Use ecrecover instead of tx.origin#206

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tedwu13 wants to merge 6 commits intoampleforth:masterfrom

tedwu13:tedwu-erecover

Commits on Feb 23, 2021

lint
Ted Wu
committed
use the ecdsa functions
Ted Wu
committed

Commits on Feb 24, 2021

fix compiler error
Ted Wu
committed
add using library
Ted Wu
committed

Commits on Feb 25, 2021

import ecdsa
Ted Wu
committed
Added openzeppelin contracts
Ted Wu
committed