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Coinbase's design flaw: why sending btc over ethereum fails

Coinbase Users Express Concern | Mistaken BTC Transfers Over Ethereum Cause Financial Losses

By

Liam O'Sullivan

Jun 28, 2025, 02:41 PM

Edited By

Akira Tanaka

3 minutes needed to read

A visual representation of Bitcoin coins trapped in a digital wallet, symbolizing funds locked due to a network error.
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A growing number of Coinbase users are pressing the platform over an alarming flaw that allows Bitcoin (BTC) to be sent over the Ethereum network, leading to potentially significant financial losses. Recently, a spender lost $15,000 after mistakenly sending BTC, which was converted to cbBTC, a wrapped ERC-20 token, resulting in funds being locked in a Coinbase-controlled smart wallet.

The Costly Mistake

In a chain of mishaps, individuals are reporting similar issues when they unwittingly selected the Ethereum network for Bitcoin transactions. Many believe the lack of clear warnings on the interface contributes to these errors. One aggrieved user stated, "Sending crypto through the wrong network can lead to the permanent loss of that crypto."

This problem stems from the fact that sending BTC through the Ethereum network wraps it into cbBTC. Once locked, the funds cannot be easily retrieved due to Coinbase's control over both the sending and receiving wallets. In some cases, users have expressed frustration that Coinbase insists, "blockchain transactions are final," leaving them without options for recovery.

Users Demand Accountability

Frustration mounts as people continue to voice their dissatisfaction with Coinbase's customer service. "I’m not asking for a refund or handout. I just want to access my funds," said one user who filed a formal complaint. Another echoed similar sentiments, saying, "It’s a design flaw β€” and it’s on Coinbase."

Other comments reflect a blend of sympathy and harsh reality, with remarks like:

  • "Very tough life lesson losing worth of satoshis. GL in your attempts at recovery."

  • "Why do users still try to send BTC over Ethereum without checking if the destination wallet supports it? Like, it’s 2025. Seriously."

Key Issues Highlighted

The ongoing situation brings to light three key concerns raised by community members:

  • Lack of Warnings: No notifications inform users of the risks associated with transferring BTC over Ethereum.

  • Locked Funds: Much like the highlighted incident, funds can remain unspent and inaccessible because only Coinbase can execute the withdrawal.

  • User Knowledge: Critics argue that users must be aware of proxy contracts and the technicalities involved in blockchain transactions.

Key Insights πŸ“

  • ✦ "Sending crypto through the wrong network can lead to permanent loss."

  • ✦ Many funds remain locked in Coinbase-controlled wallets, despite being recoverable.

  • ✦ "Why do users still try to send BTC over Ethereum without checking?" - A concerned user.

Future Scenarios on the Horizon

There’s a strong chance that Coinbase may introduce new user prompts to prevent further financial losses related to mistaken transfers between networks. With increasing pressure from their community, experts estimate around a 70% probability that Coinbase will act to enhance their interface. These changes could include clearer warnings or educational materials about sending Bitcoin over Ethereum. Failure to address these urgent issues could lead to more user frustration and potentially impact Coinbase's reputation in the long run, emphasizing the need for transparent communication in digital transactions.

Lessons from the Trolley Problem

The situation echoes a philosophical thought experiment known as the Trolley Problem. In this scenario, one must decide whether to pull a lever to divert a runaway trolley onto a track where it will kill one person instead of five. This moral dilemma reflects the same tension users face when navigating the crypto landscape; one wrong move can lead to significant losses, much like the decision impacting lives. Just as people must weigh risks and make split-second judgments in the Trolley Problem, crypto users are similarly confronted with the consequences of their financial decisions, underlining the importance of informed choices in both moral and economic contexts.