# `CCXT.WS.Auth.Sha512Newline`
[🔗](https://github.com/ZenHive/ccxt_client/blob/main/lib/ccxt/ws/auth/sha512_newline.ex#L1)

SHA512 Newline auth pattern — gate, gateio.

Signs `"{event}\n{channel}\n{req_params_json}\n{time_s}"` with
HMAC-SHA512 hex and wraps in a two-level frame (outer envelope +
inner `payload` map).

## Example Frame (gate)

    %{
      "id" => "request_id",
      "time" => 1699999999,
      "channel" => "spot.login",
      "event" => "api",
      "payload" => %{
        "req_id" => "request_id",
        "timestamp" => "1699999999",
        "api_key" => "api_key",
        "signature" => "hex_signature",
        "req_param" => %{}
      }
    }

## Config / opts

| Key | Location | Default | Purpose |
|---|---|---|---|
| `:channel` | `config` | `"spot.login"` | Login channel (per-market override) |
| `:request_id` | `opts` | `to_string(System.unique_integer([:positive]))` | Correlation id |
| `:timestamp_ms_override` | `config` | (unset) | Test-only — freezes the clock |

---

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