Update: Appears to be an automated response from Coinbase.

Hi there,

A hard fork event of the Bitcoin network on August 1st of 2017 created two separate blockchains: Bitcoin (BTC) and Bitcoin Cash (BCH).

Coinbase has always supported Bitcoin (BTC), but we have recently announced full support for Bitcoin Cash (BCH). Bitcoin Cash (BCH) is a different digital asset than Bitcoin (BTC).

You will only be eligible for a Bitcoin Cash credit if you had a Bitcoin balance on Coinbase or GDAX at the time of the August 1st hard fork.

You will now be able to send and receive Bitcoin Cash (BCH) on Coinbase. We hope to enable trading of Bitcoin Cash (BCH) on GDAX and Coinbase very soon. At the time of this email, trading has not yet been enabled.

Please avoid sending BCH to a BTC address, or BTC to a BCH address!

Please see our blog post for more information: https://blog.coinbase.com/buy-sell-send-and-receive-bitcoin-cash-on-coinbase-65f1b2c7214b

You can also live chat with our automated customer support rep, Ada, here: https://coinbase.ada.support/chat/ – Ada can help answer basic questions, keep you up-to-date with current site issues, and assist with website navigation. Ada is always learning and improving!

Thanks for your understanding, and thanks for your patience with us as we grow with the digital currency community.

Regards,

Kyle
The Coinbase Team