A Crypto Exchange Holds Your Coins Like an Unregulated Bank

Holding Other Peoples Money

When someone buys and holds cryptocurrency on an exchange, the exchange typically holds the coins on their behalf, controlling the actual assets while the customer has a claim on them. This makes a crypto exchange function much like a bank holding deposits: it holds customers assets and owes them back, and the customers trust it to keep the assets safe and return them on demand.

But unlike a bank, a crypto exchange has often operated without the regulation, safeguards, and transparency that protect bank depositors. This mismatch, holding customers assets like a bank but without the banking protections, is the central risk of crypto exchanges, and it has repeatedly resulted in customers losing their coins when exchanges failed, were hacked, or misused the assets, discovering that their claim on the exchange was worth nothing when the exchange could not or would not return the coins.

Why It Is Like a Bank

An exchange holding customer coins takes on the same fundamental role as a bank holding deposits: it holds assets it owes to customers, who trust it to keep them safe and return them.

The similarity means an exchange faces the same temptations and risks as a bank: it could lend out or misuse the assets it holds, it could fail if it takes losses, and it must be trusted to keep the assets available. But without the regulation that constrains banks, requiring them to safeguard deposits, hold capital, and submit to oversight, an exchange operating without these constraints can do things a bank cannot, misusing customer assets in ways that put them at risk, which is the source of the danger.

How Exchanges Misuse Coins

The central risk is that an exchange, holding customer coins without the constraints on a bank, misuses them, using customer assets for its own purposes in ways that put them at risk. An exchange might lend out customer coins, trade with them, or use them to fund its own operations or investments, gambling with assets that belong to customers.

This misuse is catastrophic when it goes wrong, since the exchange has used customer assets that it then cannot return, leaving customers with claims on an exchange that does not have their coins. The collapse of major exchanges revealed exactly this: exchanges had misused customer assets, trading with them or lending them out, and when the bets went wrong or customers tried to withdraw, the coins were not there, and customers lost their assets. Without the regulation requiring exchanges to safeguard customer assets separately and not misuse them, exchanges could and did use customer coins in ways that destroyed them, which is the fundamental danger of trusting an unregulated exchange to hold assets.

The Proof of Reserves Response

In response to the failures, exchanges began offering proof of reserves, attempting to demonstrate that they actually hold the assets they owe customers, to reassure them the coins are there. Proof of reserves aims to show that an exchange has the assets to back its customer obligations, addressing the fear that the coins have been misused or lost.

But proof of reserves is limited and can be misleading, since showing assets at a moment does not prove the exchange has not borrowed them temporarily, does not reveal the exchange liabilities beyond customer coins, and does not guarantee ongoing safety. A meaningful demonstration requires showing both the assets and the liabilities, proving the assets exceed what is owed, which is harder and less commonly done well. Proof of reserves is a step toward transparency but an incomplete one, since it can be gamed and does not provide the ongoing protection that regulation and proper safeguarding do. The response reflects the recognition of the problem, but it does not fully solve it, since the fundamental issue is the lack of regulation and safeguarding that would ensure the coins are always there, which proof of reserves alone cannot provide.

Toward Better Safeguards

The failures pushed the industry toward stronger protections, both through regulation requiring exchanges to safeguard customer assets properly, as banks must, and through customers moving assets off exchanges to hold themselves. The direction of travel has been toward treating exchanges that hold customer assets more like the regulated custodians they resemble, requiring them to keep customer coins separate, hold adequate capital, and submit to oversight, so that holding coins on an exchange carries protections closer to those a bank depositor enjoys.

Until those protections are consistent and enforced, the fundamental risk remains: an exchange holding your coins without proper safeguarding can misuse or lose them, and the customer bears the loss. The repeated lesson of the exchange failures is that trusting an unregulated party to hold your assets is a serious risk, which is driving both the regulation of exchanges and the caution of customers about how much to leave on them.

The Bottom Line

Crypto exchanges hold customers coins much as banks hold deposits, taking on the role of safeguarding assets they owe, but often without the regulation, safeguards, and transparency that protect bank depositors. This mismatch lets exchanges misuse customer coins, lending, trading, or gambling with them, which is catastrophic when it goes wrong, as major exchange collapses revealed when customer assets were not there. Proof of reserves attempts to reassure customers but is limited and can mislead, and the failures drove interest in self custody, holding one own coins to remove the exchange risk at the cost of the responsibility of securing them, reflecting the hard lesson that an unregulated exchange holding your coins is a serious risk.