The databaser in me wonders about the applicability of a two-phase commit protocol. Suppose PG/YC (s/PG/{FW or BF or ...}) acted in the role of a transaction c

The databaser in me wonders about the applicability of a two-phase commit protocol. Suppose PG/YC (s/PG/{FW or BF or ...}) acted in the role of a transaction coordinator. Instead of sending confirmation messages directly to each other, the parties would send their confirmations to the coordinator. Like an escrow agent, the coordinator would wait until all parties had confirmed and then send agreement notifications to all. This might allow investors to commit with contingencies, such as requiring other investors or a minimum investment greater than their own investment.