Adam Back Says One Bitcoin Mistake Could Cost Traders Again

Blockstream CEO Adam Back says crypto keeps repeating the custody failures that destroyed FTX and Mt. Gox. His Bitcoin advice cuts against the noise. Separate trading from custody, skip leverage, and HODL through every downturn.

Back speaks from experience. By his own account, he lost coins in the Mt. Gox bankruptcy after redepositing funds to chase a 10% arbitrage spread that proved to be a risk premium in disguise.

The Custody Mistake Crypto Refuses to Fix

In a Blockstream interview at BTC Prague 2026, Back argued that both collapses shared a common flaw. Exchanges held customer funds while trading against them.

The cost of that flaw compounds for years. Mt. Gox lost about 850,000 BTC in 2014, and its Japanese bankruptcy trapped creditors for nearly a decade. Its estate still moves markets, and a $739 million transfer in June helped push Bitcoin below $70,000.

FTX repeated the pattern in 2022. Its creditors received a $2.2 billion fourth round of repayments in March 2026, more than three years after the exchange failed.

Back sees progress, though. Institutional traders increasingly demand trilateral agreements, which park assets with independent custodians while exchanges extend trading credit. If a platform fails, he noted, possession is nine-tenths of the law.

Adam Back’s Bitcoin Advice for a Volatile Market

For individuals, the prescription is blunt. Keep long-term holdings in self-custody, and never borrow against bitcoin to buy more. That trade, Back warned, carries a surprising liquidation risk because the collateral and the asset fall together.

Successfully timing markets is difficult for a similar reason. Back estimates that roughly 12 trading days deliver each year’s gains, so sitting out is costlier than it looks.

“The problem is it’s very very hard to time these markets or to second guess them… being out of market is like palpably dangerous.”

Back said this while defending the HODL strategy, which began as a drunken misspelling on a 2013 forum. By his count, he has held through three 85% drawdowns, earning the nickname “cucumber” for staying cool.

Bitcoin’s current price near $63,681, up 1.5% in 24 hours, sits just above the 200-week moving average. Back placed that average near $61,000 and treats it as the asset’s dependable value floor.

Back is betting his own capital on that conviction through his pending BSTR bid. The open question is whether exchanges adopt custody separation before the next stress test, or whether the old playbook runs again.