# New Cryptographic Capabilities

Chronicle didn't just restore historical opcodes—it **introduced new functionality** for modern cryptographic operations.

#### New Hash Functions: SHA-512 Family

| Opcode              | Input | Output | Function                          |
| ------------------- | ----- | ------ | --------------------------------- |
| **OP\_SHA512**      | x     | hash   | Produces 64-byte SHA-512 hash     |
| **OP\_SHA512\_256** | x     | hash   | Produces 32-byte SHA-512/256 hash |

**Why Add New Hash Functions?**

* **Protocol compatibility:** Many modern systems use SHA-512 (FIDO2, modern TLS, data integrity standards)
* **Interoperability:** Scripts can verify hashes from external systems
* **Future-proofing:** Multiple hash options provide flexibility

**Example: Verifying external data**

```
<document_data> OP_SHA512 
<expected_sha512_hash> OP_EQUAL
```

#### Data Transformation: OP\_SPLIT

**OP\_SPLIT** divides a byte sequence at a specified position:

```
<32_byte_txid>_<4_byte_index> OP_32 OP_SPLIT
# Separates into: txid | index
```

Combined with **OP\_CAT** (for joining), **OP\_SPLIT** provides comprehensive data manipulation capabilities.


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