{
  "manageEntity": {
    "action": "Save",
    "entityId": "1098408500",
    "entityType": "Track",
    "nonce": "0x75e6b171099060bc22d363a652fef7cdffe8532916c43cc027b09d428ca140a0",
    "signature": "0x44fd20903824b2df2502323ffe9ac00f6fa79e7f5de4960009436bba96e5ac47348bb9f6de3f103d42627d7376dc524c419ac69cf1c60dc8c2c6ab122a5167981c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}