{
  "manageEntity": {
    "action": "Save",
    "entityId": "903701251",
    "entityType": "Track",
    "nonce": "0xad599662c69cf2ea6ae5b475889a96095a23188333239199a2fb8bd9da8feb6d",
    "signature": "0x0358971163a3b4882382e248c7b265ab8b90a0c029fac867c422ff8f31f438d102e476877411b87b5ae1a4c987ec904d1f9a704892ae6f654eda79d6f5938d791c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}