From The Coinbase Blog.
Coinbase is reducing the number of confirmations required for several assets on the platform. We expect this change to both improve customer experience and security posture.
Why we made these changes
Confirmation requirements for assets are based on many factors. These factors change over time just like the assets themselves. To ensure a great customer experience, Coinbase continually evolves our security posture and periodically amends confirmation requirements.
For Bitcoin, Ethereum, Litecoin, and Ethereum Classic, it has been determined that confirmation requirements can be reduced. In practice, this means that deposits will be confirmed on Coinbase faster than before while still meeting a high bar for asset security.
This article came directly from The Coinbase Blog, found on https://blog.coinbase.com/announcing-new-confirmation-requirements-39449f49173c?source=rss—-c114225aeaf7—4