Normally, one of the purposes of hashing a string (such as a transaction) is summarizing the data to save the size because of the space limitation.
If this proposition is true, now assume we need to read the original data and so we need to extract the exact original data (with all details).
Now the question is if the extracted data from the hash data is equal to the original data?
And if yes, is there any tool to do this? (for example, for retrivieng the original data from
SHA256 hashing algorithm).
And if we cannot retrieve the original data from a hashed value, how hashed data can help us for validating an original data?