{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x573a15080b4a120dadeb0ecc3e6058a0cdabeff4e7138842d28490372e03c6b1",
    "signature": "0x05fcf9b1e1f639ff69cb8d4131f247421691e564fa45b0352e7f572d80ef4aef6cb0fee9d2537f9b4b74efc784061989f49183de82ff6dd77e8f4beeb6a39dbc1b",
    "signer": "0x773bdCC3FF748BF61b779D7884757ba28d661E4C",
    "userId": "513169940"
  }
}