam or just a dangerous tool? In this article, I use recent cases to explain why the platform’s market-resolution system is designed in a way that leaves the average trader losing almost every time. From May 9 to 11, 2026, a three-day “ceasefire” was in effect between Ukraine and russia, at the …

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Best ways to withdraw crypto from Binance / OKX / Bybit to a card. Is it safe?

Binance / OKX / Bybit are the exchanges most commonly used in Ukraine. The bulk of the country’s crypto turnover goes through them. The methods to withdraw crypto to card have noticeably degraded in 2026. In December 2025, Binance shut down direct card withdrawals. OKX introduced this restriction even earlier. But there are still working …

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How to set up two-factor authentication on GitHub using Yubikey?

Hello everyone! Setting up two-factor authentication on GitHub with a YubiKey is one of the most reliable ways to keep your developer account safe. Not everyone knows how to ensure this security using modern methods. And to do so, all you need is to be the happy owner of a YubiKey hardware security key for …

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Which FIDO2 Keys Are Compatible with Delta?

Compatible devices, recommendations, and common errors FIDO2 keys for Delta are the most reliable way to secure access to the combat situational awareness system of the Armed Forces of Ukraine. Delta uses multi-factor authentication (MFA), and a physical security key based on the FIDO2 standard is the most phishing-resistant method. This guide will help you …

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How to Store a Seed Phrase: 5 Safe Methods in 2026

A seed phrase is not just a set of words. It is the single key to everything you own in crypto. To every coin protected by that phrase. If you lose it — there is almost no chance of getting access back.There are white hat hackers who recover access to lost wallets — there are …

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Who is Satoshi Nakamoto? What we know about him in 2026

On April 8, 2026, The New York Times published a 12,000-word investigation by John Carreyrou, the journalist who once buried Theranos. The conclusion: the real Satoshi Nakamoto is Adam Back, CEO of Blockstream and a British cryptographer. Carreyrou says his confidence is “between 99.5% and 100%”. Back responded with a post on X: “I am …

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