By Gertrude Chavez-Dreyfuss and Amanda Cooper NEW YORK/LONDON, Feb 6 (Reuters) - Bitcoin climbed back above $70,000 on Friday, after sinking to a 16‑month low earlier, lifted by a sharp rebound in technology shares and precious metals following a global rout that had hammered a broad swathe of risk assets. The world's ​largest cryptocurrency was last up more than 11$70,231, rising as high as $71,464.96 and recouping losses that pushed it to$60,017.60, the lowest level since October ‌24, earlier o ...