Digital certificates and achievement NFTs act as symbolic rewards and durable memory rather than financial assets. They are designed to recognise contribution, learning, creativity, and stewardship within the Intergalactic Timebank and Open Footprint ecosystem. These certificates function as social signals, narrative artefacts, and governance inputs, not as tradeable commodities. Each certificate NFT is issued as a signed attestation tied to a towel identity. It may represent milestones such as completing a learning path, contributing verified service hours, improving a local footprint metric, facilitating a micro-assembly of 42 beings, or resolving a difficult dispute. Most certificates are soulbound, meaning they cannot be transferred or sold, ensuring that achievements remain linked to lived experience rather than market exchange. Certificates influence the system indirectly. Holding certain achievements can increase credit limits, unlock roles such as mediator or auditor, or grant voting or co-signing rights in batch clearing and governance. In gameplay terms, they act as “badges with consequences”, shaping what a Hitchhiker can do rather than what they can extract. This keeps incentives aligned with participation, trust, and care rather than accumulation. From a technical perspective, certificates are lightweight NFTs that reference evidence stored off-chain and are optionally included in batch-cleared manifests. Their existence can be proven through the same inclusion and signature mechanisms used for Voz transactions. Because they are not currency, certificates do not participate in clearing or anchoring for value transfer, but they may be referenced by policy rules that govern credit, access, or responsibility. In story terms, these certificates are the medals, travel stamps, and footnotes of the Hitchhiker universe. They document journeys taken, mistakes survived, and care shown. In practical terms, they provide a playful and human-centred way to motivate learning and contribution while reinforcing the non-market, mutual-credit nature of the system.