Blockstream’s CEO Says Satoshi Knew Something Ethereum’s Founders Did Not. Ethereum’s Own Researcher Just Told Holders to Prepare for Bunker Mode.

Blockstream CEO Adam Back believes Satoshi Nakamoto, the enigmatic creator of Bitcoin (CRYPTO:BTC), understood distributed systems better than the team behind Ethereum (CRYPTO:ETH). This assertion comes the same week that Ethereum Foundation researcher Justin Drake advised significant Ethereum holders, on October 7, 2026, to prepare for what he terms “bunker mode.” These two viewpoints stem from the ongoing debate over the potential risks quantum computers pose, which could theoretically crack private keys from their corresponding public keys. Although quantum machines have yet to achieve this, the timeline for such advancements remains uncertain. This raises the question: does Bitcoin offer better protection against these quantum threats than Ethereum, or does the difference become negligible when considering actual wallet usage?

Why Bitcoin Keeps Keys Hidden Longer Than Ethereum

Every cryptocurrency wallet begins with a private key, a secret number that authenticates transactions and ultimately proves ownership of the coins. From this private key, a public key is generated, which then creates an address through a one-way hashing function. Because this process is irreversible, knowing the address alone does not reveal the public key behind it.

Bitcoin operates on an output-based model. Here, coins are stored as distinct pieces called outputs, each locked to a specific address—like sealed envelopes filled with cash. The public key associated with most addresses remains concealed until the owner initiates a transaction, because signing the transfer requires revealing the key. A well-designed wallet then directs any leftover funds to a new address, leaving the recently exposed key linked to an empty envelope.

In contrast, Ethereum employs an account-based model. This system functions more like a bank account, where one address maintains a running balance and is reused for multiple transactions, staking deposits, and app interactions. As soon as an address sends any amount, its signature exposes the public key, which remains visible for the account’s lifetime. An address that has only received funds keeps its key hidden, but few wallets stay inactive for long.

In practice, a prudent Bitcoin user reveals their key only for the duration of a transaction’s confirmation, while a typical Ethereum user may expose it for several years. This longer exposure gives potential attackers more opportunity to exploit the keys, forming the technical foundation of Back’s argument.

Back’s Argument Holds Only for Bitcoin Holders Who Follow the Default

Back’s claim is backed by sound technical reasoning. Bitcoin’s structure protects most coins by locking them to a public-key hash and allows the creation of fresh addresses at no cost. This default design keeps keys hidden by default. Conversely, Ethereum’s creators opted for a straightforward account-balance model that made it easier for smart contracts and applications to read, but accepted longer key exposure as a trade-off. When looking strictly at the exposure time, Bitcoin’s default structure appears to offer a safer option.

However, not all holders follow this default approach. According to Michael Gutkin from Fireblocks, approximately one-third of Bitcoin is already stored in wallets where the public keys are exposed. For these coins, Back’s theoretical protection doesn’t apply, since the keys it was meant to keep hidden are already public.

This exposure often stems from user behavior. Many individuals and businesses reuse a single address for receiving payments repeatedly. Once they spend from that address even once, the remaining coins are tied to a public key that becomes visible. Additionally, the earliest Bitcoin outputs, including those mined in the network’s early days, utilized an outdated format that revealed the public key from the outset.

Ethereum Researchers Are Openly Discussing the Quantum Risk

On Ethereum, the atmosphere is quite different. Drake’s “bunker mode” message was advice for large holders, urging them to stay on guard. Ethereum co-founder Vitalik Buterin later commented that while the situation deserves “attention but not panic,” he acknowledged the concern’s importance without dismissing it.

A project whose researchers openly debate key exposure shows a level of transparency that contrasts with one that stays silent. Ethereum’s history of modifying its protocol through scheduled upgrades could make it easier to implement future changes regarding how accounts sign transactions. In comparison, Bitcoin operates with a deliberate approach to change, prioritizing caution—something Back values.

Both communities, however, agree on one crucial point: each blockchain’s cryptographic protections remain intact. Thus, Back’s assertion and Drake’s warning both represent ongoing discussions about the future safety of their respective networks.

Which Is Safer From Quantum Computers, Bitcoin or Ethereum?

In conclusion, while Bitcoin’s design may better protect holders who follow default practices, user behavior and wallet management narrow the gap. As discussions continue and technologies evolve, the debate over which cryptocurrency is safer from quantum threats remains open.

Contact [email protected] for any questions or corrections.