{
  "manageEntity": {
    "action": "Save",
    "entityId": "1849539432",
    "entityType": "Track",
    "nonce": "0x66335f899065a4de6a4f9b834159f4fb11bd7d85a868989cb23696327d7d5eec",
    "signature": "0x6c99373cf282198f7689ece3b0f69de91b02ff64ba172be83c849749a352daf2755cd188af2b010e783737f45e329b366d52b4af86ec3994078f23776533a7ee1b",
    "signer": "0xdB791822A11f5aDc830669bdADa8121a4558D7A3",
    "userId": "347139808"
  }
}