Wallet addresses are safe to display anywhere you would like to accept tips, payments, or donations. It is not possible to steal digital currency with a public address alone. The only way someone could access your funds would be if they had access to your Coinbase account, or in the case of a non-hosted wallet, your private key.
Public Key (Public address)
Similar to how an email can be given out to anyone to receive messages, a wallet address can be given out to receive payments. You can view all of your receiving addresses here.
Much like one needs the password to an email account to be able to access and send a message from that email address, wallets have what is called a private key that is needed to send funds from a digital currency wallet.
Coinbase is a hosted wallet service, which means we manage your private keys for you, securing your funds with a password, device confirmation and 2-factor authentication. We take security very seriously at Coinbase and utilize our secure cold-storage technology to protect our customer's funds. As a result, we are unable to provide access to your private keys unless you are using our Multi-Sig Vault.