PANews reported on April 15 that, according to Cointelegraph, six researchers in the field of Bitcoin quantum security, including Jameson Lopp, have proposed BIP-361, suggesting freezing tokens in addresses on the Bitcoin network that are vulnerable to quantum attacks, including approximately $74 billion worth of Bitcoin held by Satoshi Nakamoto, to prevent them from being stolen 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 migrated will be frozen. The third phase provides a zero-knowledge proof rescue mechanism, allowing users who missed the deadline but still possess the mnemonic phrase to recover their funds. The proposal authors call this a "private upgrade incentive," arguing that freezing tokens will increase the value of other people's tokens. The proposal has sparked controversy in the community, with critics calling it "authoritarian and confiscative," arguing that forcing upgrades and invalidating old expenditures lacks justification.