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;

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