# memez\_fun
destroy - destroys the Migrator hot potato to get the inner balances.
```rust
public fun destroy(
migrator: MemezMigrator,
_: Witness,
): (address, Balance, Balance)
```
**Arguments:**
* **`migrator: MemezMigrator`**\
The migration hot potato representing a Memez pool in its migratable state.\
Consuming this object finalizes the migration process and allows recovery of the underlying assets.
* **`_: Witness`**\
A witness type ensuring only the authorized package can invoke `destroy` function.\
Serves as a compile-time capability check (must have the `drop` ability).
update\_metadata - replaces the pool metadata.
```rust
public fun update_metadata(
self: &mut MemezFun,
metadata_cap: &MetadataCap,
mut metadata: VecMap,
)
```
**Arguments:**
* **`self: &mut MemezFun`**\
A mutable reference to the Memez pool instance (for any curve type).\
This is the pool whose metadata will be updated.
* **`metadata_cap: &MetadataCap`**\
A capability object that authorizes metadata updates.\
Ensures only accounts with the correct permission can modify the pool’s metadata.
* **`metadata: VecMap`**\
A key–value map of metadata fields (as strings) to attach or update on the pool.\
Typical entries may include name, symbol, description, or custom fields relevant to frontends or indexers.
metadata - returns the current pool metadata
```rust
public fun metadata(
self: &MemezFun,
): VecMap
```
**Arguments:**
* **`self: &MemezFun`**\
An immutable reference to the Memez pool instance (for any curve type).\
The pool whose metadata will be read.
next\_nonce - returns the next nonce for the server to create a signature valid for the `user`.
```rust
public fun next_nonce(self: &MemezFun, user: address): u64
```
**Arguments:**
* **`self: &MemezFun`**\
An immutable reference to the Memez pool instance (for any curve type).\
The pool from which the nonce will be queried.
* **`user: address`**\
The address of the user whose next nonce is being requested.\
It is used to prevent replay attacks and ensure transaction uniqueness for that user in the pool.