  File: contracts/L1/tiers/MainnetTierProvider.sol

  66:               function getMinTier(uint256 _rand) public pure override returns (uint16) {
  67:                   // 0.1% require SGX + ZKVM; all others require SGX
  68: @--->             if (_rand % 1000 == 0) return LibTiers.TIER_SGX_ZKVM;
  69:                   else return LibTiers.TIER_SGX;
  70:               }
  File: contracts/L1/libs/LibProposing.sol

  199:                  // Following the Merge, the L1 mixHash incorporates the
  200:                  // prevrandao value from the beacon chain. Given the possibility
  201:                  // of multiple Taiko blocks being proposed within a single
  202:                  // Ethereum block, we choose to introduce a salt to this random
  203:                  // number as the L2 mixHash.
  204: @--->            meta_.difficulty = keccak256(abi.encodePacked(block.prevrandao, b.numBlocks, block.number));
  205:          
  206:                  // Use the difficulty as a random number
  207:                  meta_.minTier = ITierProvider(_resolver.resolve("tier_provider", false)).getMinTier(
  208: @--->                uint256(meta_.difficulty)
  209:                  );
  67:                   // 0.1% require SGX + ZKVM; all others require SGX
