Multisig might. "To complete the Coinbase Vault offering, we will be adding multi-signature (“multi-Sig”) technology in the coming weeks to enable customers to

Multisig might. "To complete the Coinbase Vault offering, we will be adding multi-signature (“multi-Sig”) technology in the coming weeks to enable customers to manage their own vault security." It's not clear exactly how that will work, but if it's, say, 2-of-3 and Coinbase only holds one of the keys then it would.