# `BoundedAuthorityProtocol.V1.HistoricalPublicKey`
[🔗](https://github.com/baselabs/bounded_authority_protocol/blob/v1.0.0/lib/bounded_authority_protocol/v1/historical_public_key.ex#L1)

One exact caller-supplied historical public key and validity window.

## Fields

* `key_id` - the key identifier: 1 to `kid_bytes` (128) bytes of ASCII letters, digits, `-`, `.`,
  `_` or `~`.
* `public_key` - the raw public key in the suite's fixed width: 32-byte Ed25519 under
  contract-majors 1 and 2, the 65-byte uncompressed SEC1 P-256 point `0x04 || x || y` under
  contract-major 3.
* `valid_from` - the inclusive start of the window, integer Unix time in seconds.
* `valid_before` - the exclusive end of the window, integer Unix time in seconds, or `:unbounded`.

# `t`

```elixir
@type t() :: %BoundedAuthorityProtocol.V1.HistoricalPublicKey{
  key_id: binary(),
  public_key: binary(),
  valid_before: integer() | :unbounded,
  valid_from: integer()
}
```

One historical public key and its validity window.

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*Consult [api-reference.md](api-reference.md) for complete listing*