{
  "manageEntity": {
    "action": "Save",
    "entityId": "190465468",
    "entityType": "Track",
    "nonce": "0x9f9370da03519fccd8d0fac95250dac3f45faeb36b93b670acffd1074677f940",
    "signature": "0xd84e50d43a82cac3295a9617cf921557f1153de3e096a0776e27551c0c4bb62535c7820f14f01b423c610b3be6580a92341a6631603dbf5641087a2832228b6d1c",
    "signer": "0x45c4f1dcE13eeF476C74C5758696D56137253980",
    "userId": "824478223"
  }
}