{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x63c6f622d1ed6c16685bd4e435850f798706607ab3299deee62edca0c12cb27a",
    "signature": "0xef042696ef42cb1bf2e7351aad57f5c62787dfba443cf5fef128db89d3259f5b5bfa03b5d355c5f1e6b772169d18c8520850f5eb822a52f133565498b21ffab71b",
    "signer": "0x8f296DABb4945730734aa157F7EAA693b519b295",
    "userId": "350604703"
  }
}