Chapter 1 improvements (#89)

[nathalie-ckc]

Not doing Point 1 of Github issue 89, as stated in the issue 89 discussion.

Point 2: Remove video on DLT vs. Blockchain

Remove the video, which confused students. See Discussion forum post: https://courses.edx.org/courses/course-v1:LinuxFoundationX+LFS171x+3T2017/discussion/forum/i4x-LinuxFoundationX-LFS171x-course-3T_2017/threads/5a78c95684452a081800089c.

Extend explanation that Blockchain is just a type of DLT by mentioning 2 other types of DLTs.

Point 3, Modified Point 4, Add missing link

Distributed Ledger Technology (DLT) > Blockchains (Continued)

3. Definition of block shouldn’t be split up with mention of bitcoin concepts in between. I put the bitcoin example after block is explained, for better concept flow.

4. Nonce relates to the Bitcoin example, so indicate that this list of 4 pieces of metadata refer to the Bitcoin example (which continues with the Merkle Tree section in the next slide).

Bonus: "or a brief history of blockchain technology, please click here." was missing the link "here". Added it.

Point 5: Remove conceptual speed bump

Distributed Ledger Technology (DLT) > Blockchains (Continued): I propose to mention that Merkle tree root will be defined on the next page, to remove a brain speed bump for students who don't know what a Merkle tree is.

Signed-off-by: nathalie-ckc [email protected]

[tkuhrt]

Thank you. I will wait on merging this, but I will forward to Flavia for inclusion in v2 course. I would love to get all the updates in place.