{
  "manageEntity": {
    "action": "Save",
    "entityId": "778435627",
    "entityType": "Track",
    "nonce": "0x97e445977bb01358dc7e60116f2c0b008a3ef633223a5ce916fa91b1dbc1a420",
    "signature": "0x7b222afcd066ef62de3a47c005df19cfaa924a747a3aceae9620fb35597569ed2b1b8dbb68c14eafa66eabb1eba65d94f8fd2356e14ff4755ac941f3935221761b",
    "signer": "0x0E71C12c426F5C9206F778713f48B60477CA943b",
    "userId": "29088079"
  }
}