As digital infrastructures become increasingly critical to society, concerns over their trustworthiness and reliability have gained attention among European policymakers. The concept of Responsible Internet emerges as the next pivotal phase in their evolution, underlining the necessity of transparency in networks granting both critical service providers and everyday users the ability to know where the data flows they inject into the network are routed and which chain of providers handles them. To achieve such a goal and contribute to dismantling the black box nature of networks, we explored In-band Network Telemetry, a framework for collecting fine-grained metadata about the network's state with low and fixed transmission overhead.