Clarity 6 Preview

[hugo-stacks]

As of Clarinet v3.18.1, you can preview Clarity 6.

What's included

Two new functions are available in the preview:

;; Verifies a Bitcoin-style merkle inclusion proof using double-SHA-256 hashing
;; with the "duplicate the last node on odd-sized rows" rule.
(verify-merkle-proof leaf-hash root-hash tx-index tx-count sibling-hashes)

;; Parses a serialized Bitcoin transaction (tx-bytes, with or without SegWit witness data)
;; and returns the output at the given vout index, plus the canonical (non-witness) txid of the transaction.
(get-bitcoin-tx-output? tx-bytes vout)

More functions are expected before Clarity 6 is finalized. Behavior may change.

How to test

By default, Clarinet targets the current mainnet epoch (3.4) and latest Clarity version (5). To opt in to Clarity 6, update your contract entry in Clarinet.toml:

​toml [contracts.counter] path = 'contracts/counter.clar' clarity_version = 6 epoch = "4.0" ​

Make sure you're on the latest releases:

• CLI: clarinet@3.18.1
• SDK: @stacks/clarinet-sdk@3.18.1
• VS Code extension: "Clarity - Stacks Labs" v3.18.1 (you may need to install this exact version manually)