Stacks Publishes Bitcoin Staking Whitepaper for Self-Custodial Bitcoin Yield, Backed by $500M Already Paid Out

New York, New York, May 13th, 2026, Chainwire

Proposed protocol upgrade extends Stacks' live Proof-of-Transfer mechanism to let BTC holders earn native Bitcoin yield without bridging, wrapping, or surrendering custody.

Stacks Labs today published a whitepaper outlining the first self-custodial Bitcoin Staking mechanism generating Bitcoin-native yield. The whitepaper details a proposed upgrade to Stacks’ existing Proof-of-Transfer (PoX) consensus mechanism that enables BTC holders to earn Bitcoin-denominated yield while their Bitcoin remains locked on the L1 under their own keys.

The whitepaper addresses a fundamental gap in the market: Bitcoin represents over $1.3 trillion in idle capital, yet BTC holders have had no path to earn Bitcoin yield on that capital without bridging to another chain, wrapping their BTC, or handing custody to a centralized lender. Existing approaches, including restaking protocols that require moving BTC off L1 or rely on intermediary trust assumptions, leave holders exposed to risks Bitcoin was designed to eliminate. Stacks’ Bitcoin Staking mechanism is the first mechanism where BTC stays on Bitcoin, under the holder's own keys, while generating native Bitcoin yield. The publication follows last week’s launch of the Stacks 2026 roadmap ( stacks.co/roadmap ), which laid out a three-phase plan for building Bitcoin-native finance. Bitcoin Staking is Phase 1 of that plan: the mechanism that anchors long-term BTC capital on-chain and establishes the economic foundation for the phases that follow, including a 100x throughput increase and a full suite of Bitcoin-native lending, borrowing, and programmable capital products.

The mechanism builds directly on PoX, which has operated in production since January 2021 and distributed more than 4,200 BTC in stacking rewards to date. Bitcoin Staking extends this existing infrastructure.

How It Works

Under Bitcoin Staking, participants form “protocol bonds” where participants pair a BTC timelock on Bitcoin with a corresponding STX lock on Stacks for a 6-month bonding period, targeting a fixed yield subject to the risks inherent to the protocol. The BTC remains on the Bitcoin blockchain, secured by Bitcoin consensus, under participant-controlled keys for the full bonding period.

BTC yield is generated the same way it is today under PoX: Stacks miners bid BTC to compete for STX block rewards and transaction fees. That miner-paid BTC is distributed to eligible participants. Bitcoin Staking changes who is eligible and how rewards are prioritized, not how they are generated.

Bitcoin Staking distributes PoX rewards according to a waterfall structure. Paired BTC-plus-STX positions form the primary tranche and receive the target yield rate for their respective bonds. After protocol bond obligations are met, excess miner revenue is split between STX-only stakers and a reserve fund that buffers payouts when miner revenue falls short. 

Phased Rollout

The whitepaper proposes Bitcoin Staking launches in two phases. The first, PoX-5, is a managed bootstrap period expected to run approximately 12 months. During this phase, Stacks Endowment sets capacity and yield parameters and intends to work with a set of institutional partners who have been onboarded ahead of launch. Initial program conditions target 3,000 BTC in capacity at a 3% BTC APY with a 5% minimum STX pairing ratio. Partner onboarding for the bootstrap phase is underway; interested institutions can contact Stacks Endowment directly.

During the bootstrap phase, Bitcoin Staking will progressively decentralize, eventually transitioning to PoX-6, a permissionless consensus-encoded operation. In this phase, a permissionless sealed-bid clearing auction determines capacity allocation while yield rates, and ratio requirements are determined on-chain from miner economics, reserve fund status, and prior-period participation data. This phase is the fully decentralized end state described in the whitepaper.

Both phases require community governance approval through the Stacks Improvement Proposal (SIP) process. 

Participation Paths

BTC holders can pair native Bitcoin, timelocked on L1, with STX for full protocol bond participation. sBTC holders, the Bitcoin-backed asset on Stacks, can pair sBTC with STX through L2 smart contracts, enabling pooled participation and DeFi integrations. STX holders can stake without any Bitcoin commitment and receive residual yield as the third tranche of the waterfall. Pooled participation options exist across all paths for smaller holders. 

"Bitcoin is the world's most trusted asset precisely because of its design and safety principles on the L1. Bitcoin Staking changes the calculus; holders can now earn yield denominated in BTC, trustlessly, while their Bitcoin stays exactly where it belongs. This whitepaper is the culmination of years of protocol-level work to make Bitcoin programmable without compromising what makes it Bitcoin." — Muneeb Ali, Founder, Stacks.

“Bitcoin holders have been waiting for a way to put their capital to work without giving it up. What we’ve built on Stacks has already distributed over 4,200 BTC in real yield since 2021. Bitcoin Staking takes that proven infrastructure and makes BTC itself the yield-bearing asset, under the holder’s own keys, on Bitcoin. The whitepaper is the technical specification for Phase 1 of what we laid out in the roadmap last week — and the institutional partners we’ve been working with are ready to move.” — Alex Miller, CEO, Stacks Labs.

Availability

The full Bitcoin Staking whitepaper is available today here . The Stacks 2026 roadmap, which provides the broader context for Bitcoin Staking as Phase 1 of the network’s development plan, is available at stacks.co/roadmap. Community discussion and the SIP governance process will follow publication. Technical specifications, implementation documentation, and partner onboarding details will be published in subsequent releases. Institutions interested in participating in the PoX-5 bootstrap program should contact Stacks Endowment at vip@stacksendowment.co .

About Stacks

Stacks is the leading Bitcoin layer by BTC deployed, providing infrastructure for a growing range of Bitcoin-native applications. The network enables Bitcoin-native financial applications, from lending and borrowing to autonomous AI agents, all settled with Bitcoin finality. Users can learn more at stacks.co .

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