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sidebar_position: 4
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# Feed

A feed is a special type of tangle, where the root is a predictable (by any peer) message with no content.

```mermaid
graph RL;
  D--"A"-->C--"A"-->B--"A"-->A;
  F-->E-->C;
  G-->D & F;

style A color:red;
```

Root:

```typescript
interface Msg {
  data: null // MUST be null
  metadata: {
    dataHash: null // MUST be null
    dataSize: 0 // MUST be 0
    account: string // MUST be an ID
    accountTips: null // MUST be null
    tangles: {} // MUST be empty object
    domain: string
    v: 2
  }
  pubkey: Pubkey
  sig: Signature
}
```