{
  "manageEntity": {
    "action": "Save",
    "entityId": "572097249",
    "entityType": "Track",
    "nonce": "0x750fc3a864aef98163b09fcbb07472947e8bb3c7167ede9f0719ebd9a373d97f",
    "signature": "0xe1b33e1a22f2ea947fe0e803de21353217f9527ed0f60106b3db6324063569c830839c04326aec7ed51d4990bee1ddc37212117488fae3689185ab6b73dfd2d01c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}