High-profile tech experts have signed a letter asking congressional leaders to apply a skeptical eye to the exploding crypto industry.

The letter, published Wednesday and addressed to Senate Majority Leader Chuck Schumer, Senate Minority Leader Mitch McConnell, Speaker of the House Nancy Pelosi, and House Minority Leader Kevin McCarthy, among others, comes from 26 industry leaders including Harvard’s Bruce Schneier and Google Cloud principal engineer Kelsey Hightower.

The tech experts' question states that “crypto-assets are an innovative technology that is unreservedly good” and instead urges lawmakers to “take a critical, skeptical approach” toward crypto.

“We urge you to resist pressure from digital asset industry financiers, lobbyists, and boosters to create a regulatory safe haven for these risky, flawed, and unproven digital financial instruments and to instead take an approach that protects the public interest and ensures technology is deployed in genuine service to the needs of ordinary citizens,” the letter reads.

It argues that the crypto-asset industry “in any way suited to solving the financial problems facing ordinary Americans” narrative is “peddled by those with a financial stake” in its success.

Although cryptocurrencies witnessed continuous dramatic crashes, the sector still has a total market value of $1.27 trillion, according to CoinGecko, with Bitcoin — the largest crypto by market cap — accounting for $562 billion in market capitalization. 

The signatories write that “not all innovation is unqualifiedly good” and say that “the history of technology is full of dead ends, false starts, and wrong turns.”

They added that blockchains are “poorly suited for just about every purpose currently touted as a present or potential source of public benefit” and call it “a solution in search of a problem.”

They want lawmakers to make sure that people “are not left vulnerable to predatory finance, fraud, and systemic economic risks in the name of technological potential which does not exist,” saying that crypto assets are often used in “unsound and highly volatile speculative investment schemes” that trick retail investors “who may be unable to understand their nature and risk.”

The letter arrives as Senators Cynthia Lummis (R-Wyo.) and Kirsten Gillibrand (D-NY) are set to introduce their Crypto Oversight Bill, which Lummis told CNBC last week “creates a regulatory for digital assets which ... hits the sweet spot between regulation that is clear and understood and does not stifle innovation.”