Script configures a Substrate client to submit a pallet extrinsic with random entropy

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• C·90a561ce1d · This script configures a client to submit a Substrate blockchain transaction via the _STD_.chains.substrate interface. It generates a secure random hex string as entropy and attempts to fulfill a specific pallet extrinsic identified by callIndex '0x4100'. The code requires manual configuration of the substrate node URL and the correct call index for the 'fulfill' extrinsic. Upon execution, it logs success or failure messages to the console, passing the operation hash or error details. No external services are invoked beyond the configured node endpoint.