Daily Crypto Briefs 
NEW YORK, April 9, 2026
Bitcoin developers rolled out two fresh quantum-resistance wallet prototypes on April 8 and April 9, including a no-softfork design from StarkWare researcher Avihu Levy and a zk-STARK recovery path from Lightning Labs CTO Olaoluwa Osuntokun, as bitcoin traded near $72,255 and the market around Satoshi Nakamoto’s coins stayed steady.
The development gives Bitcoin something the quantum debate has mostly lacked so far: wallet-level recovery demos instead of only abstract protocol arguments. It also pushes the story beyond an earlier draft quantum fix, which focused on a new output type rather than a direct rescue path for already-created wallets.
Odds of Satoshi moving any of his Bitcoins have gone up from 4.5% at the beginning of the year to a peak of 11.8% and now a stable 9%, but this week’s prototype news has not affected the market’s pricing yet.
Will Satoshi move any Bitcoin in 2026? Live
Dormant Satoshi-era coins remain the symbolic center of the quantum story. A spike there would suggest traders think the risk has shifted from long-term engineering work to a more urgent catalyst. That did not happen on April 9.
The new prototypes arrived only days after Google’s quantum warning tightened the industry debate, yet the Satoshi contract stayed flat enough to suggest traders still see this as preparation work rather than a live wallet event.
Market snapshot: Bitcoin traded at about $72,255 on April 9, up roughly 1.0% over 24 hours and about 5.0% from the start of the two-week window below, while market capitalization stood near $1.45 trillion and 24-hour trading volume near $33.9 billion.
Bitcoin (BTC) price: 2-week snapshot
BTCBitcoin quantum wallet prototypes target exposed Taproot funds
In his April 8 Bitcoin Development Mailing List post, Osuntokun proposed a way for BIP-86 wallets to prove knowledge of their original seed with a zk-STARK. In plain language, that means a wallet could prove it controls the secret that created a Taproot address without revealing the secret itself, which is the kind of exit path developers have struggled to describe concretely.
That proposal is aimed at a specific corner of the problem. BIP-86 is a common Taproot wallet setup that intentionally commits to no visible script path, so if Bitcoin ever disables vulnerable key-path spending in response to a quantum threat, those wallets would otherwise be stranded. Osuntokun’s post framed the prototype as a way to avoid that dead end rather than as a full replacement for Bitcoin’s signature system.
Levy’s April 9 QSB paper takes a different angle. In the abstract shown in a screenshot shared with Daily Crypto Briefs, the StarkWare researcher describes a modified scheme that replaces the non-quantum-safe signature component with a hash-to-sig puzzle based on RIPEMD-160 pre-image resistance and says the construction fits within Bitcoin’s legacy script limits of 201 opcodes and 10,000 bytes. If that holds up under wider review, it points to a recovery transaction that could be assembled under today’s limits without changing the base protocol.
Google quantum paper keeps pressure on Bitcoin developers
The urgency comes from Google’s March 30 arXiv paper, which said secp256k1 could be attacked with less than 1,200 logical qubits and, on superconducting systems, fewer than half a million physical qubits. In a related research blog post, Google said future machines may break crypto with “fewer qubits and gates than previously realized,” a framing that changed the tone of the Bitcoin conversation almost immediately.
Google separately said on March 25 that it is targeting a 2029 post-quantum migration timeline for its own systems. That does not set Bitcoin’s deadline, but it does show how large security teams are already treating the issue as a planning problem rather than distant theory. Some recent Wall Street commentary has also framed the response window in roughly three to five years, which helps explain why prototype work is starting to look urgent rather than optional.
That is why these prototypes matter even before they become production tools. Bitcoin’s hardest quantum problem is no longer only choosing an ideal signature scheme on paper. It is giving exchanges, custodians, and ordinary wallets a migration route that can work under real script constraints, with real users, before the hardware window closes further.
What remains unclear is whether Osuntokun’s approach can be compressed enough for broad wallet use, whether Levy’s no-softfork construction will get public code and deeper peer review, and whether the wider ecosystem converges around BIP-360 or another migration path. Those are the next signals to watch if the market around Satoshi’s bitcoin is finally going to move on something more concrete than theory.
Stay up to date
Get the latest crypto insights delivered to your inbox
Primary sources and further reading
Fact-checked by: Daily Crypto Briefs Fact-Check Desk
Frequently Asked Questions
Did Bitcoin just become quantum-safe?
No. The April 8 and April 9 work are prototypes, not activated Bitcoin consensus rules or widely deployed wallet upgrades. They matter because they show more concrete recovery paths than the earlier debate had offered.
What did Olaoluwa Osuntokun propose?
Osuntokun proposed a zk-STARK based way for BIP-86 Taproot wallets to prove seed knowledge and recover funds through a post-quantum safe exit path if Bitcoin ever disables vulnerable key-path spending.
What does Avihu Levy's paper claim?
The April 9 QSB paper says a modified transaction scheme could replace the vulnerable signature component with a hash-based puzzle that fits within Bitcoin's current script limits, allowing a quantum-safe spend path without a soft fork.
Has the market repriced Satoshi's bitcoin because of this news?
Not yet in any dramatic way. The Polymarket contract on Satoshi moving coins held at about 9% on April 9, which suggests traders did not treat these prototypes as an immediate catalyst for dormant coins to move.
How is this different from BIP-360?
BIP-360 proposes a new Pay-to-Merkle-Root output type to reduce long-exposure quantum risk for future transactions, while the latest prototypes focus more on emergency recovery and migration paths for wallets that already exist.