{
  "manageEntity": {
    "action": "Save",
    "entityId": "42612127",
    "entityType": "Track",
    "nonce": "0x2d056fa109e3ec772c1365b097d182f93be8d75fb35e53597fc4db2d4b233df4",
    "signature": "0x738c7f511b719a54b9843e21a8d6cb4c00beb1be4dad4a8451a8a120f51bbf4012b2002fb9e0fabd25e3b559024a66f6598fb4e0bdf6efcb13f94df15e28414d1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}