{
  "manageEntity": {
    "action": "Save",
    "entityId": "1945947603",
    "entityType": "Track",
    "nonce": "0x2b8799b7c146a0e79be840220256077bcf375ca8b21bafbf2d8fc16203e1a9b0",
    "signature": "0x9021775b73a51f901aec535084dc90a46f4fc760a349c1f5a59666179b1680715340d6676e6e053754760932d91284df0f76edb7fc2a7f1a09c67002bb9d56791c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}