Right
戋 supplies the sound (jiān → qián, a regular palatal alternation) and a faint semantic flavour:
戋 means 'small, trifling' — a single coin is a small piece of metal. Phonetic family:
浅 (shallow),
贱 (cheap),
残 (incomplete) — all on
戋, all carrying a 'small/diminished' nuance.