Past Tezos Amendments
A list of past successful protocol upgrades and their features.
Of the two proposals, Athens A sought to increase the gas limit and reduce the roll size required to bake from 10,000 tez to 8,000 tez. Athens B sought to just increase the gas limit. Athens A was autonomously activated onto the protocol in May 2019.
Notable changes included a new consensus algorithm variant (Emmy+), addition of new Michelson features to aid smart contract developers, an account rehaul that enabled clearer distinction between tz and kt accounts, as well as refinements to the quorum formula and addition of a 5% proposed quorum threshold.
Notable changes included increasing the gas limit per block and operation by 30%, improving the accuracy of the formula used for calculating baking and endorsing rewards, as well as several minor improvements to Michelson.
Notable changes included improving the performance of the Michelson interpreter, improving gas costs by adjusting the gas model, reducing storage costs by 4x, and various other small fixes.
The Edo proposal was injected in November 2020 with contributions by Nomadic Labs, Metastate, and Gabriel Alfour.
Edo adds two major features for Tezos smart contracts
- Sapling and BLS12-381 to enable privacy-preserving smart contracts
- Tickets for native on-chain permissions and asset issuance
The Florence proposal was a joint effort from Nomadic Labs, Marigold, DaiLambda, and Tarides.
Florence's notable bug fixes and improvements are:
- Increasing maximum operation size
- Improved gas consumption for execution of more complex smart contracts
- Changing intercontract calls to a depth first ordering, as opposed to breadth first
- The elimination of the test chain activation
Baking Accounts were also included in the feature set, however, ongoing testing had uncovered some important and previously undocumented breaking changes in the Baking Account proposal. Baking Accounts should be postponed until a thorough audit of functionality is complete, or an alternative implementation produced. The version of Florence without Baking Accounts is considered a safer choice.
The Granada proposal injected in May of 2021 was a joint effort from Nomadic Labs, Marigold, TQ, Tarides and DaiLambda. Granada contains several major improvements to the protocol, as well as numerous bug fixes and minor improvements:
- Emmy*: will generally halve the time between blocks, from 60 seconds to 30 seconds, allows transactions to achieve significantly faster finality than under the previous consensus algorithm.
- Liquidity Baking: will incentivize large amounts of decentralized liquidity provision between tez and tzBTC by minting a small amount of tez every block and depositing it inside of a constant product market making smart-contract.
- Gas improvements: A number of substantial improvements to performance have been made, which in turn result in dramatic reductions in gas consumption. Improvements by a factor of 3 to 6 ( sometimes 8 ) have been improved.
Important: revision 011_PtHangzH of protocol Hangzhou contains a bug that is corrected in the latest version 011_PtHangz2
The Hangzhou proposal features several major improvements to the protocol, as well as numerous minor improvements. Below, we present some of the most interesting and important changes:
The code can be found in the src/proto_012_Psithaca directory of the
masterbranch of Tezos. Ithaca most notably implemented the Tenderbake upgrade amongst other improvements. The details of which can be found here:
The code can be found in the src/proto_013_PtJakart directory of the
masterbranch of Tezos. The Jakarta protocol proposal includes Transaction Optimistic Rollups, fixes for Sapling integration, a Liquidity Baking toggle as well as: