A new and easy project to secure Bitcoin transfers and wallets against quantum computer threats without protocol hard fork modifications

In an exciting development for the Bitcoin world, Avivoh Levy, Vice President of Technology at StarkWare, launched an open-source project on GitHub called: "Quantum-Safe Bitcoin Transactions Without Softforks." This proposal, published in April 2026, aims to protect Bitcoin transactions from quantum computer threats without requiring changes to consensus rules or software upgrades.

- The quantum threat to Bitcoin:
The current Bitcoin system relies on ECDSA signatures over the secp256k1 elliptic curve, which can be broken quickly by Shor's algorithm on a powerful quantum computer. This means signatures could be forged and funds stolen, posing an existential risk to the network.

Levy offers an immediate solution that works within Bitcoin's existing rules, using traditional signature scripts without any modifications.

- How QSB works:
The system called Quantum Safe Bitcoin (QSB) builds on the Binohash concept but shifts reliance from elliptic curves to resistance against pre-image attacks on RIPEMD-160 hash.

A public key linked to the transaction is generated, then hashed with OP_RIPEMD160 to produce 20 bytes interpreted as an ECDSA DER signature. Finding a matching hash requires searching billions of possibilities, with success probability ~2^-46, making it quantum-resistant thanks to Grover's algorithm providing a quadratic speedup (roughly 118 bits of security).

The cost amounts to $75–200 per transaction via off-chain GPU account, as an emergency measure rather than a permanent solution.

- Advantages and challenges:
QSB requires no softforks and can operate immediately on the live network without miner signaling. It also fully resists Shor's attacks, relying on RIPEMD-160 which offers 80 bits of quantum security, and is an open-source Python code available on GitHub with a detailed research paper.

One downside is its high cost (~$150 per transaction), making it unsuitable for daily use, along with the need for intensive external computation. It has not yet been tested with a full transaction on the blockchain.

- Impact on the Bitcoin community:
The proposal has gained widespread attention on Twitter and crypto platforms, with coverage from Bitcoin. and CryptoNews, considering it an "immediate quantum shield." It is viewed as an emergency measure while waiting for long-term solutions, especially as quantum computing advances.

QSB is an innovative step that preserves Bitcoin's flexibility but highlights the need for broader quantum security strategies in the future...
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