{
  "manageEntity": {
    "action": "Save",
    "entityId": "2138028025",
    "entityType": "Track",
    "nonce": "0x17015584811e55b41666c11c2e89a292323ce639f3aedad4be206724f5080494",
    "signature": "0x54b6ff359add0b9837a5e9e6bdd564b070ea67c2c4a4b6f11a82268cc574db1b29912bf87915533138dbc0966c367683ae6cfd1d31977f118c71651488e6f8b31b",
    "signer": "0xf39D3e3Ea8b52437CD50Aa1EE0BD56d4431FC6CD",
    "userId": "183245"
  }
}