Adapt height of hard fork
Adapt height of hard fork

Expected one block every 5 minutes.

Aiming at consensus protocol switch in night between Thu 26th Apr and
Fri 27th Apr.

Seen testnet chain height 7258 in Thu 26th Apr mid-morning (10am
BST). Target time of switch Fri 4am so 18 hours apart. 18 hours is is
216 blocks ((18 * 60) / 5 = 1080 / 5 = 216) i.e. approx. absolute
height (7258 + 216 = ) 7474. Pick 7450.

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