{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xd90a1c18bed641ecea33f012225d5a195fe0f324c5c6b1f3c485b8597d2f1c84",
    "signature": "0x74309f9fb978c0bb3bb1ca14408ba2ab997fb41ff3f4d203c3971bbbfa80698369f124bd9b6ba387e2089c99bb81f60ea15dd0ef7a5d4b60858263546cbd6c1b1b",
    "signer": "0xF3A94D6e0Ea920B336e33180e0F34f028Aba8F5f",
    "userId": "371177303"
  }
}