The unrelenting growth in blockchain functionality drives greater adoption and, therefore, ensures the security of transaction settlement. We show that the wider adoption carries its own risk for the blockchain. Specifically, when a large fraction of blockchain transactions involves non-native tokens, the cost of price discovery in the native cryptocurrency increases. This, in turn, leads to lower trade informedness and price efficiency. In a difference-in-differences setup, we find that a shock to non-native transactions typically leads to 1.25 bp of unrealized informed price movement and a 0.60% decrease in price efficiency in the underlying cryptocurrency. Our findings lend support to the theoretical literature arguing that multiple attack vectors on blockchain arise from native cryptocurrency mispricing.