{
  "manageEntity": {
    "action": "Save",
    "entityId": "1500215205",
    "entityType": "Track",
    "nonce": "0x3b7d4b31b6a3f6190fa0793e7d6f3b88cd0fe231113bc80adbd590e0b43b5999",
    "signature": "0x354804ad2d7c801d68c8a915e8884987e1377474e7bdd9aec8b627ab03559b3b5a732b7410ebf0bc8a96ee191dfec06ebb9c5ec69e6692e38f6c7d2632a178c41c",
    "signer": "0x7B3AFAc08245Ef9d1CFfF7f7cdDBCAADE68f94E3",
    "userId": "230426"
  }
}