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Stablecoins need privacy baked in, not bolted on

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Businesses accepting payments in stablecoins on a public blockchain are making vast amounts of data available to their competitors. For the technology to really take off, a privacy-preserving solution is needed, writes Yuval Rooz, of Digital Asset.
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In December 2024, a group of German marketing researchers cracked open a digital Pandora's box. Armed with nothing more than Python scripts and publicly available blockchain data, they dissected 22.7 million stablecoin transactions, uncovering a goldmine of private business insights. 

From customer spending habits to peak sales times, average order values and share of wallet, they peeled back the curtain on eight direct-to-consumer companies. Their work exposed a startling truth: For businesses accepting crypto or stablecoins, public ledgers aren't just transparent — they're surveillance tools hiding in plain sight.

A generational breakthrough in payment efficiency is now facing a systemic privacy challenge — one that spans from individual salary leaks to enterprise-level treasury monitoring and threatens to undermine the next wave of growth and utility as global stablecoin volumes surge toward the $5 trillion mark.

The expectations for privacy, compliance and composability are no longer optional. They're foundational.

Crypto workers routinely face impossible choices when receiving stablecoin salaries. If they spend directly from their salary wallet, then they expose their income to landlords, employers, competitors or anyone who can use a block explorer.

The other option defeats the entire point of using crypto; they can route their funds back through centralized exchanges in complex multistep processes.

Privacy workarounds reveal a fundamental flaw: Users are forced to choose between financial efficiencies and the basic privacy that traditional payment systems already provide. Stablecoins on public chains have the same problem Venmo used to have — where payments were public by default. 

A simple transaction to pay for medical treatment might seem harmless until something you didn't want known is exposed to an employer, an insurance firm or a partner. Without privacy controls, that payment transaction becomes a lasting digital fingerprint — publicly accessible, tied to your wallet and traceable forever.

As much as most businesses like to keep their practices transparent, in order to keep ahead of the competition and maintain a happy workforce, there are just some things that require a level of opacity.

Businesses accepting stablecoin payments inadvertently provide competitors with free market research. With a few hours of analysis, competitors can identify their transaction timing patterns, which reveal peak sales periods, payment clustering and, in turn, expose customer acquisition strategies. Additionally, geographic analysis can show market expansion priorities.

The plea marks the beginning of the end of the case over the $50 billion collapse in May 2022 of stablecoin TerraUSD.

August 12
Smartphone with Luna logo

What traditionally required expensive corporate intelligence gathering now sits one blockchain explorer search away, easily decoded by a motivated competitor.

Even within companies, complete operational transparency is less than ideal. Startups paying remote teams in stablecoins face the "salary visibility problem," meaning that employees can view each other's compensation on-chain, creating workplace tensions that traditional payroll systems would never create.

Companies must either have uniform and transparent salary policies or accept team morale issues, which can force many to revert to legacy payment rails despite their inefficiencies.

Even the most security-conscious institutions can be caught out. Earlier this year, blockchain analysis company Arkham Intelligence uncovered previously undisclosed wallet addresses tied to Strategy (formerly MicroStrategy), exposing a further $7.6 billion in bitcoin — bringing Strategy's total identified holdings to $54.5 billion.

This occurred despite Strategy's sophisticated security measures, with its executive chairman, Michael Saylor, having previously warned that revealing wallet addresses could expose companies to long-term threats.

This leaves corporate treasurers with a dilemma. Do they adhere to traditional rails, which offer the strategic confidentiality they need but are marred by multiday settlements and high fees, or do they reap the benefits of using stablecoins, albeit at the risk of exposing pricing, treasury strategy, or sensitive investment positions?

For institutional operations looking to engage on-chain, the potential for exposure like this is a nonstarter.

These privacy risks increase exponentially as adoption grows. Imagine how this looks when you extrapolate the challenges to the trillions of dollars of daily flows across institutional capital markets.

At current growth rates approaching $5 trillion in stablecoin volume, we're not discussing future problems — we're living in the breakdown of business confidentiality in real time. 

Every on-chain payment, from individual salaries to the movement of global collateral, can violate individual privacy, create exploitable competitive intelligence and disrupt business operations.

An entire industry has emerged for bolt-on privacy solutions for public blockchains. Nowadays, there is news almost every week about an L1 or wallet provider acquiring or launching new technology workarounds or entering partnerships to try to address the challenge.

However, the very nature of building complex obfuscation layers on top of chains that were designed for radical transparency remains a barrier to success. These approaches continue to hinder widespread institutional adoption and regulatory approval.

The infrastructure decisions made today will define who scales, who stalls, and who secures trust in the next era of capital markets and payments.

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