This document describes the in-built accounts system of OKC.

Pre-requisite Readings

OKC Accounts

OKC defines its own custom Account type that uses Ethereum’s ECDSA secp256k1 curve for keys. This satisfies the EIP84 for full BIP44 paths. The root HD path for OKC-based accounts is m/44'/60'/0'/0.

Addresses and Public Keys

There are 3 main types of Addresses/PubKeys available by default on OKC:

  • Addresses and Keys for accounts, which identify users (e.g. the sender of a message). They are derived using the eth_secp256k1 curve.
  • Addresses and Keys for validator operators, which identify the operators of validators. They are derived using the eth_secp256k1 curve.
  • Addresses and Keys for consensus nodes, which identify the validator nodes participating in consensus. They are derived using the ed25519 curve.
Address bech32 Prefix Pubkey bech32 Prefix Curve Address byte length Pubkey byte length
Accounts ex expub eth_secp256k1 20 33 (compressed)
Validator Operator exvaloper exvaloperpub eth_secp256k1 20 33 (compressed)
Consensus Nodes exvalcons exvalconspub ed25519 20 32

Address formats for clients

OKCAccounts can be represented in both Bech32 and hex format for Ethereum’s Web3 tooling compatibility.

The Bech32 format is the default format for Cosmos-SDK queries and transactions through CLI and REST clients. The hex format on the other hand, is the Ethereum common.Address representation of a Cosmos sdk.AccAddress.

  • Address (Bech32): ex1hcngft7gfkhn8z8fnlajzh7agyt0az0v6ztmme
  • Address (EIP55 Hex): 0xBE2684Afc84daf3388E99FFB215FdD4116FE89EC
  • Compressed Public Key (Bech32): expub17weu6qepqgantzvj79rywafrxmye524tpa8kp6akjct3nw7wel623lsnfwynqyfe75k

You can query an account address using the OKC CLI or REST clients:

# NOTE: the --output (-o) flag will define the output format in JSON or YAML (text)
exchaincli q auth account $(exchaincli keys show <MYKEY> -a) -o text
  address: ex1hcngft7gfkhn8z8fnlajzh7agyt0az0v6ztmme
  eth_address: 0xBE2684Afc84daf3388E99FFB215FdD4116FE89EC
  - denom: okt
    amount: "10000000"
  public_key: expub17weu6qepqgantzvj79rywafrxmye524tpa8kp6akjct3nw7wel623lsnfwynqyfe75k
  account_number: 0
  sequence: 1
  code_hash: c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470
# GET /auth/accounts/{address}
curl -X GET "<NODE_IP>/auth/accounts/ex1hcngft7gfkhn8z8fnlajzh7agyt0az0v6ztmme" -H "accept: application/json"

::: tip The Cosmos SDK Keyring output (i.e exchaincli keys) only supports addresses and public keys in Bech32 format. :::

To retrieve the Ethereum hex address using Web3, use the JSON-RPC oec_accounts endpoint:

# query against a local node
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_accounts","params":[],"id":1}' -H "Content-Type: application/json" http://localhost:26664