Spark’s SPK token jumped as much as 73% in 24 hours after Upbit announced a new listing for Korean traders.Spark said total staked SPK has surpassed 500 million tokens, signaling deepening holder commitment.F2Pool co-founder Wang Chun admitted he “regret[s]” selling 83.7 million SPK last year for about $1.4 million, stoking speculative interest.