{
  "manageEntity": {
    "action": "Save",
    "entityId": "303758391",
    "entityType": "Track",
    "nonce": "0xd074159e4f616f1a8295b59b3881129dbaad79b543e39166926913677384965e",
    "signature": "0xebe0445443d7447a96a4df027de0493c1c2c2ccff247df7ded2072531e3a38a521dfb82f8578e83ac5356f941607908c4c8a3a04cdbeba9762f2b561385fc93f1b",
    "signer": "0x27204C77Baa4a510c92A96A4ba3661CC53EE568E",
    "userId": "35918963"
  }
}