Strange! Sounds like an internal ID or something. Coinbase addresses should look like normal BTC ones.
Coinbase mystery! 🕵️♂️💼🧐
Discussion
On the receipts there 5 recipients...and this is the only one i am familiar with 1KFHE7w8BhaENAswwryaoccDb6qcT6DbYY.
But the rest of the recipients starts with d-?
Like this one d-9b760287384a66dd0faf0865020cb0e4?