{
  "manageEntity": {
    "action": "Save",
    "entityId": "1438558663",
    "entityType": "Track",
    "nonce": "0x9d14dc63a8f7a11d3691da5c34d2aeacfe57af420ff329453d242440f3761dbd",
    "signature": "0x219f904e07f6b3a2201d9caf410688f72a3a647decb1362055600577e814a29b40b0c3c12d51615d71c33a5603dd15120e253c537c955fd1325afc3b817e8cb41c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}