#baby $BABY Many people think Babylon’s TBV (Bitcoin Vault) is just a BTC-collateralized deposit-and-savings container…… But that’s not the case. What truly moved me was that, after its deep integration with Aave v4, it creates a native #BTC cross-chain, four-step self-custody lending loop through a Hub & Spoke architecture.
DeFi veterans shouldn’t be unfamiliar with this: in the past, borrowing using Bitcoin as collateral relied heavily on “proxy tokens and third-party intermediaries.” To borrow stablecoins on an EVM chain, you either convert BTC into wBTC—carrying the risks of centralized custody and bridge de-anchoring—or hand your private key to a multi-signature committee. Once a black-swan event or intermediary failure occurs, assets are left “naked” on-chain, and users can only watch their losses happen without any ability to act.
With the current approach, integrated with Aave v4, that single-trust model centered on proxy tokens is completely broken. It builds a multi-layer self-custody lending system using a native TBV funding vault, cross-chain activation via state proofs, and a state unlock callback mechanism:
Native TBV funding vault: Users create an independent TBV on the Bitcoin mainnet, lock BTC using Taproot and time locks. The private key remains fully self-custodied throughout, and the assets never leave the Bitcoin mainnet.
State-proof cross-chain activation: TBV’s locked state generates cryptographic proof, which directly activates the collateral position in Aave v4’s dedicated Spoke module on Ethereum and enables seamless borrowing of USDC/USDT.
State-unlock callback mechanism: After users repay their debt on Ethereum, Aave v4 triggers an unlock proof to be sent back to the Bitcoin mainnet, automatically activating the TBV script to release BTC. The entire process requires no third-party trust endorsement.
Of course, this cross-chain closed-loop architecture is still in its early deployment stage and has not yet been tested over long periods under extreme market conditions or with large amounts of capital. In real operation, the synchronization latency of cross-chain state proofs and the sharp rise in BTC mainnet Mempool fees remain key shortcomings. If repayment unlock or liquidation proof callbacks run into extreme congestion on the Bitcoin mainnet, the transactions may not be included in blocks on time, easily causing unlock delays and even sparking disputes over liquidation.
What do you think of this “assets never leave the mainnet” native BTC lending model? Should we keep using wBTC for token mapping, or start trusting this cryptographic-proof closed loop? Let’s discuss in the comments.
DeFi veterans shouldn’t be unfamiliar with this: in the past, borrowing using Bitcoin as collateral relied heavily on “proxy tokens and third-party intermediaries.” To borrow stablecoins on an EVM chain, you either convert BTC into wBTC—carrying the risks of centralized custody and bridge de-anchoring—or hand your private key to a multi-signature committee. Once a black-swan event or intermediary failure occurs, assets are left “naked” on-chain, and users can only watch their losses happen without any ability to act.
With the current approach, integrated with Aave v4, that single-trust model centered on proxy tokens is completely broken. It builds a multi-layer self-custody lending system using a native TBV funding vault, cross-chain activation via state proofs, and a state unlock callback mechanism:
Native TBV funding vault: Users create an independent TBV on the Bitcoin mainnet, lock BTC using Taproot and time locks. The private key remains fully self-custodied throughout, and the assets never leave the Bitcoin mainnet.
State-proof cross-chain activation: TBV’s locked state generates cryptographic proof, which directly activates the collateral position in Aave v4’s dedicated Spoke module on Ethereum and enables seamless borrowing of USDC/USDT.
State-unlock callback mechanism: After users repay their debt on Ethereum, Aave v4 triggers an unlock proof to be sent back to the Bitcoin mainnet, automatically activating the TBV script to release BTC. The entire process requires no third-party trust endorsement.
Of course, this cross-chain closed-loop architecture is still in its early deployment stage and has not yet been tested over long periods under extreme market conditions or with large amounts of capital. In real operation, the synchronization latency of cross-chain state proofs and the sharp rise in BTC mainnet Mempool fees remain key shortcomings. If repayment unlock or liquidation proof callbacks run into extreme congestion on the Bitcoin mainnet, the transactions may not be included in blocks on time, easily causing unlock delays and even sparking disputes over liquidation.
What do you think of this “assets never leave the mainnet” native BTC lending model? Should we keep using wBTC for token mapping, or start trusting this cryptographic-proof closed loop? Let’s discuss in the comments.
