{
  "manageEntity": {
    "action": "Save",
    "entityId": "458575921",
    "entityType": "Track",
    "nonce": "0xf758fca81f8b5b5f29fbce6e16ceed955918af20314e4a33a8305a7325c64fd5",
    "signature": "0xbf8cc0b01d793d3e714c805afdd0b3b2c26afaefc695e61ffdd28416b2b8ecbc1e6160b48e7f5499bb2ebfb4fab799f14fee083dd6c7690a6b8ba0fa5cfeee4c1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}