Here's a line from Coincheck's minute-by-minute volume (as reported by BitcoinCharts):
This is a small move in terms of price, but a fairly large trade for this particular exchange - about 7x the usual minute-by-minute volume.
This is followed a couple minutes later by high volume on Kraken (USD):
And then the other exchanges. Most small exchanges see big volume bumps at 04:32:00, but feedback into Coincheck seems to happen comparatively fast; it begins at 04:31:00 too.
Could arbitrage from this big Coincheck trade have been the event that kicked off today's green candle? Or am I reading too much into this, and the trade at 4:28 was just a coincidence?