This report documents ideas for how certifiers can leverage blockchain technology to reduce audit inefficiency, create a single source of truth for chain of custody (CoC) tracking and support sustainability data reporting. 
This guidance developed by ISEAL on Chain of Custody (CoC) System is a reference document for sustainability standards systems that complements ISEAL's Sustainability Claims Good Practice Guide.
Best known as the technology behind cryptocurrencies like Bitcoin, blockchain is set to revolutionise many areas of life and work over the coming years.