# Follow Node

### Introduction

The **`follow`** node is an integral part of the MetaID specification, allowing users to create and maintain their social relationships within the blockchain network. By utilizing **`follow`**, we can significantly enhance the social capabilities of MetaID, providing users with a richer and more in-depth interaction experience.

<figure><img src="/files/PQv6jFAOc4XXrn10g2wp" alt=""><figcaption></figcaption></figure>

### Spec

The script format for the **`follow`** protocol is as follows:

```jsx
OP_FALSE
OP_IF
	metaid                           
	create                          
	/follow                         
	0                               
	0                                
	application/json;utf-8         
	{metaid}                        
OP_ENDIF
```

#### Conventions for **`follow`**

1. In the **`follow`** format, **`create`** represents a follow action, while **`revoke`** represents an unfollow action.
2. In the **`revoke`** operation, the **`path`** must locate a valid `PIN`, and this `PIN` must be a valid **`follow`** `PIN`.

### Example

Taking user A following user B as an example:

* User A's MetaID: **`c08c4e96514ee5c4f91b6df3de7a42f797a36af7265918a6b74d5198f87682ad`**
* User B's MetaID: **`2464ad8d35e601f8b73c80976104ff00e878f58dc2f2936ec3a269fe34d962c2`**

The script operation for user A to follow user B is as follows:

```jsx
OP_FALSE
OP_IF
	metaid                         
	create                         
	/follow                        
	0                              
	0                              
	application/json;utf-8         
	2464ad8d35e601f8b73c80976104ff00e878f58dc2f2936ec3a269fe34d962c2 
OP_ENDIF
```

After the **`follow`** `PIN` is committed to the blockchain, the generated **`pinId`** is: **`dcvv5d4377f36c7c2466259593d0d4a0c1e5d7ec19500e082ce1eea3993f22b1aac1i0`**

Then, the script operation for user A to unfollow user B is as follows:

```jsx
OP_FALSE
OP_IF
	metaid                         
	revoke                         
	@dcvv5d4377f36c7c2466259593d0d4a0c1e5d7ec19500e082ce1eea3993f22b1aac1
	OP_0                           
	OP_0                           
	OP_0                           
	OP_0                            
OP_ENDIF
```

Both follow and unfollow operations take effect immediately and generate corresponding records on the blockchain.


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