For the first time ever, BTC becomes fully programmable, directly on Bitcoin, through BOS. Today, BOS is proud to unveil zkBTC, which transforms bitcoin from a static store of value into productive capital. Each zkBTC is a 1:1 representation of native bitcoin, and is a groundbreaking way to get more value from BTC. It combines BOS’ advanced security solutions for Bitcoin with our unique method of adding programmable data to tokens using Charms. A big step forward has been taken today in our pilot enterprise program, with 100 zkBTC representing 100 BTC, already minted with initial partners.

Unlocking Programmability with zkBTC

zkBTC revolutionizes Bitcoin by enabling programmability without sacrificing custody. Powered by Charms, a metaprotocol using zero-knowledge proofs, zkBTC embeds smart contract capabilities into Bitcoin’s UTXO transactions. In this system, users can lock up BTC and then mint zkBTC, using Grail Pro, the institutional-grade version of BOS Grail. Unlike traditional wrappers, it lets users keep full control of their BTC while minting zkBTC for use in dApps or cross-chain workflows, all without third-party risks or moving assets offchain. 

Once minted, zkBTC becomes a verifiable token with embedded metadata—transaction history, conditions, and ownership—encoded in zero-knowledge proofs, ensuring honest minting and redemption of both BTC and zkBTC. It enables seamless cross-chain workflows without relying on third parties, eliminating custodial risks and delays. 

This allows users to activate their zkBTC through borrow, lending, exchange, or other smart contracts while maintaining the integrity of their native BTC.

zkBTC: Powering Institutional Bitcoin with Security and Flexibility

Today, major institutional and custodial entities including treasury companies, exchanges and custodians, hold approximately six million BTC (approximately USD$678 billion as of August 28, 2025), Institutional adoption is surging and here to stay. Yet, much of this capital remains idle due to the absence of secure, flexible infrastructure. zkBTC changes that, offering a transformative solution with powerful advantages:

• Uncompromised Self-Custody: zkBTC ensures your bitcoin stays in your wallet, mirrored securely by zero-knowledge proofs, giving users full control without taking on additional third-party risks.

• Endless Programmability: Unlock bitcoin’s potential for lending, trading, hedging, structured products, and innovative dApps, opening a world of financial possibilities. Embed the smart contract logic directly on your token. 

• Seamless Portability: Move zkBTC effortlessly across Charms-integrated blockchains, with Cardano already supported, Litecoin in development, and EVM compatibility planned.

• Privacy with Compliance: Zero-knowledge proofs enable compact, auditable transactions while ensuring confidentiality, meeting institutional security and regulatory needs.

zkBTC introduces a game-changing approach by embedding programmability directly into the token itself, rather than relying on smart contracts. This shift unlocks a new era of decentralized app (dApp) development. With the Charms standard, developers can create applications that aren’t tied to a specific blockchain. Instead, they design the desired logic and use zero-knowledge proofs to embed it into Charms tokens. These tokens then carry their own functionality, history, acting independently across compatible chains. This chain-agnostic model unifies liquidity, users, and ecosystems, breaking down today’s fragmented blockchain landscape and enabling seamless, innovative dApps with Bitcoin’s security at their core.

Multi-Chain, Multi-Use: Redefining BTC Utility

zkBTC redefines what Bitcoin can do, unlocking a vibrant array of use cases through its programmability and cross-chain flexibility. Powered by zero-knowledge proofs, zkBTC enables both established and innovative applications, all while preserving Bitcoin’s robust security. Here’s how zkBTC transforms BTC utility:

• Lending & Borrowing: Use zkBTC as secure collateral for loans without giving up custody or relying on third parties.

• Yield & Network Security: Dive into DeFi with yield-generating strategies or support network security through node staking, all directly from your BTC holdings.

• Private Transactions: Harness zero-knowledge architecture for confidential, programmable transactions that prioritize privacy.

• Derivatives: Build sophisticated financial instruments on top of Bitcoin, no middlemen required.

• Multi-Party Security: Embed multi-party computation or shared-key controls into transaction metadata for enhanced security.

With seamless compatibility across Charms-supported chains, zkBTC acts as a native token standard, extending Bitcoin’s reach far beyond its base layer while maintaining its unmatched security.

The zkBTC pilot program is running on the Bitcoin mainnet, with Grail Pro currently capped at 100 BTC and already fully allocated in the first stage of the pilot program. Over the coming months, the cap will progressively increase as testing scales, with the goal to release a market-ready version for full enterprise use in Q4 this year.

Bitcoin, Unbound

zkBTC marks a revolutionary step forward, unleashing Bitcoin’s potential for programmability and activation without ever leaving its native blockchain or compromising custody. With robust utility, full verifiability, and seamless integration across chain ecosystems, zkBTC is paving the way for the future of institutional-grade Bitcoin finance. As more partners join the BOS ecosystem and additional chains adopt the Charms standard, zkBTC will lead Bitcoin’s evolution into a multi-chain, programmable powerhouse.

BOS invites all interested enterprises to participate in the next stages of the zkBTC pilot program. Contact BOS at invest@remake.money.