{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xbff86053851a56050ecbf7c53634bead53043f919e2e4a6033f9b41051c72a2b",
    "signature": "0x63b7eb47be23ee9f51e6cbd0713c26a50870c0b1f9187c2f1697fa67c1fdd9826f87aa538cdda3e62e045df5f6fed20fa865aaf24a87bc3858d63df59292cea11c",
    "signer": "0x8E3A4E1A0d1Aa7628E0FDbc872062F921A449403",
    "userId": "552753858"
  }
}