The 0.40 release of Hedera Services brings support for HIP-729 ~ "Contract Accounts Nonce Externalization". Smart contract developers using the Hedera public mirror node will now be able to track contract nonces as they would on e.g., Ethereum. Use cases might include troubleshooting failed contract calls or writing unit tests that validate transaction ordering based on CREATE1 addresses (once these are set by default in release 0.41+).