• An Intel or AMD x86 processor with two or more cores, at 1.6GHz or faster (2GHz or faster for a stake pool or relay)
• 24GB of RAM
• 150GB of free storage (250GB recommended for future growth)

• Linux 64-bit (Ubuntu 18.04 LTS, 20.04 LTS; Mint 19.3, 20; Debian 10.3)
• Windows 64-bit (8.1, 10, 11)
• MacOS 10.13, 10.14, 10.15, 11

• Docker image
• Static binaries:
  • linux
  • windows
  • Mac
• Configuration files

NOTE: Linux is showing a git revision of 0000000000000000000000000000000000000000 in --version because of a corruption issue in set-git-rev that only affects static musl built binaries. This is expected, and if it concerns you, please build from source.

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• The transactions in the mempool are now guaranteed to be processed irrespective of their sizes. This change also caused tryAddTxs to be removed in favour of a new addTx function.

• The provenance for the reward calculation has been removed. The type signature to the API function getRewardProvenance has not changed, it just returns an empty provenance value.
• We have created a Ledger API, with the aim of providing a user-friendly interface to the ledger libraries. See here.
• The initial funds and staking in the Shelley genesis type (used only for testing) now use ListMap instead of Map.
• There is a new calculatePoolDistr' function which is similar to calculatePoolDistr but has a new filter argument to only include the stake pool ids (stake pool key hashes) that are needed.
• The ledger events are not guaranteed to appear in any given order within a block. For this reason, motivated by the use case in db-sync, the TotalDeposits event now includes a transaction ID and emits the change in deposits instead of the value.
• We changed the way deposits are tracked. See here for the details.
• We changed the API function Cardano.Ledger.Shelley.API.Wallet(evaluateTransactionBalance) to take DPState as input. This can no longer be computed without the DPState
• Some noticeable changes have been made which will only become apparent starting at major protocol version 9:
  • There is a new ledger era, namely conway.
  • We now have the ability to more easily change serializations when the major protocol version changes. Though this change is not immediately visible to the node, it enables visible changes in the future. See CIP-80 For the deprecation cycle.
  • Pointer addresses will no longer accrue rewards starting with version 9.
  • We fixed the incorrect conversion of the validity interval's upper bound in transVITime.
  • Starting in version 9, duplicate keys in CBOR maps and sets are no longer allowed.
  • Starting in version 9, CostModels can now be deserialized from any map of Word8 values to lists of integers. Only valid cost models are actually converted to evaluation contexts that can be used. Errors and unrecognized language versions are stored in the CostModel type so that:
    • They can accept cost models that they do not yet understand.
    • Upon deserializing after a software update, new cost models are available from the prior serialization.

• Fixed interoperability bug in the legacy (non-p2p) networking stack exposed by p2p nodes (input-output-hk/ouroboros-network#4467).
• Fixed an issue with local root peers when using more than one DNS name (input-output-hk/ouroboros-network#4491).
• Added experimental peer sharing feature (it is unsafe until ouroboros-genesis is implemented) .

• cardano-cli provides ping command, which previous was available as a standalone cardano-ping executable.
• Rename TestEnableDevelopmentHardForkEras to ExperimentalHardForksEnabled and TestEnableDevelopmentNetworkProtocols to ExperimentalProtocolsEnabled
• Auto-balance multi asset transactions
• Default to the ledger's CDDL format for transaction body creation by removing flags --cddl-format and --cli-format from build and build-raw
• Update create-staked with the ability to specify relays for all created stake pools

• Append, not prepend change output when balancing a transaction
• Preserve ScriptData bytes with HashableScriptData
• Remove distinction between multisig and timelock scripts

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