{
  "manageEntity": {
    "action": "Save",
    "entityId": "1848806037",
    "entityType": "Track",
    "nonce": "0x3c1631d683470e9f3b907e7de1e89ec459fb70957077fa5f09c355e4d9ff1b79",
    "signature": "0xbce6d93d5687cd965c256602452640a7c3b1175359ee1ab2984e74540080624d3083ff8af125c6c3d96d335d85bdba173d1035fc5fd54cb5eed67e6e548fbc391b",
    "signer": "0x16e1A840950aa44eF9AB748462Aa51EA80bb91AF",
    "userId": "375137667"
  }
}