Nick Szabo  🔑

Such confidence in Bitcoin is splendid, but a 94,500 BTC tx tempts fate. If recipient can make that much from reversing the tx, they can afford to run a 51% attack for more than 40 days. Big if & very visible, but security here depends more on trust & less on the protocol itself.https://twitter.com/whale_alert/status/1169815776733220866 …

If this is a tx internal to an organization, while that doesn't make it risk free (indeed just trusting employees with custody can be risky), their key management & other internal controls, not raw difficulty of reversing BTC tx, is their main protection for such a large amount.