The Chain of Custody (COC) for forest certification refers to the entire chain of wood product processing companies, from log transportation, wood processing, circulation, papermaking, printing, and trade, to the final consumer. Perform authentication. After passing the Chain of Custody Certification (COC), consumers can be assured that the certified products come from well-managed forests and the logging is legal, thereby promoting the sustainable development of forests. This certification has been recognized globally, especially by buyers such as IKEA, B&Q, Home Depot, etc., stating that only sellers with forest certification can enter these stores.

According to a report by the Tropical Timber Organization (ITTO) on January 26, 2007, the British Centre for Wood Professional Technology (CPET) announced the acceptance of these certification systems after a rigorous evaluation of 5 different forest certification systems around the world.

The five forest certification systems are: Canadian Standards Association (CSA), Forest Stewardship Council (FSC), Forest Certification and Accreditation System (PEFC), Sustainable Forestry Initiative (SFI) and Malaysian Timber Certification Council (MTCC).

The decision convinced the government that the wood sources certified by these five forest certification systems are reliable. Barry Gardiner, a senior official in charge of biodiversity in the UK, said that continuing to accept these forest certification systems can ensure that wood is harvested from sustainably managed forests, and at the same time, it can also ensure that wood is harvested through legal means. . In 2008, these five certification systems will be evaluated again.