Richie-254

PACTs Could Let Satoshi Prove Ownership Without Moving Coins
A fresh solution from Paradigm aims to protect legacy Bitcoin addresses from future quantum attacks while preserving privacy and property rights for dormant holders.
Bitcoin faces a looming quantum computing threat. Millions of BTC held in older addresses with exposed public keys could become vulnerable once quantum computers are powerful enough to crack them. This includes approximately 1.1 million BTC attributed to Bitcoin’s creator, Satoshi Nakamoto — currently worth tens of billions of dollars.
The community has been debating how to handle this risk. In mid-April, developers including Jameson Lopp proposed BIP-361, which would phase out quantum-vulnerable address types over five years and freeze unmigrated coins. While effective for security, it puts dormant holders — especially Satoshi — in a difficult position: move coins publicly or risk losing access.
Enter PACTs: A Smarter Way Forward
On May 2, Paradigm General Partner Dan Robinson introduced Provable Address-Control Timestamps (PACTs) — a new design that offers a balanced solution.
Instead of forcing coin movement now, PACTs allow holders to privately prove they control their addresses today, creating a timestamped “rescue ticket” for the future.
How PACTs Work
1. Generate Proof: The owner creates a random salt and uses BIP-322 to sign a proof of ownership without spending any funds.
2. Timestamp Privately: The salt + proof is committed and anchored to the Bitcoin blockchain via OpenTimestamps. Everything remains completely private.
3. Future Redemption: If Bitcoin activates a soft fork to freeze vulnerable addresses, the owner can later submit a quantum-resistant STARK proof showing their timestamp was created before quantum computers posed a real threat. The network would then allow spending.
Key benefits:
- No public movement** required today
- Full privacy until redemption
- Works for pre-2012 wallets (including most of Satoshi’s known addresses)
- Reduces the binary choice between quantum security and respecting old property rights
Important Limitations
PACTs are not a complete silver bullet. They require Bitcoin to adopt new STARK verification infrastructure through a future soft fork — a significant technical upgrade involving multisig, scripts, and hardware wallet support.
Crucially, this only works if the owner (or Satoshi) takes action now. If the keys are lost or Satoshi is truly inactive, no retroactive protection is possible. The coins would still face either quantum theft or a network freeze.
Why This Matters
PACTs could make the quantum migration debate far less controversial by giving legitimate dormant holders a safe, private path to reclaim their coins. It keeps Bitcoin secure against future quantum computers while minimizing disruption to long-lost or intentionally inactive funds.
Whether Satoshi — or any large dormant holder — will use this mechanism remains unknown. But the proposal offers a thoughtful middle path in an otherwise difficult trade-off.

What are your thoughts? Should Bitcoin implement quantum protection measures like this, even with the technical complexity involved? Share your views below.
Source: Adapted from CoinDesk reporting. Proposal by Dan Robinson, Paradigm.
$BTC $Jager
#jagertothemoon #jagercommunity