Anchor Mode / Block Type

In the examples above, we used AnchorMode.Any to indicate that the transaction can be "mined" in different ways. Stacks has two types of blocks: microblocks and (anchor) blocks.

• Microblocks (off-chain) are faster, but less reliable. Microblocks can be confirmed quickly but are not final until the microblock is included in an anchor block.
• Anchor Blocks (on-chain) are the normal Stacks blocks. They are slower, but more reliable. Anchor blocks are final and cannot be reverted.