Babylon wants Aave V4 borrowers to post Bitcoin that never leaves the Bitcoin network

Two dates in the account can be subtracted, and the answer is slower than the pitch implies. Babylon and Aave announced their partnership on December 3, 2025 ^[12], and the DAO temperature check began on May 25, 2026 ^[13], a gap of 173 days ^[15]. From the start of that check to the October 7 confirmation of HashKey Cloud's institutional integration is another 135 days ^[16], and the ARFC and AIP stages, the detailed comment phase and the final on-chain vote, are still ahead ^[2][14]. We'd expect those two to take at least as long as the first, because Cryptobriefing describes them as the phase where proposals tend to get picked apart line by line ^[5].

The design is cleaner on the way in than on the way out. Aave sees the deposit only as vaultBTC, an internal accounting unit that records the BTC sitting in vaults ^[4], and Taproot scripts plus zero-knowledge proofs decide when the coins can move ^[17]. Cryptobriefing itself says that using Bitcoin in lending has usually meant wrapping it and trusting someone to hold the real coins ^[10], and that custody-wary funds have often been the loudest critics of wrapped Bitcoin ^[19]. A liquidation is where the WBTC payout enters.

The counter-case is fair. A borrower meets WBTC only if liquidated or if the borrower chooses to borrow it ^[6][8], so the wrapped asset sits at the edges of the design. We think that holds for most positions and still leaves the swap spoke as the piece to examine, since in the source's words every lending market "lives or dies by its liquidations" ^[20]. The article points to Babylon's liquidation documentation in its developer docs ^[11] but does not say where the swap spoke gets the WBTC it pays out. We would be wrong on that point if the documentation answers it cleanly, and wrong on timing if the remaining votes clear in well under 135 days.

On allocation, Babylon builds the vaults and the swap spoke, and the DAO decides how much can be borrowed and when positions get closed out ^[9]. Until it does, risk parameters are unset ^[2] and real money has not touched the design ^[7], though a public testnet was active by October 2026 ^[18].