Tezos Unleashes Seoul Upgrade: Fortified Security and Turbocharged Efficiency

Tezos just leveled up—big time. The blockchain's latest Seoul upgrade slashes vulnerabilities while cranking transaction throughput to new heights.

Fortress Mode: Activated

Enhanced cryptographic protocols now armor the network against emerging threats. Validators operate with reinforced consensus mechanisms that make previous security look downright porous.

Efficiency Overdrive

Transaction finality accelerates by 40% while gas consumption drops precipitously. The upgrade bypasses previous bottlenecks that had developers grinding their teeth—now they're racing to deploy.

Because in crypto, you either evolve or get rekt by the next anonymous teenager in a basement. Tezos clearly chose evolution.

The Tezos blockchain has successfully activated its 19th protocol upgrade, known as Seoul, as of September 19, 2025. This significant update, developed by Nomadic Labs, Trilitech, and Functori, went live on Mainnet at block #10,279,489, bringing a suite of enhancements aimed at improving security and efficiency.

Key Features of the Seoul Upgrade

Among the most noteworthy features of the Seoul upgrade are the introduction of native multisig accounts, aggregated attestations, and open unstake finalization. These improvements are expected to enhance the blockchain's performance and user experience significantly.

Native multisig accounts provide greater security and flexibility for institutional users and collectively managed accounts. This feature allows multiple private keys to manage an account, enhancing security and usability. Notably, these accounts are available on tz4 accounts, leveraging the BLS signature scheme.

Aggregated attestations promise substantial network efficiency gains by replacing multiple attestation signatures with a single signature, significantly reducing bandwidth and storage needs. This development facilitates lower latency and faster finality on LAYER 1.

Technical Advancements

The Seoul protocol also includes advancements in staking processes. The open unstake finalization feature allows unstake operations to be automatically finalized by any account, streamlining the process and enhancing user convenience. This change is supported by a bot developed by Trilitech, which operates on Mainnet as a community infrastructure.

For bakers, the adoption of tz4 consensus keys is crucial. This transition is facilitated by the BLS signature scheme, which requires bakers to use tz4 keys for signing consensus operations. To aid this transition, Nomadic Labs has introduced the Tezos RPI BLS Signer, a hardware solution designed for secure signing on Tezos.

Despite the advancements, current Ledger hardware devices are not compatible with tz4 accounts due to computational demands, and some cloud KSM solutions do not support BLS signatures. However, the Tezos RPI BLS Signer provides a viable alternative, emphasizing security and efficiency.

Community and Future Prospects

The Seoul upgrade marks a significant step in Tezos' ongoing evolution, aligning with the Tezos X roadmap and reinforcing its position at the forefront of blockchain technology. The upgrade reflects collaborative efforts within the Tezos ecosystem, underscoring the community's role in driving technological advancements.

For further details on the Seoul upgrade, including technical specifications, Tezos enthusiasts and developers can refer to the official Tezos announcement.

• tezos
• blockchain upgrade
• seoul protocol