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· 3 min read
Alexey Kuleshevich

High level summary​

Last few weeks were spent mostly on implementing various fixes, writing tests and improving capabilities of our testing frameworks. Important bug fixes are:

  • Retention of Anchor for proposal procedures in the ledger state in order for users to be able to query the node for those anchors
  • JSON serialization of rational numbers in protocol parameters and governance procedures are encoded without loss of precision

Feature wise, we've added a new protocol parameter that controls the contribution of reference scripts sizes in the transaction fee calculation formula.

Major achievement that is worth announcing is a Haskell package named cuddle that we developed over the last few months. Soon we will be transitioning to specifying CDDL in Haskell for all eras using that package. It will be used to compile the CDDL specification that developers in the community rely on so much. There are enormous benefits in using this tool, when compared to writing CDDL specification manually. Namely it allows us to reduce duplication and reuse common and unchanged specification from previous eras. It also improves safety and correctness of our specification and decoders, because it ensures that the specification is well typed and it uses QuickCheck to generate random data for validating that our decoders are implemented according to the spec.

Low level summary​

Conway​

  • pull-4031 - Further proposals improvements. Take 2
  • pull-3996 - Index aware PlutusPurpose
  • pull-3983 - Include reference scripts size in min fee calculation
  • pull-4040 - Redeemers serialization fixes
  • pull-4033 - Make Conway-specific queries only available in Conway
  • pull-4028 - Embed ProposalProcedure in GovActionState
  • pull-4056 - Reduce duplication in Conway UTXOW rule
  • pull-4055 - Update MinFeeRefScriptCoinsPerByte.
  • pull-4053 - Rename committeeQuorum to committeeThreshold
  • pull-4058 - Fix ToJSON instance of BoundedRatio to avoid precision loss
  • pull-4070 - Rename AsIndex to AsIx
  • pull-4065 - Remove ConwayPool rule definition

Improvements​

  • pull-4037 - Add capability to hash Plutus scripts directly
  • pull-4030 - Report Plutus ScriptHash upon execution failure

Testing​

  • pull-3895 - Constrained v2
  • pull-3981 - Test proposals rewrite
  • pull-4051 - Full support of random and quickcheck-transformers in impTest
  • pull-4050 - Fixed the "All Tx are valid on traces of length 150" intermittent bug
  • pull-4049 - Support for Plutus scripts in ImpTest
  • pull-4075 - Discontinue the mingw target in the nix build
  • pull-4072 - Fix ouroborus-consensus serialization roundtrip test
  • pull-4080 - Test that a resigned CC cannot be reelected without removal
  • pull-4083 - Fix flakyness at the cost of turning test on during development
  • pull-4084 - Fix intermittent test failures in leader-proportion test

Specification​

  • pull-4015 - Shelley ledger spec: amend erratum on nonce stabilization window
  • pull-4064 - Fix wrong prose for new epoch environment
  • pull-4081 - Fix MIR rule using wrong values for treasury and reserves

Releasing​

· 2 min read
Alexey Kuleshevich

High level summary​

One very important Conway feature that became available since last report is the ability for Stake Pool Operators to vote on some of the security relevant protocol parameter updates. We organized proposal hierarchy into a cohesive implementation, which together with good tests gives us confidence in its correctness.

We also fixed a few important bugs:

  • Preventing Constitutional Committee Members from voting on governance actions that they should not be allowed to vote on.
  • Prevent deposits from appearing in orphaned reward accounts after the staking credential has been unregistered, but before the proposal procedure deposit has been returned.
  • Ensure Sets are encoded in CBOR with tag 258 by default

Further improvements in testing tools and addition of more tests.

Low level summary​

Conway​

  • pull-3982 - Added SPO voting thresholds for security relevant parameters
  • pull-3978 - Proposals pruning rewrite
  • pull-4003 - Prefix Set encoding with tag 258
  • pull-3999 - Add PParamUpdates to the plutus context, by transforming them to Plutus Data
  • pull-4008 - Fixed a bug in GOV rule
  • pull-4013 - Remove EnactState from ConwayGovState
  • pull-4025 - Further improvements to Proposals
  • pull-4021 - Move unclaimed rewards from proposals to treasury

Testing​

  • pull-3997 - Added DRep delegation injections to Conway
  • pull-4023 - Add a function registerInState to EraTransition
  • pull-4005 - Fixes in Shelley Imp framework and other small things
  • pull-4004 - Verify that enacted gov action is removed
  • pull-4016 - Fix Arbitrary instance and invariant checking for Proposals

Improvements​

Releasing​

· One min read
Alexey Kuleshevich

High level summary​

Last week's achievement was that we finished PlutusV3 integration, which a massive piece of work.

Low level summary​

Conway​

Testing​

  • pull-3989 - Fix too many discards.
  • pull-3986 - Remove libs/cardano-ledger-pretty
  • pull-3991 - Imp native script support
  • pull-3993 - Change Test.Cardano.Ledger.Generic.Proof so that there is no more Crypto Evidence.

Releasing​

  • pull-3988 - Bump jinja2 from 3.1.2 to 3.1.3 in /doc

· 4 min read
Alexey Kuleshevich

High level summary​

Major Conway related development was the refactoring of how we distinguish Plutus language versions in every era, thus drasticly improving the type safety and getting us much closer to PlutusV3 integration.

There has also been many bug fixes and improvements since the last update. Some important bug fixes are:

  • missing "protocolVersion" field in JSON instance for Babbage and Conway protocol parameters
  • requiring witnesses for DRep registration
  • new committee governance action ratification was implemented incorrectly
  • guard against invalid protocol versions in hard fork initiation proposals
  • failures during updates of Plutus CostModels were not retained
  • fixed the types for some protocol parameters in order to prevent values that are too large
  • serialization and CDDL fixes

A few useful features have been also implemented, like new ledger events, doubling the limit for Url length, consensus query, JSON instances and so on. It was also required for testing to implement a reliable transaction fee estimation function, which is now available not only for testing, but also for cardano-cli.

Low level summary​

Conway​

  • pull-3915 - Utilize Inject type class for Val's inject
  • pull-3899 - Bring Plutus language version to the type level
  • pull-3917 - Ensure DRepRegistration certificate requires a witness
  • pull-3921 - Fix committee validation in Ratify
  • pull-3935 - Fixed a bug in Conway.Rules.Gov
  • pull-3956 - Allow 128 byte Url and DnsNames for decoder version atleast 9.
  • pull-3954 - Fix how we update CostModels
  • pull-3947 - Change the type of some pparam fields to align with how they are represented in Consensus
  • pull-3951 - Conway genesis DRep injection
  • pull-3961 - Switch ContextError to an injective type family from a data family
  • pull-3963 - Abstract getWitsVKeyNeeded
  • pull-3933 - Improve cbor serialization of TxWits in Conway
  • pull-3971 - ToJson instances for context error
  • pull-3977 - Added GetAccountStateQuery
  • pull-3975 - Add policy hash protection to TreasuryWithdrawals and ParameterChange

Testing​

  • pull-3892 - Translate DRep expiry test from ConwayFeatures to Imp GovSpec
  • pull-3913 - Add certs to conformance testing
  • pull-3911 - Add a Preds to generate valid GovActionStates.
  • pull-3929 - Improve comment on unit_interval in cddl
  • pull-3950 - Use discard to avoid bad traces for fixOutput
  • pull-3935 - Add some Imp tests for HardForkInitiation.
  • pull-3964 - Ignore thunks in utxosDeposited
  • pull-3962 - Add estimateMinFeeTx
  • pull-3976 - Introduce accurate min fee calculation function: calcMinFeeTx

Improvements​

  • pull-3930 - Change type of mintedTxBodyL to PolicyID
  • pull-3924 - Split type classes out of eras Core module
  • pull-3934 - Type safety bugfixes
  • pull-3949 - Add FromJSON BabbagePParams instance
  • pull-3953 - Babbage / Conway PParams JSON serialization
  • pull-3946 - Epoch interval instances
  • pull-3932 - Add ledger event TxUTxODiff
  • pull-3969 - Add missing stake key deposit in formal spec
  • pull-3973 - Move functionality of Cardano.Ledger.Pretty to Test.Cardano.Ledger.Generic.PrettyCore

Releasing​

· 2 min read
Alexey Kuleshevich

High level summary​

This period we reached a major milestone, namely we now have an initial version of Conway conformance testing working. We are now able to generate random valid data with the help of constraint based testing framework, apply that data to Conway Ledger rules and verify that the output matches to the one produced by the executable version of the Formal Ledger Specification, when it is applied to the same random data.

We also had a couple of Conway bugs fixed and a few new predicate check implemented. Get Constitutional Committee query is complete and tested. Various improvements to the testing tools. Addition of more test cases.

Low level summary​

Conway​

  • pull-3888 - Add checks for valid ProtVer when a proposal is a HardFork
  • pull-3902 - Fix pvCanFollow usage in Conway and improve clarity in Shelley
  • pull-3855 - Remove unreachable proposals
  • pull-3903 - Add lenient decoder for Addr
  • pull-3878 - Committee query - implement next epoch change

Testing​

  • pull-3893 - Move tree-diff dependency to tests together with all instances
  • pull-3896 - Fix Brute force failure
  • pull-3904 - New ListWhere Pred added to the Constrained Solver.
  • pull-3907 - cardano-ledger-conformance: Remove CHANGELOG.md from cabal file
  • pull-3883 - Committee QuerySpec Imp Test
  • pull-3909 - Make impAnn a bit more useful, by making the logs scoped by impAnn
  • pull-3908 - Use upstream testing instances for very basic types
  • pull-3912 - Removed call to tail, and the 'watchPulser' test
  • pull-3852 - Added constrained generators to conformance tests - Part 1

Improvements and releasing​