{
  "manageEntity": {
    "action": "Save",
    "entityId": "957458129",
    "entityType": "Track",
    "nonce": "0x767eb7f70d2c31e93dd27ecb81efae41454c7c45c957b658666d99009517b8ec",
    "signature": "0x762dc6b8e34148c6e8021ee431486f445a519578f41545bda059544c4d1ddfdf3b9c9970534326a498213d679855324a3bd98d7facaff0b150f04c96eee6af161b",
    "signer": "0x1d868e2cc29848871636BdCF83a08A975835b6DD",
    "userId": "120328011"
  }
}