A report by a16z crypto titled "Quantum computing and blockchains: Matching urgency to actual threats" indicates that the likelihood of a cryptographically relevant quantum computer (CRQC) capable of breaking current public-key cryptography emerging this decade is very low. The report highlights the immediate threat posed by "harvest now, decrypt later" (HNDL) strategies to encrypted communications, urging the deployment of hybrid post-quantum and classical encryption methods. For blockchains like Bitcoin and Ethereum, the primary future risk is signature forgery rather than historical decryption.