{
  "manageEntity": {
    "action": "Save",
    "entityId": "766538591",
    "entityType": "Track",
    "nonce": "0x38ea074ab96b5e503e51fbdcb65e0ca64ad2105f023ce4b5bd81f400bf55d82c",
    "signature": "0x58f153b9b5aa5f45cc332f92ac4ae68ad0cbad2d7b025a259264a88d47cbe3ef73fdf828089475544961c7dabd83f492267bda0c96a7697e8f31a44696eb60f91c",
    "signer": "0x838a9EB91B1b530345f7B1C70Fd9970DBa8b9b1B",
    "userId": "204660391"
  }
}