OUC On-Chain Data Retrieval Skill

This skill provides patterns for querying on-chain data from both EVM and ICP chains.

EVM Queries (via cast)

Query ERC-7546 Dictionary Implementation

bash

# Get implementation address for a selector
cast call $DICTIONARY_ADDR "getImplementation(bytes4)(address)" $SELECTOR --rpc-url $RPC_URL

# Get dictionary owner
cast call $DICTIONARY_ADDR "owner()(address)" --rpc-url $RPC_URL

# Read storage slot directly
cast storage $CONTRACT_ADDR $SLOT --rpc-url $RPC_URL

Query ERC-7546 Proxy

bash

# The proxy's dictionary slot (ERC-7201 namespaced)
DICTIONARY_SLOT="0x267691be3525af8a813d30db0c9e2bad5b0d2c0f67d9e4f1c769018cff56f4"

# Get dictionary address from proxy
cast storage $PROXY_ADDR $DICTIONARY_SLOT --rpc-url $RPC_URL

Block Information

bash

# Get current block number
cast block-number --rpc-url $RPC_URL

# Get block timestamp
cast block latest --json --rpc-url $RPC_URL | jq '.timestamp'

ICP Queries (via dfx)

Query OUC Canister

bash

# Get version
dfx canister call ouc getVersion

# Get proposal count
dfx canister call ouc getProposalCount

# Get specific proposal
dfx canister call ouc getProposal '(0)'

# Get auditor count
dfx canister call ouc getAuditorCount

Canister Status

bash

# Get canister status (cycles, memory, etc.)
dfx canister status ouc

# Get canister ID
dfx canister id ouc

Common Patterns

Compare Local vs Deployed (EVM)

•Read local handler selectors from SPEC.toml or source code
•Query dictionary for each selector's implementation
•Check if implementation addresses match expected
•Detect zombie references (impl with no code)

Upgrade Detection

•Take baseline snapshot (dictionary state at block N)
•Take current snapshot (dictionary state now)
•Compare implementations for each selector
•Detect Added/Removed/Changed/Unchanged

Risk Assessment for Auditor Assignment

Based on detected changes:

•Critical: Zombie references detected
•High: Multiple selector changes, core function upgrades
•Medium: Single selector change, non-critical function
•Low: Minor updates, configuration changes
•None: No changes detected

Environment Variables

bash

# EVM
export RPC_URL="https://eth.llamarpc.com"
export DICTIONARY_ADDR="0x..."
export PROXY_ADDR="0x..."

# ICP
export DFX_NETWORK="local"  # or "ic" for mainnet

Helper Functions

Parse hex address from cast output

bash

# Remove 0x prefix and pad
parse_address() {
  echo "0x$(echo $1 | sed 's/0x//' | tail -c 41)"
}

Check if address has code

bash

has_code() {
  local size=$(cast codesize $1 --rpc-url $RPC_URL)
  [ "$size" != "0" ]
}