First Regulated Yen Stablecoin Audited By Quantstamp

March 8, 2021
Quantstamp Announcements

Quantstamp audited GYEN, the first regulated Japanese yen (JPY) stablecoin issued by GMO-Z.com Trust Company (“GMO Trust”),  a subsidiary of financial and IT conglomerate GMO Internet Group (“GMO Internet”), and powered by Ethereum. Users can trade GYEN at Liquid. In addition to GYEN, Quantstamp also audited ZUSD on behalf of GMO Trust.

GMO Internet is a market leader in Japan for internet infrastructure and many online businesses. In 2020, GMO Internet received over 200 billion yen in revenue.

Regulating Stablecoins

GMO Trust prioritized getting its stablecoins properly regulated. GMO Trust received the coveted BitLicense from the New York State Department of Financial Services. In order to be approved for the trust, GMO Internet had to meet stringent requirements for its cybersecurity programs, as well as meet federal standards for anti-money laundering and economic sanctions.

The mainstream adoption of stablecoins is impossible without a clear regulatory framework. Historically, the blockchain industry lacked regulatory clarity which led to increased risk and uncertainty for well intentioned businesses. Recently, regulatory clarity in the US has improved after the Office of the Comptroller released this letter in January. The letter clarified that banks can:

The clarity provided by the Office of the Comptroller is likely to contribute to more banks benefiting from the faster settlement times and composability enabled by blockchain technology.

Securing the Financial Infrastructure of Tomorrow

Banks and other financial institutions are finally embracing blockchain-based innovations due to increasing regulatory clarity, insured custodial solutions, and quality security services. Quantstamp will continue working with international companies like GMO Internet, NGOs such as the World Economic Forum, and governments like Dubai in order to educate them about CBDCs, and help them produce stablecoins and other blockchain-based applications.

Quantstamp looks forward to continuing to provide the secure foundation necessary for the world to safely transition to the future of finance.

Quantstamp Announcements
March 8, 2021

Quantstamp audited GYEN, the first regulated Japanese yen (JPY) stablecoin issued by GMO-Z.com Trust Company (“GMO Trust”),  a subsidiary of financial and IT conglomerate GMO Internet Group (“GMO Internet”), and powered by Ethereum. Users can trade GYEN at Liquid. In addition to GYEN, Quantstamp also audited ZUSD on behalf of GMO Trust.

GMO Internet is a market leader in Japan for internet infrastructure and many online businesses. In 2020, GMO Internet received over 200 billion yen in revenue.

Regulating Stablecoins

GMO Trust prioritized getting its stablecoins properly regulated. GMO Trust received the coveted BitLicense from the New York State Department of Financial Services. In order to be approved for the trust, GMO Internet had to meet stringent requirements for its cybersecurity programs, as well as meet federal standards for anti-money laundering and economic sanctions.

The mainstream adoption of stablecoins is impossible without a clear regulatory framework. Historically, the blockchain industry lacked regulatory clarity which led to increased risk and uncertainty for well intentioned businesses. Recently, regulatory clarity in the US has improved after the Office of the Comptroller released this letter in January. The letter clarified that banks can:

The clarity provided by the Office of the Comptroller is likely to contribute to more banks benefiting from the faster settlement times and composability enabled by blockchain technology.

Securing the Financial Infrastructure of Tomorrow

Banks and other financial institutions are finally embracing blockchain-based innovations due to increasing regulatory clarity, insured custodial solutions, and quality security services. Quantstamp will continue working with international companies like GMO Internet, NGOs such as the World Economic Forum, and governments like Dubai in order to educate them about CBDCs, and help them produce stablecoins and other blockchain-based applications.

Quantstamp looks forward to continuing to provide the secure foundation necessary for the world to safely transition to the future of finance.

Keep up with Quantstamp and the latest industry trends 🛡
Sign up to our newsletter 📬
Keep up with Quantstamp and the latest industry trends 🛡
Sign up to our newsletter 📬
Quantstamp Announcements

April 2026 Security Beat: Same Actors, New Targets

April was undoubtedly a rocky month in security. $635M was lost across 28 crypto incidents. The Axios npm package was compromised on day one, exposing an estimated 600,000 installs in three hours. Vercel was breached through a third party. Three major CVEs under active exploitation. Here's the month in security 👇

Read more
Quantstamp Announcements

The Exploit Race

Web3 is different from “normal software” for one brutal reason: bugs turn directly into money. In 2025 alone, an estimated $3.4B was stolen through crypto exploits. That incentive creates a uniquely hostile environment where attackers systematize vulnerability search.

Read more
Quantstamp Announcements

Engineering Smart Contract Families for Solidity

Decentralized applications (dApps) (e.g., DEXes) increasingly span multiple Ethereum-compatible chains, such as a number of L2s. Although these chains are intended to be compatible with the Ethereum Virtual Machine (EVM), subtle differences in opcode implementations can significantly alter smart contract behavior and security. This poses an important question: how can developers efficiently code and manage smart contracts targeting different chains?

Read more