{
  "manageEntity": {
    "action": "Save",
    "entityId": "1544288004",
    "entityType": "Track",
    "nonce": "0x1d00d733984dc4b7e96e982e7c9eb4d3738920e389c8209107cd3a7494af94a8",
    "signature": "0x816d29c7c048e8b32d348ddf10a2744c1ad42b1a18208518b388d1b899440f2e313b6b33dd29333d2ceba91dc743d8ff0f6715aad3c1f7d659af3134be5a6dca1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}