{
  "manageEntity": {
    "action": "Save",
    "entityId": "518945323",
    "entityType": "Track",
    "nonce": "0x7d6e1d21b45abd12a3be7dac61432b51683db85e92436fdd456f32a53b64c3e0",
    "signature": "0xd0eb01a3c4a119788d61c3c73911629f972db792ecf833620e1985b5bbfe1b13114a80a1c85e4bd1fead3d4d038f5b3088a1a0b2a5027d369942d55cca8f28531c",
    "signer": "0x040629E31a68119093b9a0111257C8449c2f8e10",
    "userId": "20"
  }
}