Babylon Labs advanced a governance proposal on October 15 to integrate native Bitcoin as collateral on Aave V4, eliminating the need for wrapped tokens or third-party custodians. The proposal, now at the Aave Request for Comment (ARFC) stage, would allow Bitcoin holders to lock BTC in Taproot-bas...
Babylon Labs advanced a governance proposal on October 15 to integrate native Bitcoin as collateral on Aave V4, eliminating the need for wrapped tokens or third-party custodians. The proposal, now at the Aave Request for Comment (ARFC) stage, would allow Bitcoin holders to lock BTC in Taproot-based vaults on the Bitcoin network and borrow stablecoins through Aave's hub-and-spoke lending architecture. Approximately 40,772 BTC — valued at $3.37 billion — currently sit in Babylon's staking infrastructure, representing the initial collateral base the integration would tap.
The proposal arrives as wrapped Bitcoin products — WBTC ($9.67 billion market cap, 116,130 supply) and Coinbase's cbBTC ($7.74 billion market cap, 95,020 supply) — collectively represent over $17 billion in tokenized BTC but carry counterparty risk tied to centralized custodians. Babylon's approach bypasses this dependency entirely. Bitcoin never leaves its native chain. A non-transferable ERC-20 accounting token on Ethereum represents the locked collateral within Aave's contracts. Six security firms have audited the vault system, with Runtime Verification completing formal verification of the smart contracts.
The revenue-sharing structure allocates the first $500,000 in qualifying annual revenue entirely to the Aave DAO, with tiered splits above that threshold distributing proceeds between Aave, Babylon, and token purchase programs for AAVE and BABY. The integration still requires a three-day Snapshot vote (minimum 320,000 AAVE-equivalent votes) followed by an on-chain Aave Improvement Proposal before activation.
Babylon Labs first submitted the proposal on May 25, 2026. A preliminary community temperature check passed in June. On October 15, the proposal advanced to the ARFC stage — the formal comment period where the Aave community scrutinizes technical design, risk parameters, and economic terms.
The remaining governance path:
No mainnet activation date has been set. The initial partnership announcement in early 2026 targeted an April launch, but governance review has extended the timeline. Testing began in Q1 2026.
The core mechanism relies on Babylon's Trustless Bitcoin Vaults (TBVs). The process:
The design eliminates three dependencies present in current wrapped BTC solutions: centralized custody, cross-chain bridges, and custodian-issued redemption guarantees.
Aave V4 launched on Ethereum mainnet after over two years of development. Its hub-and-spoke architecture centralizes liquidity in a shared hub while connecting autonomous lending markets (spokes) with tailored risk profiles, collateral types, and liquidation rules.
When a user supplies assets through any spoke, capital enters the shared hub and becomes available to every connected spoke. Borrowers draw from this unified pool. The architecture segments markets into three risk hubs — Prime, Core, and Edge — each with different tolerance parameters.
The Babylon integration would add two new spokes:
This is the first external spoke implementation proposed for Aave V4. According to Kulechov, the proposal demonstrates V4's extensibility — new collateral types and credit structures can be added without modifying the core protocol. Aave V4 is currently live on Ethereum, Avalanche, Arc, and Base, holding $59.74 million in TVL in V4 specifically, while Aave across all versions (V2, V3, V4) holds approximately $19.2 billion in TVL as of September 2026, according to S&P Global.
The proposal specifies a tiered revenue-sharing structure between the Aave DAO, Babylon, and token purchase programs:
| Annual Revenue Band | Aave DAO | Babylon | Token Purchases | |---|---|---|---| | First $500,000 | 100% | 0% | 0% | | $500K – $2M | 78% | 18% | 4% | | $2M – $6M | Proportionally adjusted | Proportionally adjusted | Proportionally adjusted | | Above $6M | 61.5% | 31.5% | 7% |
Token purchases are split 85% AAVE and 15% BABY. The structure front-loads revenue to the Aave DAO at lower volumes and shifts toward a more balanced split as the integration scales. At $6 million in annual revenue, the Aave DAO would retain approximately $4.2 million, Babylon approximately $1.5 million, and token purchases approximately $300,000.
Babylon Labs has cited over $1 billion in BTC-backed loans originated in 2025 as evidence of demand. The firm's blog post projects the broader BTC borrowing market could reach "tens of billions of dollars."
Six security firms conducted audits of the vault system: Coinspect, Sherlock, Zellic, ABDK, ZK Security, and Runtime Verification. Runtime Verification performed formal verification — mathematical proof that smart contract code behaves according to its specification — on the vault contracts.
Emergency governance controls include:
Babylon engineer Aleksa Opacic clarified that emergency controls "cannot move collateral but can block access temporarily." This distinction is material: during a security incident, users' Bitcoin remains locked on the Bitcoin network, but they may be unable to access their borrowed positions or repay loans until the pause is lifted.
The proposal addresses a structural tension in Bitcoin-to-DeFi workflows. Current solutions:
Combined, these two products represent over $17.4 billion in tokenized Bitcoin on Ethereum and other chains. Both require users to surrender custody of their BTC to a centralized entity and receive an IOU token in return. Both carry redemption risk — the possibility that the custodian cannot or will not return the underlying Bitcoin.
Babylon's model changes the trust assumption. Bitcoin stays in a cryptographic vault on the Bitcoin blockchain. No custodian holds the keys. The trade-off: the liquidation mechanism still depends on wrapped BTC for settlement, meaning wrapped tokens remain in the system at the liquidation layer, even if they exit the collateral layer.
Bitcoin DeFi (BTCFi) TVL stands at approximately $4.38 billion as of October 18, 2026, according to DefiLlama. Babylon dominates this market with approximately $4.29 billion — roughly 80% of the total.
The BTCFi sector has contracted sharply from its peaks. A Spark Money research report documented a 74% decline in Bitcoin DeFi TVL from its highs, driven by yield compression, protocol exploits, and the withdrawal of speculative capital. Babylon's TVL itself has fluctuated: peaking above $5.6 billion in late 2024, dropping 32% in April 2025 after a $1.2 billion unstaking event, recovering to over $4 billion by May 2026, and settling at $3.37 billion in active staking as of the proposal date.
Only 0.79% of Bitcoin's total supply is currently locked in DeFi protocols. Bitcoin's market cap stands at approximately $1.7 trillion. If the Babylon-Aave integration attracts even 1% of Bitcoin supply into lending, that would represent roughly $17 billion in collateral — nearly equal to the entire wrapped BTC market today.
For context, the broader DeFi market holds over $130 billion in TVL across all chains, while DeFi lending TVL specifically has climbed 55% since its July 2026 low to approximately $56 billion by mid-October.
Liquidation complexity: The reliance on wrapped BTC for liquidation settlement reintroduces the very counterparty risk the proposal seeks to eliminate — at the most critical moment (when collateral must be seized and sold). During periods of extreme market stress, the swap from native BTC vaults to wrapped BTC settlement adds latency and potential failure points.
Governance concentration: The four-of-seven multisig and three-of-five guardian arrangement concentrate emergency authority in a small group. While the five-day timelock provides a buffer for upgrades, emergency pauses can freeze user positions immediately. Collateral security does not guarantee uninterrupted access.
Adoption uncertainty: Babylon's cumulative 100,000+ BTC activations include a volatile staking history. The $1.2 billion unstaking event in April 2025 demonstrated that large holders can exit quickly. Lending demand for BTC-backed stablecoins at scale remains unproven through this specific mechanism.
Regulatory ambiguity: The proposal creates a novel financial instrument — a non-transferable accounting token representing locked native BTC used as collateral for stablecoin borrowing on a separate chain. How regulators classify this instrument, particularly under evolving stablecoin and DeFi frameworks in the U.S. and EU, is unclear.
Smart contract risk: Despite six audits and formal verification, the system introduces new contract interactions between Bitcoin Script (Taproot), Ethereum smart contracts, and the Aave V4 spoke architecture. Cross-chain interactions remain among the highest-risk attack surfaces in DeFi.
The Babylon-Aave proposal represents a structural attempt to solve Bitcoin DeFi's custodial dependency problem. If approved and deployed, it would be the first lending protocol to accept native, non-wrapped Bitcoin as collateral at scale. The economic logic is straightforward: $1.7 trillion in Bitcoin market cap generates no yield. Even marginal lending demand against that base would produce significant protocol revenue.
The engineering is non-trivial. Coordinating Bitcoin Taproot vaults, Ethereum ERC-20 accounting tokens, and Aave V4's spoke architecture across two separate blockchains introduces cross-chain complexity that no amount of auditing fully eliminates. The liquidation mechanism's reliance on wrapped BTC is a pragmatic compromise that partially undermines the proposal's trust-minimization thesis.
The governance path remains long. Temperature check passed. ARFC is live. Snapshot and on-chain votes remain. The market will determine whether the demand exists. What the proposal does establish is that Aave V4's hub-and-spoke architecture can accommodate fundamentally different collateral types — a design validation that extends beyond this specific integration.