{
  "manageEntity": {
    "action": "Save",
    "entityId": "640948251",
    "entityType": "Track",
    "nonce": "0x03d50da7b0d7ef75ea89fe571cd54ec32862d1b4a3fbadc30420aa10ccca2e87",
    "signature": "0x98a53698048ec24dad673374aa3f8836fb0378bf7d7d0e7fc70c42b5c365ddb91f08a0f663604b69ab9d6cf4b9150a8db240a62c7efe562327dd6b405fd77ad01b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}