{
  "manageEntity": {
    "action": "Save",
    "entityId": "1873814635",
    "entityType": "Track",
    "nonce": "0xac0bfc639f5021852cbe64a2cb3d1129e8cdc2fa8759d2545ebf4185450c126c",
    "signature": "0x0a2a8c9018d145a9e95a44f1f8e0b81c6fdc1def32227b662b75e6f4f0fc118f53a749f788d2f3f914cc792cf47b5803cb0ccd76cf22ce4fd91fd272df6ea2741c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}