# Storage and Schema

## Engagement Structure Defintion

### **Definition in Go Struct**

```go
type Engagement struct {
    Data struct{
      Operation  string `json:"operation"`
      Target     string `json:"target,omitempty"`
      TargetType string `json:"target_type,omitempty"`
      Content    interface `json:"content,omitempty"`
    } `json:"data"`
    SecondaryKey       string `json:"secondary_key,omitempty"`
    Address            string `json:"address"`
    AddressType        string `json:"address_type"`
    SecondarySignature string `json:"secondary_signature"`
    Provider           string `json:"provider"`
    Version            string `json:"version"`
}
```

### Parameter Definition

<table><thead><tr><th width="216.33333333333331">Parameter</th><th>Definition</th><th>Note</th></tr></thead><tbody><tr><td>operation</td><td>The type of engagement</td><td>These values are supported right now: create, follow, like, dislike, comment</td></tr><tr><td>target</td><td>The target of this operation. </td><td>For example, when operation is "<strong>follow</strong>", the target is the user addres, when operation is "<strong>comment</strong>", the target is the txid of the content.</td></tr><tr><td>target_type</td><td>The ID format of the target.</td><td>Right now, "<strong>evm</strong>", "<strong>ar_tx_hash</strong>" are supported</td></tr><tr><td>content</td><td>Based on different operations, it holds different information</td><td></td></tr><tr><td>secondary_key</td><td>The signing secondary key</td><td></td></tr><tr><td>address</td><td>The address of the user</td><td></td></tr><tr><td>address_type</td><td>The type of address</td><td>Right now, "<strong>evm</strong>" is supported</td></tr><tr><td>secondary_signature</td><td>The signature of this data block signed by secondary_key</td><td></td></tr><tr><td>provider</td><td>The SDK or software which generates this data block</td><td></td></tr><tr><td>version</td><td>The version of SDK </td><td></td></tr></tbody></table>

## Example

**create**

```json
{
  "data": {
    "operation": "create",
    "target_type": "ar_tx_hash",
    "content": {
      "language_type": "en",
      "publish_time": 1669536553,
      "title": "title",
      "content": "content"
    }
  },
  "secondary_key": "0x89a04eb167a482659f1b8e0e8c597f69f5b1d4e96652feccf4b01710a45ac6c8",
  "address": "0xF2FCeCEacA2bDC9781fe920Af9Cdc20dB2cea00D",
  "address_type": "evm address",
  "secondary_signature": "0x8778ce9cb1f1ac39627b3effdda0ae48e66e185528ea17825863fb0e710420f8eeecea468e98e7e6f32d93c03a4f12719de578fd86dbf07cb925f0b79023ac01",
  "provider": "readon.me",
  "version": "1.0.01.beta"
}
```

**follow**

```json
{
  "data": {
    "operation": "follow",
    "target": "0x5F5Df3C0AD7579D91127BDC2d112a86273d28fC3",
    "target_type": "evm"
  },
  "secondary_key": "0x89a04eb167a482659f1b8e0e8c597f69f5b1d4e96652feccf4b01710a45ac6c8",
  "address": "0xF2FCeCEacA2bDC9781fe920Af9Cdc20dB2cea00D",
  "address_type": "evm address",
  "secondary_signature": "0xb0c9d00a1417ef6ffc3885e43d98611a5845d59fceddabab4dc4586bd85500f3e2791b83c5a8282a3ebaa9f937c881e0e28037a84061ffe5c6a86db639a3f008",
  "provider": "readon.me",
  "version": "1.0.01.beta"
}
```

**like**

```json
{
  "data": {
    "operation": "like",
    "target": "--Qq0ZpzQenKZAGMebqdvRAL2u1POvRUkh_MzauWxww",
    "target_type": "ar_tx_hash"
  },
  "secondary_key": "0x89a04eb167a482659f1b8e0e8c597f69f5b1d4e96652feccf4b01710a45ac6c8",
  "address": "0xF2FCeCEacA2bDC9781fe920Af9Cdc20dB2cea00D",
  "address_type": "evm address",
  "secondary_signature": "0x5f41dcb2532dc063ece3a9eef2aa89730f5e14e6af3cfa0a91e42371800f58e70442fbe8f8f2bbccdd6c1dc81fd064e0fdab385c35e84e7930b7ec16ff9abb0f",
  "provider": "readon.me",
  "version": "1.0.01.beta"
}
```

**comment**

```json
{
  "data": {
    "operation": "comment",
    "target": "--Qq0ZpzQenKZAGMebqdvRAL2u1POvRUkh_MzauWxww",
    "target_type": "ar_tx_hash",
    "content": {
      "language_type": "en",
      "publish_time": 1669536554,
      "content": "comment content"
    }
  },
  "secondary_key": "0x89a04eb167a482659f1b8e0e8c597f69f5b1d4e96652feccf4b01710a45ac6c8",
  "address": "0xF2FCeCEacA2bDC9781fe920Af9Cdc20dB2cea00D",
  "address_type": "evm address",
  "secondary_signature": "0xb9722091ab506fadcfb1f82bdab381110153a0e180f2f63a7791041fd946699cab1d09747ef14264b8eb709ff619ae1dab7d79ce99d1308e0b5785f12985dd03",
  "provider": "readon.me",
  "version": "1.0.01.beta"
}
```


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