KEYHUNTERS

Major Cyberattack on BigONE Crypto Exchange: $27 Million Loss, Reasons for the Hack, and Comprehensive Security Enhancement Measures

Cryptocurrency exchange BigONE was the victim of a massive cyberattack on July 16, 2025, which resulted in the theft of digital assets worth approximately $27 million . The incident caused serious concern…

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CoinDCX After $44 Million Hack: Fixing System Vulnerabilities, Launching Bug Bounty Program, and Strengthening Cybersecurity Measures to Protect Users

Indian cryptocurrency exchange CoinDCX has suffered a cyberattack that resulted in the theft of $44.2 million 2 5 . The incident occurred on July 19, 2025, when attackers gained access to an internal CoinDCX…

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The Biggest Attacks in Decentralized Finance History: Breaking Down the Biggest Smart Contract and Bridge Hacks From The DAO to Cetus: How Smart Contract Bugs and Outdated Code Cause Hundreds of Millions of Dollars in Losses

The cryptocurrency industry faced record losses from hacks and fraudulent schemes in the first half of 2025, exceeding $3.1 billion, which already exceeds the total losses for the whole of…

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Digital Signature Forgery Attack: How CVE-2025-29774 Vulnerabilities and the SIGHASH_SINGLE Bug Threaten Multi-Signature Wallet Operational Methods with Fake RawTX

In this article, we will look at the cryptographic attack of digital signature forgery (Digital Signature Forgery Attack), its consequences pose a threat to the security of transactions in the…

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The New Frontier of Cybersecurity: Key Ecosystem Vulnerabilities and Cryptanalysis Bitcoin 2025: IoT Security Threat from CVE-2025-27840 Vulnerability in ESP32 Microcontrollers

In 2025, the dynamics of crypto technology development are accompanied by a surge in cyberattacks and the discovery of new vulnerabilities that test the resilience of global ecosystems. We present…

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Multi-Signatures in Bitcoin: How It Works, How to Protect Funds, How It Works, and How Leaking Private Keys Increases Fraud Risks

In this research paper, we will explore in detail how multisig works in the Bitcoin ecosystem. While multisig mechanisms used in other cryptocurrencies may differ depending on the transaction model,…

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DeserializeSignature vulnerability in Bitcoin protocol: deep cryptanalysis and risks of forging ECDSA signatures and how to protect against fake signatures in the Bitcoin network that exploit this vulnerability

This paper presents a detailed study of the DeserializeSignature vulnerability discovered in the Bitcoin network in 2023, which allows attackers to create invalid but accepted ECDSA signatures. The principles of…

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Hidden risks of multi-signature Bitcoin wallets: analysis of Copay vulnerability via SIGHASH_SINGLE attack (Digital Signature Forgery Attack) vulnerabilities such as CVE-2025-29774 and CVE-2025-29775 in the xml-crypto library and the SIGHASH_SINGLE bug in the Bitcoin protocol

This paper presents a detailed analysis of the vulnerability of the multi-signature Bitcoin wallet Copay, developed by BitPay, which created a threat to user security due to the peculiarities of…

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Bitcoin Cryptanalysis: Mechanisms and Reliability of SHA-256 in Ensuring Blockchain Security and How Future Technological Advances Will Affect SHA-256’s Resilience to Digital Signature Forgery Attacks

The SHA (Secure Hash Algorithm) family of algorithms are cryptographic functions that transform messages of arbitrary length into hash codes of fixed length, which ensures the integrity and authenticity of…

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Segregated Witness: A Key Step Towards Bitcoin Scalability And Security Is Deep Cryptanalysis. How SegWit Implementation Affects Protection Against Transaction Data Forgery

One of the most pressing issues with the Bitcoin network is its limited scalability, which is the subject of active research and development. Among the proposed approaches to improving network…

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