{
  "manageEntity": {
    "action": "Save",
    "entityId": "448911601",
    "entityType": "Track",
    "nonce": "0x59c249106b9388b3e70f0b311342ec8f85f04780192b9171871baee8140ed9d7",
    "signature": "0x118bf146eb9efe394bc085752586fb180b5824e7f882311a1537ee15c729348d6cfdd21d1a07df46206f32e9c946c7be91fca6736f90a2e7fea6b21b1be42c781c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}