Smart Contract Protocol: Timestamping digital material with Blockchain to establish "legal" proof. (#170)

* Create README for Smart Contract Protocol assignment

Added a README.md for the assignment proposal detailing a smart contract protocol for timestamping digital material using blockchain.

* Clarify the timestamping process

Reorganize and clarify the explanation of timestamping digital material.

Author: edv1n

contributions/smart-contract-protocol/week7/edwinso/README.md

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+# Assignment Proposal
+
+## Title
+
+Smart Contract Protocol: Timestamping digital material with Blockchain to establish "legal" proof.
+
+## Names and KTH ID
+
+  - Edwin So (edwinso@kth.se)
+
+## Deadline
+
+- Week 7
+
+## Category
+
+- Protocol
+
+## Description
+
+A Smart Contract Protocol for timestamping digital material (e.g. git commits) on chain to establish "legal" proof. 
+
+Traditionally, establishing a strong legal proof of copyrighted materials requires an Authority to timestamp the tangible copy of an idea.
+This can be done by mailing printed material to the state postal service, and the postal stamp acts as a timestamp of the material being timestamped. 
+
+In the Digital World, a well-recognized Certificate Authority can provide timestamping services to verify the authenticity of digital material.
+However, not all Certificate Authorities provide this service. 
+
+Some legal states allow proving the existence date of the material via alternative means (e.g., showing a git commit pushed on Github on an earlier date). Still, usually those means are hard to establish as legal proof of the material (e.g. Git allows modifying commits committed earlier)
+
+Here, I propose an alternative method for timestamping digital material. By using the blockchain to timestamp a git commit, we have the chain to prove the existence of the copyrighted material. 
+We can also utilize Git's commit hash generation mechanism combined with the blockchain's tamper-proof property to prove the legal status of timestamped material.
+
+**Relevance**
+
+One of the key areas of Programmable Society is decentralization. It provides a good mechanism to establish tamper-proof properties. It also helps distribute the timestamped message to establish a stronger legal proof state.