Cosmos SDK

The language, concurrency, and IBC's place in the ecosystem.

• BAC-L1-COSMOS-101Beginner

  Go I — types, interfaces, errors

  The language most modern blockchain infrastructure is written in, approached through what sets it apart: enforced simplicity and errors as values.

  Level

  L1

  Duration

  4 h

  Prerequisites

  1 prerequisites

• BAC-L1-COSMOS-102Intermediate

  Go II — concurrency, contexts, testing

  A node is a concurrent program. Goroutines, channels and cancellation contexts: the toolkit that keeps that concurrency from becoming a trap.

  Level

  L1

  Duration

  4 h

  Prerequisites

  1 prerequisites

• BAC-L1-COSMOS-103Beginner

  Cosmos ecosystem architecture

  Sovereign chains linked by a common protocol: what that model enables, and the responsibility it transfers to each team.

  Level

  L1

  Duration

  3 h

  Prerequisites

  1 prerequisites

The ABCI boundary, then a sovereign four-validator network.

• BAC-L2-COSMOS-104Intermediate

  CometBFT and the ABCI interface

  The most important boundary in the Cosmos stack: consensus orders transactions, the application decides their effect. The two know each other only through an interface.

  Level

  L2

  Duration

  4 h

  Prerequisites

  2 prerequisites

• BAC-L2-COSMOS-105Intermediate

  Your first sovereign chain

  Scaffold, configure and launch a multi-validator chain: genesis, keys, tokens, parameters. Where a template becomes a living network.

  Level

  L2

  Duration

  4 h

  Prerequisites

  2 prerequisites

State, messages, queries and automatic block processing.

• BAC-L2-COSMOS-106Intermediate

  Anatomy of a Cosmos module

  The module as the unit of application logic: keeper, state, messages, queries, lifecycle. The grammar for the rest of the track.

  Level

  L2

  Duration

  4 h

  Prerequisites

  1 prerequisites

• BAC-L2-COSMOS-107Advanced

  Designing state and storage

  Designing a key space that stays queryable at millions of entries, and where every byte is justified.

  Level

  L2

  Duration

  4 h

  Prerequisites

  1 prerequisites

• BAC-L2-COSMOS-108Advanced

  Messages, handlers and validation

  The entry point for every state change, and therefore the chain's first line of defence.

  Level

  L2

  Duration

  4 h

  Prerequisites

  1 prerequisites

• BAC-L2-COSMOS-109Intermediate

  Queries, gRPC and indexing

  Exposing state to the outside: what should be directly queryable, and what belongs in an off-chain indexer.

  Level

  L2

  Duration

  3 h

  Prerequisites

  1 prerequisites

• BAC-L2-COSMOS-110Advanced

  Block lifecycle and automatic processing

  What the chain executes on its own each block — expiries, distributions, cleanups — and the time budget that consumes.

  Level

  L2

  Duration

  3 h

  Prerequisites

  1 prerequisites

Accounts, tokens, staking, slashing, governance and coordinated upgrades.

• BAC-L2-COSMOS-111Intermediate

  Accounts, signatures and fees

  How a transaction is authenticated and priced before it ever reaches business logic.

  Level

  L2

  Duration

  3 h

  Prerequisites

  1 prerequisites

• BAC-L2-COSMOS-112Intermediate

  Tokens, issuance and the monetary model

  Defining an application chain's unit of account: denominations, precision, issuance, and the mistakes you cannot walk back.

  Level

  L2

  Duration

  3 h

  Prerequisites

  1 prerequisites

• BAC-L2-COSMOS-113Advanced

  Staking and economic security

  What actually protects a sovereign chain: the value its validators lock up, and the cost of corrupting a third of it.

  Level

  L2

  Duration

  4 h

  Prerequisites

  1 prerequisites

• BAC-L2-COSMOS-114Advanced

  Slashing, downtime and equivocation

  The negative incentives that make misbehaviour expensive — and that also punish plain operational negligence, without distinction.

  Level

  L2

  Duration

  3 h

  Prerequisites

  1 prerequisites

• BAC-L2-COSMOS-115Intermediate

  On-chain governance

  Deciding parameters, treasury and upgrades collectively, with thresholds that determine who actually governs.

  Level

  L2

  Duration

  3 h

  Prerequisites

  1 prerequisites

• BAC-L2-COSMOS-116Expert

  Coordinated upgrades and migrations

  A sovereign chain upgrades at an agreed block height: a validator running the wrong version forks alone.

  Level

  L2

  Duration

  4 h

  Prerequisites

  1 prerequisites

Tests, simulation, and controlled opening to third-party code.

• BAC-L2-COSMOS-117Advanced

  Testing a Cosmos application

  From keeper unit tests to integration tests on a simulated network: the only thing separating a shippable chain from a prototype.

  Level

  L2

  Duration

  4 h

  Prerequisites

  1 prerequisites

• BAC-L2-COSMOS-118Advanced

  CosmWasm I — contracts on a sovereign chain

  Opening your chain to third-party WebAssembly code: execution model, entry points, state, and the question of who may deploy.

  Level

  L2

  Duration

  4 h

  Prerequisites

  2 prerequisites

• BAC-L2-COSMOS-119Advanced

  CosmWasm II — integrating with native modules

  Making contracts and native modules talk to each other, and deciding what must stay in the protocol rather than move into a contract.

  Level

  L2

  Duration

  4 h

  Prerequisites

  1 prerequisites

Clients, channels, transfers, relayers, interchain accounts and shared security.

• BAC-L3-COSMOS-120Advanced

  IBC I — clients, connections, channels

  The most widely deployed interoperability protocol, broken into its three layers. Each answers a distinct trust question.

  Level

  L3

  Duration

  4 h

  Prerequisites

  1 prerequisites

• BAC-L3-COSMOS-121Advanced

  IBC II — token transfer between chains

  IBC's founding use case, and its main subtlety: the token you receive is not the original token, and its worth depends on the path it took.

  Level

  L3

  Duration

  4 h

  Prerequisites

  1 prerequisites

• BAC-L3-COSMOS-122Expert

  Operating an IBC relayer

  A relayer carries packets without being able to forge them — but if it stops, funds get stuck. Critical infrastructure with no privilege.

  Level

  L3

  Duration

  4 h

  Prerequisites

  2 prerequisites

• BAC-L3-COSMOS-123Expert

  Interchain Accounts and Queries

  Beyond value transfer: controlling an account on a remote chain, and reading its state verifiably.

  Level

  L3

  Duration

  4 h

  Prerequisites

  1 prerequisites

• BAC-L3-COSMOS-124Expert

  Shared security between chains

  Borrowing an established chain's validator set instead of building your own: what that choice changes about the sovereignty model.

  Level

  L3

  Duration

  4 h

  Prerequisites

  2 prerequisites

• BAC-L3-COSMOS-125Expert

  Cosmos capstone: a sovereign chain connected over IBC

  Deliver a complete sovereign chain answering a real use case, and connect it to a second chain over IBC, relayer included.

  Level

  L3

  Duration

  6 h

  Prerequisites

  2 prerequisites