Aave Proposes Anchorage-Custodied Bitcoin (BTC) as V4 Loan Collateral

Aave V4 Custodied Collateral Proposal

Aave Labs has formally proposed a lending framework that would let institutional investors borrow stablecoins against Bitcoin (BTC) held with a regulated custodian — without the coins ever leaving custody or moving on-chain. The proposal, titled “Custodied Collateral Lending: Aave V4 Isolated Hub & Spoke,” was posted as an ARFC (Aave Request for Comment) on the protocol’s governance forum on September 14, and it takes aim at a long-standing bottleneck: putting Bitcoin DeFi (BTCfi) to work for institutions whose compliance rules and internal approvals make moving custodied assets costly or impractical. Under the design, the underlying BTC stays put at Anchorage Digital Bank for the life of the loan. In place of a conventional wrap, the custodied balance is represented on-chain by a Custodied Collateral Token (CoCT) — an internal accounting unit rather than a tradeable asset. The CoCT cannot be transferred to outside parties, and it confers no direct ownership claim on the Bitcoin; control and legal recourse remain anchored in Anchorage’s custody framework and its Account Control Agreement. The institution deposits the CoCT into a dedicated Aave V4 market as collateral and draws stablecoins against it. Typical on-chain lending against Bitcoin requires converting holdings into a wrapped representation such as wrapped Bitcoin (WBTC) and moving them onto the lending chain, exposing the asset in transit; the proposed structure strips out that step entirely. Keeping the two ledgers aligned falls to Chainlink’s CustodySync, a synchronization layer that mints additional CoCT when the custody balance rises and burns tokens when it falls, while relaying loan, repayment and liquidation states between Anchorage’s collateral management system and Aave’s on-chain state. Neither Chainlink nor Aave ever holds the Bitcoin itself — custody stays with Anchorage throughout, and Aave frames the structure as a way to extend on-chain credit access by combining regulated custody with Chainlink infrastructure.

OTC Liquidations Draw Scrutiny

Borrowing would run through an isolated Hub and Spoke configuration inside Aave V4, an architecture that fences the new market’s collateral and borrow assets off from every other hub and spoke so risk cannot bleed into existing pools; the proposal explicitly leaves current Aave markets and reserves untouched. Because CoCT balances track what the custodian actually holds rather than a freely circulating token, credit supply inside the market is bounded by the custody balance itself. The most consequential divergence from standard DeFi lending is liquidation. Rather than triggering an automated smart-contract sale, a liquidation event hands the Bitcoin to Anchorage, which sells it over-the-counter (OTC) and applies the proceeds to settle the borrower’s outstanding Aave debt. Loan safety therefore depends not only on code but on the custodian’s execution speed, depth in the OTC market and the enforceability of legal contracts — a far heavier off-chain component than pure on-chain liquidations carry. That trade-off has already drawn scrutiny in the governance discussion: contributors note that during sharp price drops or thin market conditions, an OTC liquidation could settle later than an on-chain auction and enlarge bad debt, while heavy reliance on CustodySync and price oracles creates dependency risks. Commenters have accordingly called for conservative collateral ratios, supply and borrow caps and circuit-breaker mechanisms as a condition of any launch. None of the core risk parameters — loan-to-value ratio, liquidation bonus, supply and borrow limits, interest-rate model or oracle configuration — has been decided; a risk-management service provider is expected to issue recommendations before final figures are fixed. Readers tracking the market in real time can follow live spot and futures prices on Bybit.

Snapshot Vote Still Ahead

In our reading, this proposal is plumbing before product: the genuine innovation is the custody-to-chain synchronization, not the lending itself. If CustodySync performs reliably, regulated custodians effectively become collateral rails, widening institutional access to Bitcoin markets without forcing a choice between security and yield. The gating items, however, are concrete and undisclosed in the filing: no recommended collateral ratio, no launch timeline and no cap figures have been published. The remaining path is procedural — the ARFC discussion runs its course, a Snapshot vote follows, then a formal AIP goes to on-chain governance approval. Until those steps clear, the design remains a discussion paper: significant for its architecture, but not yet a functioning market.