# Practical Application: Multi-Signature Flexibility

Stack depth checking enables scripts that adapt to different signing scenarios:

```
OP_DEPTH OP_2 OP_LESSTHAN OP_IF
  // Single signature path
  <pubkey1> OP_CHECKSIG
OP_ELSE
  // Multi-signature path
  OP_2 <pubkey1> <pubkey2> OP_2 OP_CHECKMULTISIG
OP_ENDIF
```

This script accepts either:

* **One signature** (checked against first public key)
* **Two signatures** (requires both signatures in 2-of-2 multisig)

**Use cases:**

* **Emergency recovery:** Normal operations require one signature, high-value transfers require two
* **Tiered authorization:** Small amounts need one signature, large amounts need multiple
* **Progressive security:** Initial setup uses single key, later upgraded to multisig

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