{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x5aec261cfe84e298a86cd92107db853cfd41e86bdbdb16d3f9e7e41a9a1fbb34",
    "signature": "0x9be24d84e229d53f28ec5dfb5839dce874dee3589fdbce6aa2c044ea3f7a574b74387eaad1af01f7438b3abdcc1bc9690f4d368b3a9aa2da648ac0f0a5b0a30f1b",
    "signer": "0xa52113b8f25d73acd11a98D38EA19ebe55d4a771",
    "userId": "310135321"
  }
}