{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x12d4ec2664c6f9d6c5b18c603d58e1f6a31d55a4f33f619caa340bec5095f412",
    "signature": "0x850bf6203809cbdc82709b15337d03c2252d71c34ad34667c695afa03ddbf1b14abd954f6540e6486e6372a50cc2ccd250d2ba8ba7c0efe5318efc61b8fc637c1b",
    "signer": "0x7A4D84dE782cBCF49AB1f615578A356b09d6e679",
    "userId": "62949483"
  }
}