Tezos activated its Tallinn protocol upgrade on Mainnet on January 24, 2026, at 16:06:56 UTC, at block #11,640,289. The deployment marked the network’s 20th protocol upgrade since launch, all executed through Tezos’ on-chain governance process without requiring a hard fork or network downtime.
The Tallinn upgrade introduced three major technical changes to the Tezos layer-1 network: a reduction in block time to six seconds, a new attestation model that allows all bakers to attest to every block once adoption thresholds are met, and the Address Indexing Registry, which targets significant storage efficiency improvements for smart contract applications.
The protocol upgrade was developed by Nomadic Labs, Trilitech, and Functori, with testing and feedback contributions from bakers and ecosystem teams across the network.
Tallinn, the 20th Tezos protocol upgrade is live.
— Tezos (@tezos) January 24, 2026
⚡ 6s blocks → lower latency, 12s L1 finality
🛡️ Once ≥50% tz4: all bakers attest every block → stronger security, more predictable rewards
🗂️ Address Indexing Registry → up to 100x gains in storage efficiency pic.twitter.com/EDAbpD6mbh
Six-second block time shortens finality
Tallinn reduced Tezos layer-1 block time from eight seconds to six seconds. Under the new parameters, layer-1 finality, which requires two blocks, now occurs in approximately 12 seconds.
The shorter block time reduced latency across the base layer and improved transaction responsiveness for applications that rely directly on layer-1 settlement. The change also benefited Etherlink, Tezos’ layer-2 network, which secures data publication through inclusion in layer-1 blocks.
According to the Tezos announcement, the reduction preserved the network’s existing hardware requirements for validators. The protocol design maintained a low barrier to entry for baking while prioritizing decentralization and censorship resistance.
Attestation reform strengthens security model
Tallinn enabled a new consensus feature that allows all bakers to attest to every block, rather than a rotating subset. The feature will activate automatically once at least 50% of bakers adopt tz4 addresses for consensus operations.
The Tezos team explained the mechanism in a statement:
“This is achieved through the use of BLS cryptographic signatures, which aggregate hundreds of signatures into just one per block. By lightening the load on nodes, it also opens the door to further block time reductions.”
The adoption threshold is measured by the number of individual baker operations rather than total stake share. Once activated, the feature will remain enabled even if participation later falls below the threshold.
Tezos confirmed that bakers who continue to operate with tz1, tz2, or tz3 addresses will not lose the ability to bake. Only the consensus key requires a tz4 address, while manager keys and public addresses may remain unchanged.
The network also issued guidance on hardware compatibility. Current Ledger hardware signers cannot produce tz4 BLS signatures fast enough for Tezos consensus requirements. Supported alternatives include the Tezos RPi BLS Signer, TezSign, and Signatory.
Address Indexing Registry cuts storage overhead
Tallinn introduced the Address Indexing Registry, a change designed to reduce redundant address data within Michelson smart contract storage. The registry enables storage footprint reductions of up to 100x for applications that manage large address sets, such as enterprise ledgers and NFT platforms.
Tezos representatives stated that existing applications must update their contracts to benefit from the feature. The long-term impact includes slower growth in network-wide storage use and improved throughput capacity.
Spokespeople for Tezos said the address indexing mechanism improves storage efficiency by a factor of 100.
A milestone for forkless governance
The Tallinn upgrade reinforced Tezos’ governance model, which allows protocol changes to pass through proposal, testing, and activation phases entirely on-chain. Each upgrade occurred without network splits or operational disruptions.
Tezos framed the 20th upgrade as another incremental step toward faster execution, stronger security guarantees, and enterprise-ready infrastructure, while preserving decentralization principles.
The announcement credited bakers and ecosystem teams for extensive testing, review, and coordinated deployment efforts.
Broader context in blockchain scalability
The Tallinn upgrade arrived amid broader efforts across the blockchain sector to reduce settlement times and improve throughput.
Early blockchain networks such as Bitcoin and Ethereum processed roughly seven transactions per second and 15 to 30 transactions per second, respectively. Bitcoin produced blocks every 10 minutes on average, which limited base-layer commercial use. Ethereum relied on layer-2 networks and modular design to scale execution and data availability.
Tezos pursued performance gains directly at the protocol level while retaining a monolithic architecture and on-chain governance process. The Tallinn release placed Tezos among networks that continue to optimize base-layer performance rather than relying exclusively on external scaling layers.
Roman Zaika
Disclaimer: All materials on this site are for informational purposes only. None of the material should be interpreted as investment advice. Please note that despite the nature of much of the material created and hosted on this website, HODL FM is not a financial reference resource, and the opinions of authors and other contributors are their own and should not be taken as financial advice. If you require advice. HODL FM strongly recommends contacting a qualified industry professional.
