Splitting BTC into two vaults sounds like creating two separate deposits.

That is not quite what happens.

With Trustless Bitcoin Vaults (TBV), the recommended two-vault setup can begin from one Pre-PegIn Bitcoin transaction containing two HTLC outputs.

One transaction.
Two future vaults.

The obvious benefit is lower Bitcoin fees.

The less obvious part is that both vaults now share the same beginning.

They wait on the same transaction to confirm. The setup is coordinated around both outputs, and the pair is designed to activate together rather than leaving one vault ready while the other is still somewhere behind it.

I initially liked the split only because of liquidation.

Put a sacrificial vault first.
Keep the protected vault behind it.
Reduce the cliff effect.

But the structure starts earlier than liquidation.

Before either vault can protect the other, both are born from the same Bitcoin transaction.

That is efficient, but it also means the pair is not really two independent setup journeys. A delayed Pre-PegIn delays both. A stalled creation flow leaves both waiting.

Later, they can carry different liquidation roles.

At birth, they share the same clock.

That made the “two-vault split” feel less like dividing one balance into two boxes and more like creating twins with different jobs.

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