{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x45be89ef7116b244e7f2af292bb178d53777078e7d89df54c2220b2e9ed0c77c",
    "signature": "0x2c0e78cb4b6d7057f1e0b3e570bfcb64d6d0722d8c578668c2eb189b1df5183a23c2260c10008a730731f8e90b075cfddebf3ad25903ce98f17245875380ee6f1b",
    "signer": "0x4556933C0FaB9C8fD74eBF62D61DDE5430F04D75",
    "userId": "663938311"
  }
}