Hex Trust—one of Asia’s leading digital asset custodian—and Tangany—an award-winning and regulated custodian in Germany—are now tzBTC keyholders. The Mechanics of tzBTC and Keyholders In a press release on Aug 12, the two custodians will become part of the Tezos ecosystem. As keyholders, their primary task will be to ensure that the tzBTC-BTC peg holds.