Update software-supply-chain-workshop-4.md

Author: monperrus

software-supply-chain-workshop-4.md

@@ -15,7 +15,6 @@ This workshop is organized in the context of the [CHAINS](https://chains.proj.kt
 * Location: KTH, Stockholm, Sweden, [Salongen, KTH library](https://www.kth.se/places/room/id/2ce773d5-3190-4588-8618-27ea2822000b)
 * Date: Friday 25 April, 2025
 * Time: 9h-17h
-* Registration is free of charge but compulsory for the sake of lunch/fika planning. [Register Here 😄](https://www.kth.se/form/678a135a19c08f75a45b7dbd)
 
 ## Program
 
@@ -28,7 +27,7 @@ This workshop is organized in the context of the [CHAINS](https://chains.proj.kt
 | 1100   | (duration 15+5 minutes each)                                                            |
 |       | * Julien Malka, [Does Functional Package Management Enable Reproducible Builds at Scale? Yes](https://hal.science/hal-04913007) |
 |       | * Aman Sharma, Causes and Mitigations of Unreproducible Builds in Java [slides](https://algomaster99.github.io/talks/4th-chains-workshop/slides.pdf)                                                    |
-|       | * Tina Heidinger (Github), Fredrik Skogman (GitHub), Github Attestations            |
+|       | * Tina Heidinger (Github), Fredrik Skogman (GitHub), [Github Attestations](https://docs.github.com/actions/security-guides/using-artifact-attestations-to-establish-provenance-for-builds)            |
 |       | * Frank Reyes, Fixing Breaking Dependency Updates Using LLMs                        |
 | 1230 | Lunch at Syster-o-bror                                                                      |
 | 1400   | Keynote: Henrik Plate (Endor Labs)                                                          |