{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x7c7cd0707711fbdbd53ba295d3d381e7ca419bdfbc22b365bc1a582ba59298f5",
    "signature": "0x707613c4f868e47cfb7bcc8c9c9aecdcf339f7020c50d75d94076c01296e32e565e655e9d46459e98617a083f1093cce96ed4fd395d980f17e33e6766d1acdfb1c",
    "signer": "0x1788E4C39d3326e598F16767C69826869594E359",
    "userId": "116504833"
  }
}