{
  "manageEntity": {
    "action": "Create",
    "entityId": "280694509",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"entity_type\":\"Track\",\"user_id\":806873848,\"entity_id\":592641584,\"body\":\"Cool song\",\"comment_id\":280694509,\"track_timestamp_s\":184,\"mentions\":[]}}",
    "nonce": "0x001a46ad60a6226e7cb275622bb232eff4c135805c7460d223d05104035047f0",
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    "signer": "0x96818aB6687d2E9bA070EB1d6843ef7BfEF5cDa4",
    "userId": "806873848"
  }
}