This is the original SourceCred presentation that gave a high level overview of the system, the problem it solves, and how people can get involved.
This condensed a lot of information about SourceCred into a concise and digestible format. This made it easier for more people to discover and learn about SourceCred.
A 10-20 minute presentation on SourceCred.
The actual SourceCred protocol.
@decentralion wrote, designed, and gave the SourceCred at the Berlin Open Source Salon talk.
@decentralion also wrote, designed, and gave the SourceCred: Reputation and rewards for open-source projects talk.
Both talks are very similar, but slightly different. As such they seem like an evolution of the SourceCred Overview Presentation.