Here are my key takeaways:
1. Permissioned blockchain networks are ready to be deployed but a solution for governance is required. I.e. a neutral organisation that decides who is admitted to the 'circle of trust'. Governance is likely to become a differentiating factor between the different types of permissioned blockchains existing today, e.g Community-centric blockchains focusing on ports, carriers, forwarders, terminals etc.. versus Ecosystem-centric blockchains run by specific companies capitalizing on their strong market positions.
2. Success of blockchain in Supply Chain is about gathering companies into a “coalition of the willing” that want to collaborate at arms-length
3. Interoperability will become more and more important to transact between the multiple permissioned blockchains that arise.