What are layers and bridges for?

A layer-one blockchain produces blocks, runs consensus and stores final state.

It balances security, decentralisation and capacity.

Scarce space can make transactions slow or expensive.

A layer two executes or bundles many operations away from the main layer.

It then publishes a proof or compressed batch to layer one.

It gains speed and lower costs while inheriting part — not always all — of the base security.

Each system chooses its proof mechanism, withdrawal delay and operators.

A sequencer may order transactions while layer one settles the final result.

Two networks using the same wallet do not necessarily share the same security.

A bridge does not teleport an asset: it coordinates two separate ledgers.

Often the asset is locked on one side and a representation is created on the other.

On return, the representation is destroyed and the original asset released.

A bridge must prove an event really occurred on the other network.

Compromised keys, too few validators or a verification bug can create unbacked assets.

Liquidity can also disappear, leaving a valid asset that is hard to use.

Destination — confirm the intended network in the wallet

Asset — verify the official representation address

Cost — keep native coins on both sides

Finality — wait for the stated delay before acting again

A layer two is an execution environment; a bridge is a passage between environments.

Before moving value, identify who validates, where it is locked and how it returns.

The cheapest route is not always the one requiring the least trust.