{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x420c3c75dcf5eab9f6bf25782525d1b1915920177eb0455676eccd54cfda1a60",
    "signature": "0xefda1912ba5dea9f022d83f54af925e253bf70233e2e4af4feb3dd6501d10dd475b2198c94734d365e62511eb4f5e648138e28098c7ada05afa7ff2b5cecfb581b",
    "signer": "0x18Fc13Cf0C3d527f2Cc0b178b0274A0ADb45E3C7",
    "userId": "81067260"
  }
}