{
  "manageEntity": {
    "action": "Save",
    "entityId": "250607",
    "entityType": "Track",
    "nonce": "0xe1f1ec315b01c316a7ffda41a04930102dbe599043b3be806a52b30b02a3a9c6",
    "signature": "0x65d659d73490c71f62b402b588acef4a36bf4ae83e8fc2658fea1379e67e35851eaec031eab0f2cccb77a02c680b1a0b77e29af3d2569669acd842103d3f30311b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}