Bitcoin developers have proposed BIP-361, which aims to freeze tokens in addresses vulnerable to quantum attacks.

CoinFeed reported on April 15th, citing Cointelegraph, that six researchers in the field of Bitcoin quantum security, including Jameson Lopp, have proposed BIP-361. This proposal suggests freezing tokens in quantum-vulnerable addresses on the Bitcoin network, including approximately $74 billion worth of Bitcoin held by Satoshi Nakamoto, to prevent theft once quantum computers mature. This proposal is the second part of a three-phase "post-quantum migration and old signature deactivation" scheme. The first phase, BIP-360, was proposed in February, introducing a new P2MR output type to protect new tokens. According to BIP-361, three years after activation, sending Bitcoin to old-type addresses will be prohibited; five years after activation, old signatures will become invalid, and Bitcoin in vulnerable addresses that have not been migrated will be frozen. The third phase provides a zero-knowledge proof rescue mechanism, allowing users who missed the deadline but possess the mnemonic phrase to recover their funds.