ottobot-ai

ottobot-ai/cardano-scala-lab

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

40 good first / help-wanted issues · Scala · last activity Oct 11, 2026

0 stars 0 forks 0 watchers Scala Apache License 2.0
blockchain cardano cats-effect ouroboros scala scala3 tagless-final
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40 Open Issues Need Help Last updated: Oct 11, 2026

Open Issues Need Help

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[D5] Record network identity in the DB and refuse a mismatch 13 days ago
help wanted good first issue area:scale priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[D4] Persist volatile blocks and take a final snapshot on shutdown 13 days ago
help wanted area:scale priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[J1] Read Haskell config.json and topology.json; verify all genesis hashes 13 days ago
help wanted good first issue area:ops priority:P2
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[F2] LocalTxMonitor and local ChainSync 13 days ago
help wanted area:node-to-client priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[G2] Connection manager and inbound governor; run clients on inbound duplex 13 days ago
help wanted area:networking priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[G6] Header-first validation before block fetch 13 days ago
help wanted area:networking priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[D3] Investigate ChainSync pipelining depth (256 times out) 13 days ago
help wanted area:scale priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[H6] Slot clock sometimes 1.0 s behind the network (missed leader slots) 13 days ago
help wanted area:block-production priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[M10] Flaky FollowerSuite: "two peers: the chain of the longer one is followed, whichever arrives first" 13 days ago
help wanted area:hygiene priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[K6] Memory profile of RSS growth to 5.66 GB; bounded configuration 13 days ago
help wanted area:verification priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[K3] Fuzzing: CBOR decoders, tx/block decoding, mini-protocol codecs 13 days ago
help wanted area:verification priority:P2
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[I1] Run the upstream Plutus conformance suite against ScriptEvaluator 13 days ago
help wanted area:plutus priority:P2
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[H1] Public pool demo: Scala-run pool on Preview 13 days ago
help wanted area:block-production priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[N3] Leios: follow the public Leios testnet (decode, validate headers, report gaps) 13 days ago
help wanted priority:P2 area:leios
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[N2] Leios: BLS12-381 key registration, voting and certificate verification (pure, tested) 13 days ago
help wanted priority:P2 area:leios
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[N1] Ouroboros Leios: study CIP-164 and the formal specification; design note 13 days ago
help wanted priority:P1 area:leios
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[M7] Decide final project name; fix package root and sbt organisation 16 days ago
help wanted area:hygiene priority:P2
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[M4] Move test-only code out of main; tools under a tools package 16 days ago
help wanted good first issue area:hygiene priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[M9] READMEs for fixtures/{network,praos,sum6,vrf}; Koios attribution for fixtures/preview 16 days ago
help wanted good first issue area:hygiene priority:P2
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[M3] Hide global caches behind algebras 16 days ago
help wanted area:hygiene priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[H5] Forging-loop hardening: timing, missed-slot metric, slot-battle stats 16 days ago
help wanted good first issue area:block-production priority:P2
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[F3] Encode ApplyTxErr as ledger predicate-failure CBOR 16 days ago
help wanted area:node-to-client priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[F1] LocalStateQuery across the full query surface 16 days ago
help wanted area:node-to-client priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[C3] Read Byron epoch length from genesis everywhere 16 days ago
help wanted good first issue area:byron priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[C2] Byron consensus (PBFT): schedule, delegation certificates, body proofs 16 days ago
help wanted area:byron priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[C1] Byron ledger: UTxO and transactions, AVVM and non-AVVM genesis 16 days ago
help wanted area:byron priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[B13] Enforce header protocol-version checks and exact hard-fork timing 16 days ago
help wanted area:unconfirmed-rule priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[B11] Report Scalus deviations upstream (Ed25519 costing, V3 NewConstitution context) 16 days ago
help wanted good first issue area:unconfirmed-rule priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[B10] Check semantics-variant C costing of modInteger/remainderInteger 16 days ago
help wanted good first issue area:unconfirmed-rule priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[B9] Enforce Plutus builtin availability per language and protocol version 16 days ago
help wanted area:unconfirmed-rule priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[B8] Confirm pre-Babbage reward prefilter timing 16 days ago
help wanted good first issue area:unconfirmed-rule priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[B7] Confirm pre-Allegra rewards, MIR timing and Shelley-Mary min-UTxO 16 days ago
help wanted area:unconfirmed-rule priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[B6] Confirm empty-redeemers integrity hash (0x80 vs 0xa0) on chain 16 days ago
help wanted good first issue area:unconfirmed-rule priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[B5] Protocol-11 rules: exercise disjoint reference inputs and unelected-committee votes; enforce VRF key-hash uniqueness 16 days ago
help wanted area:unconfirmed-rule priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[B4] Verify treasury withdrawals to script accounts and script DReps 16 days ago
help wanted area:unconfirmed-rule priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[B3] Verify committee rules: minSize, expiry, term limits 16 days ago
help wanted area:unconfirmed-rule priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[B2] Exercise SPO default votes after the bootstrap phase 16 days ago
help wanted area:unconfirmed-rule priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[B1] Confirm Conway VRF tie-break restriction against ouroboros-consensus 16 days ago
help wanted good first issue area:unconfirmed-rule priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[A8] CI: secret scanning (gitleaks) and dependency review 16 days ago
help wanted good first issue area:publication priority:P1
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final
[A5] Legal and provenance review: licences, fixtures, trademark wording 16 days ago
help wanted area:publication priority:P0
ottobot-ai/cardano-scala-lab
0

Unofficial Cardano node in Scala 3 (tagless-final cats-effect, cats-mtl, cats-laws). Validates Shelley-to-Conway ledgers incl. Plutus V1-V3 and governance (Byron: headers only), syncs Preview from genesis, relays and forges blocks; checked against the Haskell cardano-node. Research software: not audited, not for mainnet funds.

Scala
#blockchain#cardano#cats-effect#ouroboros#scala#scala3#tagless-final