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# Block Types

:::info
`Block` is a re-export of ox's [`Block`](https://oxlib.sh/api/Block/types). Refer to the ox documentation for the full reference.
:::

## `Block.Block`

A Block as defined in the [Execution API specification](https://github.com/ethereum/execution-apis/blob/main/src/schemas/block.yaml).

## `Block.Hash`

A Block hash.

## `Block.Identifier`

A Block identifier.

## `Block.Number`

A Block number.

## `Block.Rpc`

An RPC Block as defined in the [Execution API specification](https://github.com/ethereum/execution-apis/blob/main/src/schemas/block.yaml).

## `Block.Tag`

A Block Tag as defined in the [Execution API specification](https://github.com/ethereum/execution-apis/blob/main/src/schemas/block.yaml).

* `earliest`: The lowest numbered block the client has available; - `finalized`: The most recent crypto-economically secure block, cannot be re-orged outside of manual intervention driven by community coordination; - `safe`: The most recent block that is safe from re-orgs under honest majority and certain synchronicity assumptions; - `latest`: The most recent block in the canonical chain observed by the client, this block may be re-orged out of the canonical chain even under healthy/normal conditions; - `pending`: A sample next block built by the client on top of `latest` and containing the set of transactions usually taken from local mempool.