Transparency: each node on the network shares the same copy of the data record - without a consensus of all members it is not possible to change data!
Practically impossible to alter records, which are available to everyone
Security: Before transaction is recorded, it has to bee agreed upon, then it is being encrypted, linked to previous transaction and then distributed over whole network of computers, where all nodes have exact same copy of the data
Traceability: there is an audit trail on the blockchain that allows you to trace where individual components of the supply chain are coming from
Increased efficiency and speed: no need for third parties for verification which is time consuming and prone for error, no need for documentation, you rely on an algorithm that if extremely fast and records everything electronically
REduced cost: again, lack of need for the third party decreases the cost, nom need for documentation