{
  "manageEntity": {
    "action": "Save",
    "entityId": "269884300",
    "entityType": "Track",
    "nonce": "0x7c6b59902feca9f21ef217c00a50a25d69f373a6c296c5b4c97c3479d7f45fab",
    "signature": "0x23d90f94a8de963101bf7b6ac84c9fc66cdaa529cec5fabb9f2adbf9b0ff7df253546cefb79f54149ef36c20f80354acf2e0b7dcd0c12a6b93993b07dd11fe341c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}