با بلاک چین (BLOCKCHAIN) بیشتر آشنا شویم

بلاک چین چیست؟

برای شروع این موضوع باید گفت که بلاک چـین از دو کلمه بلاک ( بلوک ) و چین ( زنجیره ) تشکیل شده است و یک سیستم نوآور برای ثبت اطلاعات و گزارشات است که به وسیله رمز نگاری، احتمال تغییرات و هک آن تقریبا نزدیک به صفر است.

اولین بار این سیستم با بوجود آمدن بیت کوین شکل گرفت و این ارز دیجیتال از بلاک چین برای حفظ و ذخیره اطلاعات خود استفاده کرد.فناوری بلاک چین هم می تواند بصورت عمومی برای تعداد بسیار زیادی استفاده گردد و هم می تواند برای گروه و جامعه خاصی مانند نهادهای مختلف تعبیه شود.

همانطور که در ابتدا گفتیم، بلاک چین زنجیره بلوک ها است که در هر بلاک هر نوع اطلاعاتی می تواند ذخیره شود.در نهایت اطلاعات زیادی در بلاک ها ذخیره می شوند و یک زنجیره را بوجود می آورند.نکته ای که باید به آن اشاره کرد این است که هر بلاک قسمتی به نام هش ( HASH ) دارند که متنی از جنس ریاضی هستند و از استفاده نادرست از سیستم جلوگیری به عمل می آورند.هر بلاک در این زنجیره علاوه بر هش خود، هش بلاک قبلی را هم در بر می گیرد و هر تغییر در هر بلاک باعث تغییر در هش و در نهایت نا معتبر شدن بلاک چین می شود.هر چند که به دلیل راهکار توزیع در این زنجیره، احتمال این تغییرات و به هم ریختن بلاک چین خیلی ضعیف است.زیرا اطلاعات بلاک چین در یک مکان یا سرور مشخص ذخیره نمی شود و هر سیستم به محض وصل شدن به این زنجیره یک نمونه از این اطلاعات را دریافت می کند.به هر کدام از این سیستم هایی که به این شبکه وصل می شوند نود ( NODE ) گفته می شود.پس زمانی که به شکل یک نود به زنجیره بلوک ها وصل شویم، بدلیل دریافت یک نمونه از اطلاعات، احتمال تغییر در آن بسیار پایین است.

در حقیقت می توانیم بگوییم بلاک چین نوعی بایگانی برای ثبت و ذخیره اطلاعات است که کاربرانی می توانند اطلاعاتی وارد آن کنند و کاربران دیگری بر آن کنترل داشته باشند و بتوانند آن را بروز رسانی کنند.اما باید دانست که مالک اصلی دیتابیس یا همان پایگاه داده، کاربران هستند و اطلاعات ثبت شده حذف نمی شوند.

ذخیره اطلاعات در بلاک چین به سه روش انجام می شود :

۱-اطلاعات رمز گذاری شده که فقط افراد معلومی می توانند آن را مشاهده کنند و در صورت نیاز تغییر دهند.

۲-اطلاعات رمز گذاری نشده که همه افراد می توانند به راحتی به آن دسترسی پیدا کنند.

۳-اطلاعات هش شده که اطلاعات در ابتدا هش می شوند و سپس که ثابت شدند وارد می شوند.

گفتنی است در این سیستم، با استفاده از کلید خصوصی و عمومی که از حروف و اعداد تشکیل شده اند، می توان هویت دیجیتال بوجود آورد.در واقع کلید خصوصی مانند یک رمز خصوصی است و در نبود آن کلید عمومی به کار می آید که ترکیب این دو، امضای دیجیتال را بوجود می آورد.در اصل این سیستم کاربرد های بسیار زیادی دارد که گل سر سبد آن ها بیت کوین و سایر ارزهای دیجیتال که غیر متمرکز هستند می باشند که امکان بسیاری از تقلب ها را از بین می برد.همچنین در مواردی که نیاز به فضایی مناسب برای ذخیره سازی با اعتماد بسیار بالا نیاز داشته باشیم، این سیستم فوق العاده عمل می کند.

به عنوان مثال برای سازمان ها و نهادهای مختلف این سیستم بسیار مفید واقع می شود زیرا اعتماد به آن بسیار بالا است.یعنی زمانی که از اعتبار، اعتماد، امنیت، حریم خصوصی و … صحبت می شود، بلاک چین یکی از بهترین گزینه ها می باشد.

یکی دیگر از مزیت های این سیستم این است که حتما نیازی به ایجاد یک بلاک چین کاملا جدید نیست و از برخی انواع باز آن می توان استفاده کرد و مشکل را حل نمود.البته لازم به ذکر است که با وجود تمام این ویژگی ها، هنوز هم استفاده از این سیستم به شکل وسیع انجام نشده است اما می توان این نوید را داد که قطعا در آینده ای نزدیک و توسعه زیرساخت های مورد نیاز، به شکل گسترده تری از این زنجیره استفاده می شود.

اطلاعات تکمیلی را می توانید با شرکت در دوره های سایت شمع سبز فرابگیرید.

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