{
  "manageEntity": {
    "action": "Save",
    "entityId": "903522780",
    "entityType": "Track",
    "nonce": "0x9787e36076543273263aff3c1bfc8ea2dc3afe97e69329f8c514706f01c3106a",
    "signature": "0xd34075fe77fb0aaeaf5464ecc5075327988bf865e882002544fdda12e84b27841f2ed25163eeaa376853c63e0f7cab4ed90af8927e4047547debf5eaabd508661c",
    "signer": "0x36d29AA5C780341f3b35bDE6c1411a7Abcf8794C",
    "userId": "571117272"
  }
}