{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x8b92941cde79670dab182e1c12a8c742f3ae93cda4f6a4d79f6eafbd5306ee01",
    "signature": "0x22ad2ef293c7748af838b411be7e8d8678dc06d46e07b3648a05882fd4345ccb20dac0df3295dda06b4964d7fb97ed88f34fa4aa2072b0eb87027af314ee5b2d1c",
    "signer": "0xfBD8EE6a8F149b22584fBAe95DBfc4F696533620",
    "userId": "385835809"
  }
}