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Hierarchical Deterministic Node
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The HDNode class in js-moi-sdk represents a Hierarchical Deterministic (HD) Node 
used for cryptographic key generation and derivation. It follows the `BIP-32 
<https://en.bitcoin.it/wiki/BIP_0032>`_ standard and allows the creation of 
hierarchical deterministic wallets. With HDNode, developers can generate and 
derive child keys, create private and public keys, derive MOI account addresses, 
and serialize/deserialize HDNode instances. It simplifies the management of 
multiple addresses and keys within a single wallet, enhancing security and 
organization.

HDNode
------
A class representing a Hierarchical Deterministic (HD) Node used in cryptographic key generation and derivation.

Methods
~~~~~~~

.. autofunction:: HDNode.fromSeed

.. code-block:: javascript

    // Example
    const mnemonic = "behind wish visual father ...";
    const seed = await mnemonicToSeed(mnemonic);
    const hdNode = HDNode.fromSeed(seed);
    console.log(hdNode)

    >> HDNode

.. autofunction:: HDNode.fromExtendedKey

.. code-block:: javascript

    // Example
    const hdNode = HDNode.fromExtendedKey(...);
    console.log(hdNode)

    >> HDNode

.. autofunction:: HDNode#derivePath

.. code-block:: javascript

    // Example
    const hdNode = HDNode.fromSeed(...);
    const childHDNode = hdNode.derivePath("m/44'/7567'/0'/0/1");
    console.log(childHDNode)

    >> HDNode

.. autofunction:: HDNode#deriveChild

.. code-block:: javascript

    // Example
    const hdNode = HDNode.fromSeed(...);
    const childHDNode = hdNode.deriveChild(1);
    console.log(childHDNode)

    >> HDNode

.. autofunction:: HDNode#publicKey

.. code-block:: javascript

    // Example
    const hdNode = HDNode.fromSeed(...);
    const publicKey = hdNode.publicKey();
    console.log(publicKey)

    >> Buffer

.. autofunction:: HDNode#privateKey

.. code-block:: javascript

    // Example
    const hdNode = HDNode.fromSeed(...);
    const privateKey = hdNode.privateKey();
    console.log(privateKey)

    >> Buffer