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@Zayedsakib had answered this question so I won't repeat it..

However I do like to stress that posts and comments don't actually get deleted on the Steem Blockchain, when you are editing a post/comment on Steemit, what you are actually doing on the blockchain level is to "overwrite" the comment and have Steemit show the new comment instead of the older one.

In fact even your upvotes and flags are registered on the blockchain the same way if there is any changes.. that is why you don't get your Voting Power back when you cancel a vote.

Accessing to any of the Steem blockchain explorer and you can see all of it.

Imagine you can leave a "hidden message" on the Steem Blockchain by editing it as soon as your posts gets registered on the block.

You can use: https://helloacm.com/tools/steemit/deleted-comments/

Although right now it's currently offline, but it should recover deleted posts /comments on the steem blockchain :)

For the edit, Just replace the url from say steemit.com/linktopost to "steemdb.com/linktopost". From their you will see an Edit History of the said post

You can, but you cannot do it directly using steemit. However you can use some other third party websites based on steem blockchain..Few examples would be

*steemd.com
*steemdb.com
*steemblockexplorer.com
*steemworld.org

Use any of those and go to the target account by using a similar url like this.

steemd.com/@(username). go there and scroll through the accounts activity.

There you will be able to see both delete history and edit history of comments and posts..

I've tried this recently on a post but these tools made it hard to see the actual edit history, because when you go to the page of the post, there's no history still. You only see that it had been edited. Maybe I didn't find where the link was though...

Oh what do you know, there's an edit history tab for steemdb. Not sure how I missed it.