Shadow Key Attack: a fundamental threat of nonce leakage in Bitcoin transactions from the EUCLEAK mechanism via side channels of the Extended Euclidean Algorithm in YubiKey 5 devices and Infineon microcontrollers RAMnesia Attack: A Scientific Investigation of WireTap Threats to Bitcoin Infrastructure, Hardware Vulnerabilities (CVE-2025-6202, CVE-2023-39910), and Cryptanalytic Methods for ECDSA Key Recovery Phantom Signature Attack: An Analysis of the Critical Vulnerability CVE-2025-29774 in the Bitcoin Protocol, SIGHASH_SINGLE Implementation Flaws, and the Mathematical Framework for Private Key Recovery in Lost Cryptocurrency Wallets Enabling Unrestricted Control over BTC Assets RingSide Replay Attack: Recovering the SEED → deriving Bitcoin wallet private keys and how 32-bit entropy instead of 256-bit led to the systematic compromise of crypto-asset funds Scalar Venom Attack: A critical HSM initialization vulnerability (CVE-2025-60013) enables private Bitcoin wallet key recovery through buffer overflow exploitation and shell metacharacters in the F5OS-A FIPS security module