{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x7a2f60e588f1a636c2634fd4efb88d3bdd9613296f4d3633c67e770332b9d178",
    "signature": "0xa74e347bde860a78c16dacdfa690e281bf8e8371c033ee4c00aa94d8fd48776a71a43f5bffa838ff0f9c7a9fa6944c80c33cf7b282494fbcee9dba8729402e3e1b",
    "signer": "0x789F486f6C0BEcF3D1E3B3D82c61D526Fc7Edca6",
    "userId": "57299423"
  }
}