Bitcoin custody platform Onramp completes $12.5 million Series A funding, valued at $135 million Bitcoin custody platform Onramp has raised $12.5 million in Series A funding, with a pre investment valuation of $135 million. This round of financing is led by Early Riders, and Onramp CEO Michael Tanguma is also a partner of Early Riders. Onramp adopts a multi institutional joint custody model, requiring multiple custodians to jointly authorize the transfer of Bitcoin assets. Its cooperative custodian institutions include BitGo, Coincover, and Tetra Trust.