{
  "manageEntity": {
    "action": "Save",
    "entityId": "495988653",
    "entityType": "Track",
    "nonce": "0xe19abe87df7511183ac7f2ca2f88f8b2880009d9543d5295dbc0bd4c5003a6bc",
    "signature": "0x8449ec7a2bd6832ff5fd708749267808dabf1c129c9c4adc99504f83b20333f91e40957d33d04119a025688ee89aab86787d6e58317565c9d5a8c16b3d7a85bf1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}