{
  "manageEntity": {
    "action": "Save",
    "entityId": "940329",
    "entityType": "Track",
    "nonce": "0x4719b5a02a513fb56ca3ef2ea85312deb3b72bb89b553e5739387342276a4c6e",
    "signature": "0x7b425944e527869f1cebd70e0d1b36c49588877e75ca7a7f964c20d713f6b4c557f35aab7078a559c960bb4c43f30c48214a4de4e39c31c292cc97ec89a456311c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}