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WASM Binary Size

This document records the optimized WASM build command for ILN smart contracts and the current size guidance for the generated binaries.

Optimized build command

cargo build --release --target wasm32-unknown-unknown

The repository also exposes a Makefile shortcut:

make soroban-optimize

Current WASM size guidance

  • Optimized Soroban contract binaries are expected to be small, typically in the range of 10 KB to 80 KB per contract when built with the release profile.
  • Actual size should be verified after building with the command above.

Verification

After building, check the size of the generated WASM file:

wc -c target/wasm32-unknown-unknown/release/<contract>.wasm

or

stat -c%s target/wasm32-unknown-unknown/release/<contract>.wasm