{
  "manageEntity": {
    "action": "Save",
    "entityId": "480250",
    "entityType": "Track",
    "nonce": "0xe2a78ad6d2a77f18cf12b324a924339a50a1230d69a93b22143a1b23d83804d8",
    "signature": "0x05848de2ed34b06439f0c33c2507f9a33edff2d80ae7e3a9b3d43c64f0a75ffd643346e0347fa4e34d11fbca29fe12832df07a25a221565d551dccb5ea9a40101b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}