# Limitations and Considerations

### What False Return Outputs Cannot Do

#### 1. Cannot store mutable data

* Data is immutable once confirmed
* Cannot edit, update, or delete
* Solution: Create versioned records with new transactions

**2. Cannot execute conditional logic**

* In False Return outputs, OP\_RETURN immediately terminates execution, limiting conditional logic for scripting purposes. However, OP\_RETURN can be used in conjunction with other opcodes such as OP\_CODESEPARATOR to build in conditional logic to scripts.
* Cannot combine with signature checks in same output
* Solution: Use separate outputs for conditions

**3. Cannot be spent or transfer value**

* Provably unspendable by design
* Cannot attach claimable value
* Solution: Use side-by-side payment outputs

### Privacy Considerations

Data in OP\_RETURN is **permanently public and globally visible**. Anyone can read every False Return output ever created.

#### Privacy guidelines:

✅ Store **hashes** of sensitive documents

✅ **Encrypt data** before embedding

**✅ Public commitments** meant to be transparent

❌ **Personal identifying** information in plaintext

❌ **Proprietary data** without encryption

❌ Data subject to **deletion regulations**

**Example: Privacy-preserving timestamp**

```
OP_0 OP_RETURN <protocol_id> SHA-256(document + salt) <encrypted_metadata>
```


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