Revolutionary Bitcoin Proposal Enables Satoshi Nakamoto to Verify Control Without Transferring Funds

The specter of quantum computing has long posed a challenge for Bitcoin, with a significant portion of the problem centered around the enigmatic Satoshi Nakamoto. Millions of bitcoins, including approximately 1.1 million attributed to Nakamoto, currently valued at around $84 billion, are stored in outdated wallets with exposed public keys, rendering them susceptible to theft by powerful quantum computers. The obvious solution involves implementing a soft fork that would eventually disallow transactions from these legacy addresses, thereby forcing holders to transition to quantum-resistant formats before potential attackers can derive their private keys. However, this proposal, put forth by prominent developer Jameson Lopp and five other developers through BIP-361, creates a new dilemma, as it would require dormant holders like Nakamoto to publicly claim their assets or risk losing access. Dan Robinson, a general partner at Paradigm, has proposed an alternative solution, dubbed Provable Address-Control Timestamps, or PACTs, which enables holders to timestamp proof of ownership without publicly revealing their identities or transferring funds. This approach involves generating a random salt and utilizing BIP-322 to produce a proof of ownership, which is then bundled with the salt and timestamped on the blockchain via OpenTimestamps. If Bitcoin implements a soft fork that freezes quantum-vulnerable coins, the protocol could include a rescue path that accepts a STARK proof, demonstrating the holder created their commitment prior to the existence of quantum hardware. The holder can then submit this proof when they wish to spend their coins, and the network will release the funds without revealing any information about the address, amount, or original timestamp. While PACTs address a specific gap in BIP-361 and provide a potential solution for wallets derived through BIP-32, they require Bitcoin to adopt a STARK verification protocol, which would necessitate a separate soft fork with broad community consensus. Ultimately, the success of PACTs hinges on the willingness of holders, including Nakamoto, to create these commitments, as they cannot be retroactively generated. By offering a potential middle ground, PACTs may help mitigate the binary choice between protecting against quantum theft and respecting dormant property rights, but the question remains whether Nakamoto will utilize this solution.