Adam Back: 107 BTC Sent to Burn Address an ‘Accidental Quantum Bounty’

On May 26 five transactions sent a combined 107 Bitcoin (BTC) to the well-known burn address 1111111111111111111114oLvT2. Blockstream CEO Adam Back posted on X, “accidental quantum bounty?” in response to the transfers.

The burn address has no known private key, so coins sent there are effectively irrecoverable under current cryptographic methods. The recent 107 BTC adds to more than 403 BTC already held at that address across more than 146,000 prior transactions.

The address’s structure makes its public key mathematically derivable. That fact is the basis for the theoretical concern: a sufficiently powerful quantum computer could, in theory, compute the corresponding private key and spend funds at the address. Back highlighted that possibility in his X post and has been part of public discussion on preparing Bitcoin for potential quantum threats throughout 2026.

Blockchain records show the May 26 transfers as normal outgoing transactions that directed funds to the permanent burn address. The motive for sending those 107 BTC to a burn address was not apparent in the on-chain data.

The event ties into ongoing assessments of quantum risk for Bitcoin. One investment firm has outlined five stages of quantum risk and estimates roughly $480 billion of Bitcoin could be at long-term risk because private keys for those coins are associated with publicly visible key material. That category includes coins at known burn addresses and other addresses with exposed key material.

Researchers have published findings suggesting Bitcoin may require fewer qubits to break than earlier models assumed, which reduces the theoretical window for when such an attack could become practical. In April, Back urged optional quantum-resistant upgrades for Bitcoin over measures like forced wallet freezes, contributing to the technical debate about how to respond if quantum hardware advances.

Whether the 107 BTC remain inaccessible or could be claimed in the future depends on the pace of quantum hardware development and whether researchers can turn theoretical attacks into practical methods. Under current cryptographic standards the funds at 1111111111111111111114oLvT2 are inaccessible.