fix leading zero

[klim0v]

it was a mistake on the m/44H/60H/0H path
For example, mnemonic := "real town addict extend shoot name disagree vital turn live can tip"
got c64f0b3e510d03adef3f057d1814bdc8a7f904caafa6928550fc10670dcff031
wanted c29cd818232f40614691a58c9afcbd5518b539cb135d73b1d9e26d5f5f5dcbbe (https://iancoleman.io/bip39/)

        // Generate a Bip32 HD wallet for the mnemonic and a user supplied password
	seed := bip39.NewSeed(mnemonic, "")

	// Generate a new master node using the seed.
	masterKey, err := hdkeychain.NewMaster(seed, &chaincfg.MainNetParams)
	if err != nil {
		return nil, nil, err
	}

	// This gives the path: m/44H
	acc44H, err := masterKey.Child(hdkeychain.HardenedKeyStart + 44)
	if err != nil {
		return nil, nil, err
	}

	// This gives the path: m/44H/60H
	acc44H60H, err := acc44H.Child(hdkeychain.HardenedKeyStart + 60)
	if err != nil {
		return nil, nil, err
	}

	// This gives the path: m/44H/60H/0H
	acc44H60H0H, err := acc44H60H.Child(hdkeychain.HardenedKeyStart + 0)
	if err != nil {
		return nil, nil, err
	}

	// This gives the path: m/44H/60H/0H/0
	acc44H60H0H0, err := acc44H60H0H.Child(0)
	if err != nil {
		return nil, nil, err
	}

	// This gives the path: m/44H/60H/0H/0/0
	acc44H60H0H00, err := acc44H60H0H0.Child(0)
	if err != nil {
		return nil, nil, err
	}

	btcecPrivKey, err := acc44H60H0H00.ECPrivKey()
	if err != nil {
		return nil, nil, err
	}

	privateKey := btcecPrivKey.ToECDSA()

[jakesylvestre]

Can you add a description here?

[klim0v]

Can you add a description here?

Done

[jcvernaleo]

I see you added a bunch of examples to the github conversation. That is helpful, but could you add the description to the git commit messages? The git repo should be the main source of info rather than the associated github stuff?

Also, could you please add some test cases for this to the test code? For key related things it is extra important to have tests in the repo.

[klim0v]

#161