{
  "manageEntity": {
    "action": "Save",
    "entityId": "620562",
    "entityType": "Track",
    "nonce": "0x6d47d2222bc92532e2c8062b37dd460dc70f632f379bf8e6c0913017f343366a",
    "signature": "0x0558f3f52cb4033ddacb2e01c1959d245edd96ead10938e28d67d3124686abe3077e356dfe4385ea65802596fe2c0f16977ff864176371c22ad36f1b393dd0511c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}