{
  "manageEntity": {
    "action": "Save",
    "entityId": "531770481",
    "entityType": "Track",
    "nonce": "0x1c331f6dfbfae297ea2ddb991bb4ed174ac05e5750619ccd75550cff3944102e",
    "signature": "0xbbbf6d46fb3327e24f2e61a1bad7d0eeaa6d37c9c1f4024abd2e0f38c4307b864f45c7882b6f2466704a887bcd5843cf5aa748957a7dbba03dcbc8cb25e30a861b",
    "signer": "0x03e9Caf2aeac5a0F0e4Be56410d67A4148D38Fd4",
    "userId": "47828528"
  }
}