Zipper

Stellar

<h2 id="zipper-goes-live-on-stellar-mainnet">Zipper Goes Live on Stellar Mainnet</h2><p><a href="https://x.com/StellarOrg" rel="noopener noreferrer nofollow">@StellarOrg</a> has activated the Protocol 27 upgrade, codenamed Zipper, on the Stellar mainnet. <cite>The mainnet upgrade vote took place on July 8, 2026</cite>, completing a rollout that included testnet deployment on June 18 and a series of SDK, RPC, and core releases stretching back to early June.</p><p><cite>The upgrade centres on a single but consequential change: making authentication delegation a first-class feature on Stellar, meaning one account can officially authorise another to act on its behalf.</cite><cite>Before Zipper, delegation existed on Stellar only as an accidental side effect. Developers who tried to use it faced a tangle of manual steps, extra simulation passes, and bloated transaction sizes, so most teams avoided it entirely.</cite><cite>Zipper makes delegation a proper, first-class feature that is dramatically simpler to implement correctly.</cite></p><h2 id="what-changes-for-developers-and-users">What Changes for Developers and Users</h2><p><cite>Cheaper transactions and more flexible account designs, including social recovery, delegated signing keys, and modular multisig, become practical to build.</cite><cite>Transactions also become smaller and cheaper because all delegated signers bundle into a single authorisation entry instead of requiring separate ones.</cite></p><p>The upgrade also closes a security gap in the Soroban smart contract environment. <cite>Signature payloads now explicitly bind to the top-level account address, preventing cross-account replay attacks. CAP-0071-02 adds address-bound Soroban credentials (V2), closing a narrow replay vulnerability.</cite></p><p><cite>Soroban developers building smart accounts, including wallets, multisig schemes, and account abstraction, will see the most direct benefit.</cite><cite>Developers building applications where multiple accounts may share keys, or who want to adopt a more conservative security posture, should plan to migrate to SOROBAN_CREDENTIALS_ADDRESS_V2 after the Protocol 27 upgrade.</cite></p><p>Protocol 27 also lays the groundwork for what comes next. <cite>The Stellar Development Foundation has confirmed that Protocol 28 will bring contract-based authentication to classic Stellar accounts, and the delegation mechanism in Zipper is a direct prerequisite for that.</cite> For <a href="https://x.com/search?q=%24XLM&amp;src=cashtag_click" rel="noopener noreferrer nofollow">$XLM</a> and the broader Stellar ecosystem, Zipper is less a final destination and more the foundation for the next wave of smart account capabilities.</p><p><b>Sources</b><br><a href="https://stellar.org/blog/foundation-news/stellar-zipper-protocol-27-upgrade-guide" rel="noopener noreferrer nofollow">Stellar Development Foundation: Zipper Protocol 27 Upgrade Guide</a><br><a href="https://www.cryptowisser.com/news/zipper-protocol-27-is-now-live-on-stellar-mainnet" rel="noopener noreferrer nofollow">CryptoWisser: Zipper Protocol 27 Is Now Live on Stellar Mainnet</a></p>

Stellar Is More Powerful with its Latest Upgrade

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