Researchers recently identified vulnerabilities in cryptographic signatures for Bitcoin, Ethereum, and Ripple, that allowed attackers to calculate private keys and, consequently, steal any crypto in that wallet.  Vulnerabilities only occur in edge cases where code is not implemented by developers properly, or likely occurred because of faulty multi-signature hardware. The research emphasizes the resiliency of the cryptographic schemes used by cryptocurrencies, as well as highlights the importance of proper implementation (Mitchell Moos, 2019).