{
  "manageEntity": {
    "action": "Save",
    "entityId": "458419711",
    "entityType": "Track",
    "nonce": "0xeb951b14a8f6ab295de28d085b486d6394ab20105f411d72f4542b65811704bf",
    "signature": "0xe06c3ff0d16210f8f2528e15b42afba00b02c17d6ddaae47d60c050d5dfa537271376cdeef4505c0765ec56e93e0ecb90c33a05cf49465366e1511121e1396101c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}