What Wallet does Coinbase use?

I'm curious to know, could you elaborate on the type of wallet that Coinbase utilizes for storing their users' cryptocurrencies? As a platform that has gained significant traction in the crypto space, I'm interested in understanding the specific security measures and technology Coinbase employs to safeguard their clients' digital assets. Additionally, I'm wondering if Coinbase offers any insights into the wallet's architecture or if they provide any transparency regarding their storage practices.