{
  "manageEntity": {
    "action": "Save",
    "entityId": "428367",
    "entityType": "Track",
    "nonce": "0x4d66c485c76837aa64021ba4090fbb2bac3ebb192440873765ed553ca1b705b3",
    "signature": "0x4bdcb1746c496ff366da6082e42486ab41f93a151b3b64d365e3e79e93626ce84ec99c951eacebfa2632fbfe7f494bb61e74b00422b15520891cc4ce13bc611d1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}