private static String prefixHexNotation(final String hexValue) {
    return hexValue.startsWith(HEX_PREFIX) ? hexValue : HEX_PREFIX + hexValue;
  }
Checks if value is prefixed with '0x'

@param value that is checked
@return true if value is prefixed with '0x', false otherwise
ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/results/Quantity.java