{
  "manageEntity": {
    "action": "Save",
    "entityId": "1816310749",
    "entityType": "Track",
    "nonce": "0x8dbf3bf36c250c43804c3f866a3321da7b72777668b845d75fa317a387c2d4ef",
    "signature": "0x111725a7d71431575442e10686f01d87edb08d2e7856fb144e3a76137561f4682a6541b654439cb57cc0a24474df6268a57c139ccdf4ccbf6f9ad94dd7f0e0721b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}