{
  "manageEntity": {
    "action": "Save",
    "entityId": "493095",
    "entityType": "Track",
    "nonce": "0xa7da72e9173831fe2cb20ea516365e170429dc9b0972631433b51702719189dc",
    "signature": "0x44d34883a57ba27f5ed7e4c8141b54dd0589c1624f24f598db13ecfea2d34753587b54fe027a507a4aa6cf99d476965b0a491d7b97e16c920230e54bf9aec1e41b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}