> For the complete documentation index, see [llms.txt](https://docs.threshold.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.threshold.network/app-development/tbtc-contracts-api/tbtc-v2-api/ivault.md).

# IVault

## IVault

`IVault` is an interface for a smart contract consuming Bank balances of other contracts or externally owned accounts (EOA).

### receiveBalanceIncrease

```solidity
function receiveBalanceIncrease(address[] depositors, uint256[] depositedAmounts) external
```

Called by the Bank in `increaseBalanceAndCall` function after increasing the balance in the Bank for the vault. It happens in the same transaction in which deposits were swept by the Bridge. This allows the depositor to route their deposit revealed to the Bridge to the particular smart contract (vault) in the same transaction in which the deposit is revealed. This way, the depositor does not have to execute additional transaction after the deposit gets swept by the Bridge to approve and transfer their balance to the vault.

The implementation must ensure this function can only be called by the Bank. The Bank guarantees that the vault's balance was increased by the sum of all deposited amounts before this function is called, in the same transaction.

#### Parameters

| Name             | Type       | Description                                             |
| ---------------- | ---------- | ------------------------------------------------------- |
| depositors       | address\[] | Addresses of depositors whose deposits have been swept. |
| depositedAmounts | uint256\[] | Amounts deposited by individual depositors and swept.   |


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