{
  "manageEntity": {
    "action": "Save",
    "entityId": "738541",
    "entityType": "Track",
    "nonce": "0x90669b903170b461a6a6555b81850503f985edc422fce55ae67a01682cb793dc",
    "signature": "0x8f000a8c776763373a3f26ec3331feae200d8cc0c4a5e763400e561665c232d86224b212d2345e4889ea9dae407fc5c85bb2c98d3e9317bfa1642e420b1095f41c",
    "signer": "0x13f8ca0832087662A9bA298e1F708853B8615826",
    "userId": "990836999"
  }
}