Due to the recent system upgrade, a cryptocurrency exchange Huobi Pro have also updated the API signature scheme, and the new scheme will take effect at 14:00 on July 9 (GMT+8).
For the convenience of API users, the exchange will provide a transition period which is from 14:00 on July 9 to 00:00 on July 24 (GMT+8). During the transition period, Huobi Pro will support both the old and new signature verification methods. At the end of the transition, it will only support the new signature verification, so API users need to make code changes in a timely manner.