Weekly Engineering Update: - New Whitepaper: Review ongoing. - Consensus and stake delegation implementation strategy: working with the NodeviewHolder processing logic changes and the Sidechain History updates. - Mainchain updates required by the sidechain model: Continued developments required to allow backward transfers from sidechains to mainchain. First code review upcoming. Creating python tests for code and functions coverage. - Block Explorer update: Integrated the latest block explorer version with zend. - Sphere by Horizen: Prepared the build for main performance issue fix, includes a graphical UX component. Testing to follow.