{
  "manageEntity": {
    "action": "Save",
    "entityId": "1488839202",
    "entityType": "Track",
    "nonce": "0x49f66511a36f6b0d0a718b761c7fa319b7dab7c95480357a8687efe07b3e54d7",
    "signature": "0x748d25ea429a031057f0e8a00d61152348b800042e5737c8bd2c0ea098adc4aa003398831cf09b9c5f50c52ef20e1acf01b0889e90381d8913238319fef22a0f1c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}