{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xb1eab367d9fb5a45ce6c6963e8cd01fca5f91b804597f5a0afe6ed10c3757e54",
    "signature": "0x83fb96ad872fd32bedeb1383dce8589becd91641626cd2983b270b5d474e09fe5cbf4652b9f7890afaf905576e96d346fece896a709d6b8acfc4308655aa34051b",
    "signer": "0xbDDc142e355Faec928e2e4D64D097F32eFA7Fc44",
    "userId": "228447537"
  }
}