StarkWare stated researcher Avihu Levy examined an experimental quantum resistant Bitcoin transaction on mainnet. It’s reported that the TX spent a ten,000-satoshi output in block 964,199 with out altering Bitcoin’s consensus guidelines.
Bitcoin Completes First Quantum Resistant Transaction
StarkWare (@StarkWareLtd) says it has accomplished the primary quantum resistant Bitcoin bitcoin:native transaction.
The tactic makes use of signature grinding to restrict publicity whereas transactions wait in Bitcoin’s mempool. It repeatedly… pic.twitter.com/UJlsofzjq7— BSCN (@BSCNews) August 27, 2026
StarkWare described it as the primary transaction of its type. MARA Pool mined the block after receiving the transaction straight via its Slipstream service, for the reason that nonstandard format meant bizarre nodes wouldn’t relay it via the general public mempool.
StarkWare spokesperson Nathan Jeffay stated the transaction price round $150 to $200 in computation, and StarkWare stated the method took hours. The demonstration reveals a technique to defend a single output underneath Bitcoin’s present guidelines, however at a fabric computational and operational price.
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How StarkWare Quantum Bitcoin Transaction Works
Levy’s Quantum-Secure Bitcoin (QSB) scheme, first proposed in April, combines hash-based one-time signatures with computational searches that bind authorization to a particular transaction. The development is meant to stop forgery even when a sufficiently succesful quantum pc breaks the elliptic-curve cryptography utilized by Bitcoin.
In March, Google researchers estimated {that a} sufficiently succesful quantum pc may theoretically derive a Bitcoin non-public key 9 to 12 minutes after a public key turns into seen. Google stated this might enable an attacker to exchange a pending transaction throughout Bitcoin’s affirmation window.
Levy’s April proposal estimated that producing a transaction would require $75 to $150 in GPU computation; StarkWare put the price of the finished transaction at round $150 to $200.

QSB applies to particular person Bitcoin transactions moderately than upgrading cryptography throughout the community. It permits cash to be moved into an output with extra safety with out altering the Bitcoin protocol, nevertheless it doesn’t defend cash whose public keys had been uncovered earlier than migration. In that case, a possible attacker may have time to research these keys earlier than a protected transaction is distributed.
The transaction’s nonstandard classification underneath Bitcoin Core’s default relay coverage is a sensible constraint. Unusual nodes don’t propagate the transaction earlier than affirmation, so it have to be submitted on to a cooperating miner via a service reminiscent of MARA’s Slipstream. The tactic, subsequently, requires ready transactions and direct miner entry.
StarkWare CEO Eli Ben-Sasson stated QSB supplies a security web whereas protocol-level protections are developed. The demonstration establishes a workaround underneath the present guidelines, moderately than altering Bitcoin’s underlying cryptography throughout the community.
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The Protocol-Degree Different
Bitcoin builders are individually contemplating proposals, together with BIP-360, a proposed delicate fork that will introduce a Pay-to-Merkle-Root output sort whereas eradicating Taproot’s quantum-vulnerable key-path spend. That strategy would require network-wide coordination and activation.
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QSB doesn’t anticipate a protocol change. The mainnet check reveals that Bitcoin’s current consensus guidelines can accommodate one type of quantum-resistant spending, whereas broader protocol-level protections stay into account.
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