- BOS has launched Grail Pro, a protocol for turning unused institutional Bitcoin into working capital.
- Grail Pro uses programmable tokens to allow institutions to earn yield on Bitcoin while keeping custody control.
- A pilot program minted 100 zkBTC tokens, showing how Bitcoin can be moved into lending and DeFi without leaving custody.
- About six million Bitcoin, worth roughly $693 billion, now sit idle under custody due to counterparty risk concerns.
- Grail Pro uses a cosigner system and zero-knowledge proofs to strengthen security and prevent fraud.
BOS launched its Grail Pro protocol in London, aiming to help institutions use idle Bitcoin for earning potential without giving up control. The protocol creates programmable tokens from institutional Bitcoin reserves, making it possible to deploy these assets while keeping them secure.
The new protocol, described as “custody-grade,” enables custodians to mint tokens that remain fully backed by their Bitcoin holdings. According to BOS co-founder and chief executive Edan Yago, Grail Pro is designed to meet the needs of institutions and to address the growing demand for digital asset treasuries.
A recent pilot involved partners locking Bitcoin to mint 100 zkBTC tokens, which are verifiable using zero-knowledge proofs and transferable 1:1 with native Bitcoin. This pilot demonstrated how idle Bitcoin can be used in lending, trading, or other decentralized finance strategies without requiring custody to be relinquished. “Bitcoin was designed to reward early adopters and long-term holders,” Yago told Decrypt.
The protocol targets approximately six million Bitcoin, valued around $693 billion, currently held by custodians but not actively used because of concerns about counterparty risks. Many of these holdings are kept in digital asset trusts or reserve accounts, as outlined in a recent Gemini.com/strategic-bitcoin-reserve”>report from Gemini.
Grail Pro differs from traditional bridge models by requiring each minting or release request to be approved by institutional cosigners and verified by at least 16 independent operators using zero-knowledge proofs. This process is intended to reduce fraud risks and ensure continuous institutional custody. The system also supports programmable financial products, customizable vaults, and real-time monitoring.
BOS described Grail Pro as part of its push toward “BTCFi”—using Bitcoin in decentralized finance applications. This approach aims to move institutional crypto holdings from speculation to broader capital markets. Yago highlighted the benefits of “supranational assets” like Bitcoin, which he said offer stability independent of specific government or regulatory environments.
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