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Available on private testnetTestnet: yesMainnet: Not availableSoftware: solc 0.8.26+commit.8a97fa7a · Foundry 1.8.5Updated

Solidity
Pinned compiler 0.8.26+commit.8a97fa7a (Linux binary SHA-256 d5f23436…49ef; Windows 537fd8d8…eb67)
EVM target cancun (or london); never blobhash() / block.blobbasefee
Libraries OpenZeppelin Contracts 5.0.2 (MIT) — the version the Wallet Studio templates use
Status ✅ Tested: Foundry deploy/verify/call, ERC-20/721/1155, Wallet Studio

Install

curl -L https://foundry.paradigm.xyz | bash && foundryup --install 1.8.5   # Foundry
# forge fetches solc 0.8.26 automatically when foundry.toml pins solc_version; offline: FOUNDRY_SOLC=/path/to/solc

Project structure and config

foundry.toml
[profile.default]
src = "src"
out = "out"
libs = ["lib"]
solc_version = "0.8.26"     # pinned; matches contracts/studio/compilers.json
evm_version = "cancun"      # chain 77240 runs PUSH0/MCOPY/TSTORE; never use blobhash()/blobbasefee
optimizer = true
optimizer_runs = 200
bytecode_hash = "none"      # no metadata hash: deterministic runtime bytes for byte-for-byte verification
remappings = ["@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/"]

Example

src/Counter.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.26;

/// Starter counter (Solidity 0.8.26). Unaudited example.
contract Counter {
    uint256 private count;
    address public immutable creator;

    event Incremented(uint256 value);

    constructor() {
        creator = msg.sender;
    }

    function increment() external {
        count += 1;
        emit Incremented(count);
    }

    function get() external view returns (uint256) {
        return count;
    }
}

Compile, ABI, deploy

forge build                                   # artifacts in out/Counter.sol/Counter.json (abi, bytecode, deployedBytecode)
forge inspect Counter abi --json > Counter.abi.json
forge inspect Counter gasEstimates            # compiler estimates; real gas: see the measured table
forge create src/Counter.sol:Counter --broadcast --keystore "$KEYSTORE" --password-file "$PASSWORD_FILE" --rpc-url "$RPC"

Plain solc: solc --evm-version cancun --optimize --metadata-hash none --bin --abi Counter.sol -o out.

Gas and deployment cost

Measured: 115,466 gas to deploy the counter, 44,587 for the first increment() (table). Cost in PQAI = gas × (base fee + tip); with a base fee of a few wei, testnet deployment costs are negligible.

Verification

Byte-for-byte runtime comparison, masking immutables: Verification.

Security caveats

  • 0.8.x checked arithmetic reverts on overflow; unchecked blocks remove that protection.
  • Do not use block.prevrandao/block.difficulty as randomness: on PQWERAI it is the PoW difficulty.
  • tx.origin authentication, unbounded loops over user-controlled arrays, and reentrancy before state updates are the usual sources of loss — use checks-effects-interactions and pull payments (as ServiceEscrow does).
  • solc is GPL-3.0; your contract's license is your choice.

Example repository: developers/examples/first-contract/, token/, nft/ in the PQWERAI-testnet repository.

Sources at 72057fe3ec: contracts/studio/compilers.json · developers/examples/first-contract/foundry.toml · developers/examples/languages/Counter.sol

Found a problem? Report a documentation issue · Build testnet-rc1+72057fe3ec