Being charged more than expected for Random Number Generation using Provable

I have implemented provable going off the following example – https://github.com/provable-things/ethereum-examples/blob/master/solidity/random-datasource/randomExample.sol . Unfortunately I can’t understand why I am being charged .00434 eth per call (~.63$), from what I understand from the pricing it says random should be .05$ + .0$ for the Ledger proof type. Any ideas what I am doing wrong? (This is…

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Cannot boot Ubuntu after installing Windows 10 using GRUB (boot-rapair did not help)

I installed Xubuntu 18.04 and decided to install Windows 10 afterwards (because I needed some features of Windows). I tried to install GRUB from live CD after installing Windows using boot-repair, but this did not solve my problem. GRUB just doesn’t appear at the startup and Win 10 will be booted immediately. The pastebin can…

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