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Layer-2 firm Polygon Labs also participated in the investment round, a spokesperson for Espresso told CoinDesk over email. According to a screenshot tweeted by the Espresso team, other investors included the layer-2 developers StarkWare and Taiko. Offchain Labs, the main developer behind Arbitrum, the biggest layer-2 network, backed Espresso, according to a post on X by CEO Steven Goldfeder.