{
  "manageEntity": {
    "action": "Save",
    "entityId": "452089",
    "entityType": "Track",
    "nonce": "0x4e579ef137072ed5262e66aa8bbeca0b151047a953d147208c5cbc0f7c23e20b",
    "signature": "0x2440a294eb85446ca8fc0548b39b9d14e215dbef9ebc106f0092b81893ba4b321b610ae5616ccd37de1af477521a684a5568d5dcee99380b8c56790e4584d2031b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}