# Bond Token

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**Source:** `src/fira_bonding/core/YieldContracts/BondToken.sol`
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## Contract summary

BondToken is intentionally minimal. It stores immutable references to FW, factory, and expiry. The CT address is set once during `initialize()`, and the LiquidityInjector address is stored as a configurable variable.

## Access control

* **`mintByCT` / `burnByCT`** — Only the paired CouponToken can call these
* **`mintByLI` / `burnByLI`** — Only the LiquidityInjector can call these
* No other address can mint or burn BT

This strict access prevents principal inflation outside the yield-split lifecycle.

## Expiry

`isExpired()` delegates to `MiniHelpers.isCurrentlyExpired`. BT has no post-expiry logic itself — all post-expiry behavior lives in the CouponToken contract.

## Inherited contracts

* `FiraERC20` — ERC-20 with reentrancy guard


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