Composting

Composting is aerobic stabilisation of organic residues: garden waste, food waste, manures, and some processing solids. It is not anaerobic digestion. It does not produce a fuel gas. It produces a soil amendment whose value depends on maturity, contaminants, and the market for the product.
BioJejak can trace a compost batch the same way it traces a residue load. The process design, the odour and leachate controls, and the product specification are engineering work, listed under professional services, not a claim that a particular pile has been certified.
See biofertiliser and biochar.