{
  "manageEntity": {
    "action": "Save",
    "entityId": "905305747",
    "entityType": "Track",
    "nonce": "0xafb8d4cca95e4057d54cd36478be905218cfe00481aaa56bc14d2266ac1b3206",
    "signature": "0x4a8c9070875e9bef26968d5159540f2c344336fb03d0df803b0baa0d82c7a22677ef0188d7e3b21de2fedd0d4dd8b03b113358a276132eef3a57eeb19cde2e2b1b",
    "signer": "0x9118544389fdF944C91fbf793f23D9ad02b34dC9",
    "userId": "103748"
  }
}