{
  "manageEntity": {
    "action": "Save",
    "entityId": "647847354",
    "entityType": "Track",
    "nonce": "0xa1afbc837d6705dc3c59d8cb27376d46626883a7568ab8f9efd1e05fe00dfd8a",
    "signature": "0xbc21fd3890dfde79441fabb4720639dbb7c1a53126e48558ba12b076c6b7154c7d0cafdf5f8126280e34b0ffffe0a276ef437ec32fe3f8486df8a0efcaaa65ce1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}