Bitcoin Staking Genesis Bond: How It Works

The Genesis Bond is the first bonding period of self-custodial Bitcoin Staking on Stacks. It targets Bitcoin block 966,350 (reward cycle 143), around September 10, and it runs on a mechanism that has already distributed more than 4,500 BTC to participants since January 2021. The Genesis Bond opens up a new way for participants to earn Bitcoin committed by miners to mine Stacks blocks.

During this bootstrap phase, self-custodial participation is whitelisted, with approval running through the Stacks Endowment in order to maintain flexibility while the system gathers economic data. Non-whitelisted BTC holders participate through the pooled staking path. This path runs on Stacks with sBTC and is covered separately in Pooled Bitcoin Staking on Stacks: How It Works.

Once the protocol moves to PoX-6, a permissionless auction opens direct participation in self-custodial Bitcoin staking to anyone.

Anchor Participants

During the bootstrap phase, self-custodial Bitcoin staking is whitelisted for anchor participants: institutions and individual holders committing durable BTC capital and STX staking capacity to the long-term growth of the Bitcoin economy on Stacks.

The Endowment evaluates prospective anchor participants on durable BTC capital and STX staking capacity, committed period over period, not on institutional status alone.

To join the next Self-custodial Bitcoin Staking bond, reach out to the Stacks team.

How the Bond Works

A Genesis Bond position is a dual-asset commitment. BTC is timelocked on the Bitcoin L1, under the participant's own keys, using a standard Bitcoin timelock script. Alongside it, STX is locked on Stacks at 5% of the bonded BTC's value. That STX is the staking capacity that anchors the position and secures the participant's claim on rewards.

Each bonding period runs 6 months. Participants receive a BTC payout every week for the length of the term. The BTC timelock expires about 10 days before the period ends, giving participants a window to re-lock into the next period before their current one closes. STX unlocks at the end of the term.

The yield for the Genesis Bond targets 3% BTC APY, set before the period opens and held for the full 6 months. During the PoX-5 bootstrap phase, the Endowment doesn't adjust the rate mid-period. Instead, it manages demand by sizing each bonding period's capacity conservatively. Capacity is the variable that changes between periods; the rate is the constant participants can plan around.

Where the Yield Comes From

Stacks miners spend BTC to mine Stacks blocks and earn STX in return, a mechanism called Proof of Transfer. That BTC paid by miners is what flows to participants: Bitcoin Staking gives bonded BTC first claim on it through the reward waterfall. Today, that flow is funded by a mix of block rewards and transaction fees. As activity on Stacks grows, the design intent is for fees from economic activity to become self-sustaining source over time.

Custody, Exit, and Risk

BTC never leaves the participant's own custody. It sits in a standard Bitcoin timelock on the L1, not a bridge or a wrapped representation of BTC, and there's no slashing condition that can seize it. When the timelock expires, both the BTC and the paired STX return in full, regardless of miner behavior or network conditions during the period.

Participants can exit a position before term end by withdrawing their BTC early, though doing so forfeits any yield that hasn't been distributed yet. The paired STX stays locked for the full 6-month term either way.

Because BTC principal is locked under standard Bitcoin script rather than exposed to a bridge, wrapper, or slashing mechanism, the risk in a Genesis Bond position sits on the yield side, not the principal side.

Custody support is live today through Fireblocks and Fordefi, with Leather supporting multisig setups through Ledger.

The Whitelist, and What the Endowment Optimizes For

Self-custodial participation is whitelisted during the bootstrap phase because the Stacks Endowment sets capacity and yield for each bonding period while actively monitoring the mechanism's economics over roughly 12 months.

Capacity is allocated to the participants that grow the Bitcoin economy on Stacks, measured by the lasting capital and new users they bring into the ecosystem. For anchor participants, that means durable BTC capital paired with STX staking capacity, committed period over period.

New bonding periods open roughly monthly, with capacity set ahead of each opening. Allocation requests run through here.

What Comes Next

PoX-6 removes the whitelist entirely. Capacity opens up through a permissionless auction. This version is expected to launch in 6-12 months.

Bitcoin Staking is the first step in Bitcoin-native finance on Stacks. Self-custodial borrowing against staked BTC is on the roadmap, alongside other ways to put Bitcoin to work without ever giving up custody of it.

FAQ

Where does the yield come from, and who is paying me?
Stacks miners spend BTC to mine blocks and earn STX through Proof of Transfer. That BTC flows to Bitcoin Staking participants, who hold first claim on it through the reward waterfall.

Do I give up custody of my BTC?
No. BTC is timelocked directly on the Bitcoin L1 under your own keys, using a standard script in production since 2015. It is never bridged or wrapped.

Why do I need STX, and how much per BTC?
STX is the staking capacity that anchors your position and secures your claim on rewards. Each Genesis Bond position pairs STX at 5% of the bonded BTC's value.

Is there slashing? Can I lose my principal?
There's no slashing mechanism. Genesis Bond risk sits on the yield side, not the principal side. See the Bitcoin Staking Risk Profile for the full breakdown.

Can I exit early?
Yes. You can withdraw BTC before the term ends, but doing so forfeits any yield not yet distributed. Paired STX stays locked for the full 6-month term.

Are payouts in actual BTC, and how often?
Payouts are in BTC, distributed weekly across 24 distributions over the 6-month bonding period.

What happens at the end of the bonding period?
The BTC timelock expires about 10 days before period end, giving you a window to re-lock into the next bonding period. STX unlocks at the end of the term.

What happens to my BTC if the Stacks network halts?
Your BTC sits in a standard Bitcoin timelock on the L1 itself. It's not custodied by the Stacks network, so it's not exposed to a Stacks-side halt.

How do I verify my rewards?
Genesis Bond activity is verifiable on-chain.