# Set Script

Smart accounts have a custom script that defines how transactions should be validated. The script needs to be compiled by the node before it's broadcasted as a transaction.

Scripts are written in the [Ride programming language](https://docs.waves.tech/en/ride/).

```javascript
{
	"type": 13,
	"version": 3,
	"id": "BGUEn2TERW4nnAQuXYgJ3z6qp28ivk3kykb724wV7MZz",
	"sender": "3MtHYnCkd3oFZr21yb2vEdngcSGXvuNNCq2",
	"senderKeyType": "ed25519",
	"senderPublicKey": "4EcSxUkMxqxBEBUBL2oKz3ARVsbyRJTivWpNrYQGdguz",
	"script": "base64:AQkAAfQAAAADCAUAAAACdHgAAAAJYm9keUJ5dGVzCQABkQAAAAIIBQAAAAJ0eAAAAAZwcm9vZnMAAAAAAAAAAAAIBQAAAAJ0eAAAAA9zZW5kZXJQdWJsaWNLZXmmsz2x",
	"timestamp": 1519862400,
	"fee": 500000000,
	"proofs": [
	  "jxW9T2iUSQ68yv41Wj8JKb8HykwzKzbuHLBG6eySLaXk45rNbDo3zr2AS9bGMggrBZUUJQTFjKHeiD1q69pPUxY"
	],
	"height": 1248629
}
```

### Examples

#### Restrict account

```javascript
match tx {
  case t:  TransferTransaction => false
  case mt: MassTransferTransaction => false
  case ss: SetScriptTransaction => false
  case _ => sigVerify(tx.bodyBytes, tx.proofs[0], tx.senderPublicKey)
}
```

The "Restrict Account" script disables transfers from the account, it also disables modifying the script. This means that any funds on the account can only be used for staking/leasing and paying transaction fees.

### Binary schema

The binary data structure of the unsigned transaction.

{% tabs %}
{% tab title="V3 (current)" %}

| # |      Field Name     |           Type           | Length   |
| - | :-----------------: | :----------------------: | -------- |
| 1 |   Transaction type  | Byte (constant, value=4) | 1        |
| 2 |       Version       | Byte (constant, value=3) | 1        |
| 3 |      Network id     |           Byte           | 1        |
| 4 |      Timestamp      |           Long           | 8        |
| 5 |  Sender's key type  |      KeyType (Byte)      | 1        |
| 6 | Sender's public key | PublicKey (Array\[Byte]) | 32 \| 33 |
| 7 |         Fee         |           Long           | 8        |
| 8 |  Script length (N)  |           Short          | 2        |
| 9 |        Script       |       Array\[Byte]       | N        |

{% hint style="info" %}

* Script is the (binary) compiled script (without "base64:" prefix).
* Network id can be obtained by taking the 2nd byte from the sender address.
* Each [key type](https://docs.ltonetwork.com/accounts#key-types) has a numeric id in addition to the reference from the JSON.
* Integers (short, int, long) have a big endian byte order.
  {% endhint %}
  {% endtab %}

{% tab title="V1" %}

| # |      Field Name     |           Type           | Length |
| - | :-----------------: | :----------------------: | ------ |
| 1 |   Transaction type  | Byte (constant, value=4) | 1      |
| 2 |       Version       | Byte (constant, value=1) | 1      |
| 3 |      Network id     |           Byte           | 1      |
| 4 | Sender's public key | PublicKey (Array\[Byte]) | 32     |
| 5 |   Includes script   |      Boolean (Byte)      | 1      |
| 6 |  Script length (N)  |           Short          | 2      |
| 7 |        Script       |       Array\[Byte]       | N      |
| 8 |         Fee         |           Long           | 8      |
| 9 |      Timestamp      |           Long           | 8      |

{% hint style="warning" %}
If the transaction doesn't include a script, the script length and script should be omitted from the binary data.
{% endhint %}

{% hint style="info" %}

* Script is the (binary) compiled script (without "base64:" prefix).
* Network id can be obtained by taking the 2nd byte from the sender address.
* Each [key type](https://docs.ltonetwork.com/accounts#key-types) has a numeric id in addition to the reference from the JSON.
* Integers (short, int, long) have a big endian byte order.
  {% endhint %}
  {% endtab %}
  {% endtabs %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.ltonetwork.com/protocol/public/transactions/set-script.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.