{
  "manageEntity": {
    "action": "Save",
    "entityId": "74660",
    "entityType": "Track",
    "nonce": "0xac28bd12b24321733478eeeca294e430fa67e9b4352c466999c4c9fb92386f4c",
    "signature": "0x41228fe8da58612cdf9234c045468ab6d1eda6d3dd76ef3815a03fc1214fb7165d396f63c2193b321172645aaa6a2c460f3dd5edbc2795ba82fdbf89a55053db1b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}