{
  "manageEntity": {
    "action": "Save",
    "entityId": "642458289",
    "entityType": "Track",
    "nonce": "0x827a73999ab9f09961b2cfcd2f59155c72d8af498de6a0b30553bc72e80e8525",
    "signature": "0x41292f8a023e0773633fb72bb82277965e3358d0afe9690a2957b66b8d80ff696838c5535ae359a8b48c8e104f21b84649fc704cf270ba8e35155f995fc707531b",
    "signer": "0x6068Da6B0a791A756931bE32de98D46eBb95890c",
    "userId": "475275462"
  }
}