Greetings @advokate, thank you very much for being a part of SteemitCryptoAcademy this fourth season and for your efforts in this 4th task of the fixed courses for beginners.

Your grade on this assignment is as follows:

Parameters	Grading
Presentation Style (Markdown Usage)	1.7/2
Following Standards (Guidelines)	1.5/2
Quality of Content (Subject Matter Mastery)	1.7/2
Spelling and Grammar (Writing Fluency)	1.6/2
Originality	1.5/2
Total	8/10

Remarks:

Good performance of the assignment, although you need to improve in some aspects.

Try to improve the presentation, use of markdown and grammar, justify the text.

Research a little better, for example this is not true (what is in quotation marks):

When the block becomes blockchain, it is impossible to alter the information in a Blockchain because each of the blocks contains its own hash and the hash of the previous block "(the unique code of the last transaction that was recorded)" so if any change is made in the block, it affects the subsequent blocks and the previous block will not match the next one and this can be easily detected.

You also repeat this in your explanation of what the previous hash is.

From my explanation above about the previous hash, the previous hash is the third component used to verify information in a Blockchain. "The previous hash is a unique code of the last transaction that was recorded in a block" that is passed to the subsequent block that ensures the continuous linking of other blocks that make up the Blockchain.

The previous hash is the result of all the hashes carried by a block, these produce a unique hash via the merkle tree. A very interesting way in which the blockchain saves a lot of information by structuring it. Do some research on it.

Try to do better research for next time.

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Thank you @advokate for your effort in carrying out this publication, I hope to continue reviewing your future tasks.

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