Satoshi Nakamoto's Bitcoin Stash: Post-Quantum Shift Could Reveal Accessible Holdings, Says Adam Back Blockstream CEO Adam Back suggests that a future post-quantum migration for Bitcoin could clarify the amount of Satoshi Nakamoto's estimated 500,000 to 1 million BTC that remains accessible. Owners protecting vulnerable holdings will need to move them, offering insight into what remains under control. Adam Back, CEO of Blockstream, speaking at Paris Blockchain Week, posited that a future migration of Bitcoin to a post-quantum cryptographic standard could potentially reveal the true extent of Satoshi Nakamoto's remaining accessible holdings. Back estimates Nakamoto's stash to be between 500,000 and 1 million Bitcoin. The core of his argument rests on the necessity for owners of vulnerable Bitcoin holdings to move their assets to a new, quantum-resistant address format. Such a migration, Back explained, would likely provide ample opportunity for users to transfer their funds. Consequently, any coins that remain unmoved after this anticipated process could reasonably be considered lost or inaccessible. This proposed shift to a post-quantum address format, according to Back, will serve as a crucial indicator of how many of Satoshi's coins are still under active control, as owners would be compelled to migrate them if they wish to safeguard their assets from potential quantum threats. He elaborated that this migration would address coins held in quantum-vulnerable address formats, including older coins whose public keys have already been exposed through transactions. Back emphasized that Bitcoin developers and coin holders are not facing an immediate threat, stating that a quantum breakthrough capable of compromising Bitcoin signatures is estimated to be at least two decades away. He characterized current quantum computers as significantly less powerful than a basic calculator and pointed out that their inherent limitations, such as immense energy consumption, become more pronounced as these systems scale. This considerable lead time, Back argued, should be sufficient for developers and users to devise and implement a post-quantum strategy, facilitating a transition to a new quantum-resistant standard that leverages hash-based signatures. Blockstream, under Back's leadership, has been instrumental in exploring and proposing solutions for this future challenge. A prominent suggestion involves the adoption of a hash-based signature scheme, which offers a promising avenue for securing Bitcoin in a post-quantum era. This approach is envisioned as a quantum-safe alternative to the Elliptic Curve Digital Signature Algorithm (ECDSA) and Schnorr signatures, both of which are currently integral to Bitcoin's security framework. The proposed hash-based signature scheme would base its security entirely on hash function assumptions, mirroring the foundational principles already employed within Bitcoin's existing network design. ECDSA, the current standard, relies on elliptic-curve cryptography to ensure the authenticity and integrity of digital transactions. Schnorr signatures, another widely recognized scheme, are lauded for their potential to enhance transaction privacy and reduce data overhead through their capability to consolidate multiple signatures into a single, more efficient representation. The development and implementation of such quantum-resistant measures are vital for the long-term viability and security of the Bitcoin network, ensuring its resilience against future advancements in computing power. Cointelegraph remains dedicated to fostering independent and transparent journalism, adhering to its Editorial Policy to deliver accurate and timely news. Readers are encouraged to conduct their own due diligence and verify information presented in this article