{
  "manageEntity": {
    "action": "Save",
    "entityId": "620312187",
    "entityType": "Track",
    "nonce": "0x8c3647226452a7a379992e17424f611fc924c1bb9e734ea3ccf9b10a8b824438",
    "signature": "0xd9720f035185cd8a8d9990b01a7623135a7af53643364cee0b735eb789f7926365916bd54b06e4760675fad55a764c648d6905893fc30d4d311c7f89324d33581c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}