Stacks’ PoX-6 Could Shift Bitcoin Staking Terms to Algorithmic Settings

Stacks’ ratified Bitcoin-staking plan leaves launch terms to the Stacks Endowment and describes PoX-6 as a possible later shift to protocol-calculated settings, without approving a final design for the upgrade.

PoX-5 activated July 30, 2026, at Bitcoin block 960,230. The system pairs a Bitcoin (BTC) timelock with an STX lock for BTC-denominated yield, while participants retain control of their BTC through their own keys.

During PoX-5’s bootstrap phase, the Stacks Endowment sets program parameters. The plan lists initial conditions of 3,000 BTC in capacity, a 5% minimum STX ratio and 3% target annual percentage yield in BTC. Final values are set before activation and may vary with partner capacity.

The plan describes PoX-6 as a phase that could move calculation of the yield rate, capacity and BTC-to-STX ratio to the protocol. A permissionless auction model has also been discussed as a future possibility, but the ratified plan does not establish that mechanism.

The distinction affects how participants’ terms would be determined. Under the current plan, the Endowment sets launch parameters; a protocol-calculated approach could change how those parameters are set. The plan calls for a PoX-6 reassessment based on performance during the bootstrap phase, and PoX-5’s approval does not commit Stacks to a specific PoX-6 design.

Stacks’ Bitcoin-staking plans also include planned institutional support from Anchorage Digital.