# `CCXT.Signing.HmacSha512Nonce`
[🔗](https://github.com/ZenHive/ccxt_client/blob/main/lib/ccxt/signing/hmac_sha512_nonce.ex#L1)

HMAC-SHA512 with nonce signing pattern (Kraken-style).

Used by: Kraken and ~20 other exchanges.

## How it works

1. Generate incrementing nonce (microsecond timestamp)
2. Add nonce to request body
3. Hash: `sha256(nonce_string + body)`
4. Concat: `url_path_bytes + hash`
5. Sign: `hmac_sha512(concat, base64_decode(secret))`
6. Encode as Base64

## Configuration

    signing: %{
      pattern: :hmac_sha512_nonce,
      api_key_header: "API-Key",
      signature_header: "API-Sign",
      nonce_key: "nonce"
    }

---

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