Required Fields will never have a default value, empty defaults means null.

All Fields can be set via setName e.g. block.setUnlocalizedName("name"); and gotten via getName;

Nome	Tipo	Required	Default Value	Notes
Nome axisAlignedBB	Tipo MCAxisAlignedBB	Required No	Default Value Full Block	Notes Lets you set the block's bounding box
Nome beaconBase	Tipo boolean	Required No	Default Value no	Notes Can this block be used as part of a beacon's base?
Nome blockColorSupplier	Tipo IBlockColorSupplier	Required No	Default Value -1 as color	Notes The block's color
Nome blockHardness	Tipo float	Required No	Default Value 5.0	Notes How long it takes to break
Nome blockLayer	Tipo String	Required No	Default Value "SOLID"	Notes "SOLID", "CUTOUT_MIPPED", "CUTOUT", "TRANSLUCENT"
Nome blockMaterial	Tipo IMaterialDefinition	Required No	Default Value Iron	Notes The Block's base material
Nome blockResistance	Tipo float	Required No	Default Value 5.0	Notes Explosion resistance
Nome blockSoundType	Tipo SoundType	Required No	Default Value Metal	Notes The Block's sound type (determines things like the breaking sound)
Nome creativeTab	Tipo CreativeTab	Required No	Default Value Misc	Notes The Creative tab the item will appear in
Nome dropHandler	Tipo IBlockDropHandler	Required No	Default Value ​	Notes What the block will drop when broken
Nome entitySpawnable	Tipo boolean	Required No	Default Value sì	Notes Can be used to prevent any entities from spawning on this block
Nome enumBlockRenderType	Tipo String	Required No	Default Value "MODEL"	Notes "INVISIBLE", "LIQUID", "ENTITYBLOCK_ANIMATED", "MODEL" → Sets how the block is rendered
Nome fullBlock	Tipo boolean	Required No	Default Value True	Notes Used for rendering and light calculations
Nome gravity	Tipo boolean	Required No	Default Value no	Notes Is this block affected by gravity
Nome itemColorSupplier	Tipo IItemColorSupplier	Required No	Default Value -1 as color	Notes The block's color when it is in item form
Nome lightOpacity	Tipo int	Required No	Default Value 255 if fullBlock is true or 0	Notes Does Light pass through
Nome lightValue	Tipo int	Required No	Default Value 0	Notes Light level of block, ranges from 0-1. This value is multiplied by 15 to determine the final value.
Nome onBlockBreak	Tipo IBlockAction	Required No	Default Value ​	Notes Called when Block is broken.
Nome onBlockPlace	Tipo IBlockAction	Required No	Default Value ​	Notes Called when Block is placed.
Nome onRandomTick	Tipo IBlockAction	Required No	Default Value ​	Notes Called on a random tick event.
Nome onUpdateTick	Tipo IBlockAction	Required No	Default Value ​	Notes Called when Block receives a block update.
Nome passable	Tipo boolean	Required No	Default Value Depending on the IMaterialDefinition provided	Notes Can players pass through this block?
Nome replaceable	Tipo boolean	Required No	Default Value Depending on the IMaterialDefinition provided	Notes Can this block be replaced by another block?
Nome slipperiness	Tipo float	Required No	Default Value 0.6f	Notes Ice blocks are 0.98f
Nome textureLocation	Tipo CTResourceLocation	Required No	Default Value null	Notes The block's resource location, used for textures etc.
Nome toolClass	Tipo String	Required No	Default Value pickaxe	Notes Tool required to Break Block
Nome toolLevel	Tipo int	Required No	Default Value 2	Notes Tool Level required to Break Block
Nome translucent	Tipo boolean	Required No	Default Value no	Notes Is see through
Nome unlocalizedName	Tipo String	Required Yes	Default Value ​	Notes Name, should be all lowercase
Nome witherProof	Tipo boolean	Required No	Default Value no	Notes Can Wither's destroy this block

ZenScript
 Copy
#loader contenttweaker

import mods.contenttweaker.VanillaFactory;
import mods.contenttweaker.Block;

var antiIceBlock = VanillaFactory.createBlock("anti_ice", <blockmaterial:ice>);
antiIceBlock.setLightOpacity(3);
antiIceBlock.setLightValue(0);
antiIceBlock.setBlockHardness(5.0);
antiIceBlock.setBlockResistance(5.0);
antiIceBlock.setToolClass("pickaxe");
antiIceBlock.setToolLevel(0);
antiIceBlock.setBlockSoundType(<soundtype:snow>);
antiIceBlock.setSlipperiness(0.3);
antiIceBlock.register();

You will need to add tile.contenttweaker.blockName.name=Localized Name to the responding language files.
If you have doubts, take a look at the display name of the item when you're holding it before translating it.

Alternatively, you could use CraftTweaker's localization feature, though it's recommended using the language files!