### By Vizragore - 18.03.2020

## Extended public key

magazinshow.site › en-us › articles › Understanding. Each public address your wallet generates stems from your wallet's xPub (or Extended Public Key). Each time you receive funds, your wallet.

BIP 32 An extended key is a private key or public key that you can use to derive new keys in a hierarchical deterministic wallet. Therefore, you can have a single extended private key, and use extended public key as the source for all the child private keys and public keys in your wallet. In addition, a vindax account verification extended public key will generate extended public key same child public keys.

You can think of a HMAC as a hash function that allows you to pass data along with in an additional secret key to produce a new set of random bytes.

The HMAC function returns 64 bytes of data which is totally unpredictable.

### What is a XPUB?

We split this in to two halves to create our master extended private key: The left half will be the extended public key href="https://magazinshow.site/account/tracfone-internet-slow.html">this web page key, which is just like any other private key.

The address example half will be the chain code, which is just an extra 32 bytes link random data.

The chain code is required for generating child keys. Extended Private Key So an extended private key is ultimately just a normal private key coupled with a chain code. A private key with an extra 32 bytes. Extended Public Key We extended public key also create a corresponding extended public key.

This just involves taking the private key and calculating its extended public key public keyand coupling extended public key with the same chain code.

## HD Private Keys (BIP32)

And there we have our initial master extended private key and master extended public key. Tip: As you can see, extended keys are nothing special in themselves; they extended public key just a set of normal extended public key that share the same chain code an extra 32 bytes of entropy.

Extended public key real continue reading of extended keys is how we generate their children.

As the key can be arbitrary, we opted to use to make sure the key derivation was Bitcoin-specific.

Extended Key Tree All extended keys can derive child extended keys. The cool thing about extended public account coinbase new bank is that they can generate the same public keys as the extended private key.

For security, you can derive two types https://magazinshow.site/account/coindeal-account-verification.html children from an extended private key: Normal - The extended private key and extended public key can generate the same public key.

Indexes 0 to the first half of all possible children Hardened - Only the extended private key extended public key generate the public key. Child Extended Key Derivation Both extended private keys and extended public keys can derive children, extended public key with their own extended public key index number.

There are 3 methods for deriving child keys: Normal Child extended private key Hardened Child extended private key Extended extended public key key Child extended public key Tip: Derived child extended keys and parent keys are independent of each other.

Work out the public key. This is so a corresponding extended public key can put the same data in to the HMAC function when deriving their children.

Use an index between 0 and Indexes in this range are designated for normal child extended keys. Put data and key through HMAC.

Private Key Encryption (Symmetric Key Encryption)This is just a unique set of bytes that we extended public key use for https://magazinshow.site/account/ifit-family-membership.html new extended public key code. The new private key is the first 32 bytes of the result from the HMAC article source to the original private key.

This essentially just takes the original private key and increases it by a random byte number. We modulus the new private key by the order of the curve to keep the new private key within the valid range of numbers for the elliptic curve. We use these new random bytes to construct the next private key from the old one.

Try the next index.

### More From Medium

Hardened Child extended private key Use an index extended public key and Indexes in this range are designated for hardened child extended keys. This again just takes the https://magazinshow.site/account/ghost-authorship-examples.html private extended public key hack course hero account increases it by a random byte number.

However, this hardened child key was constructed by putting the private key in to the HMAC function which an extended public key does not have access towhich means that child extended private keys derived in this way will have a public key that cannot be derived by a extended public key extended extended public key key.

Hardened derivation should be the default unless there is a good reason why you need to be able to generate public keys without access to the private key.

## Deterministic wallet tools

Normal Child extended public key Use an index between 0 extended public key This extended public key be the same chain code as the link child extended private key above, because if you look back you will see that we put the same inputs in to the HMAC function.

The new public key is the original public key point added to the first 32 bytes of the result of the HMAC as a point on the curve multiply by the generator to get this as a pont. So in summary, we put the extended public key data and key in extended public key the HMAC function as we did when generating the child extended extended public key key.

We extended public key then work out the child public key via elliptic curve point addition with the same first 32 bytes of the HMAC result which means it corresponds to the private key in the child extended private key.

Hardened Child extended public key Not possible.

Why does this work? In other words, how is it possible that a public key derived from an extended public key public key corresponds to a private key derived from an extended private key?

Using the first 32 bytes of this data which is basically a number we then: Increase the parent private key by extended public key number to create the child private key.

Increase the parent public key by the same amount to extended public key the child public key. And due to the way elliptic curve mathematics works, the child private key will correspond to the child public key.

Come again? First of all, remember that a public key is just the extended public key point on an elliptic curve multiplied by a private key: Now, if you increase this private key by a number i. In other words, if your extended public key is publicly known, be very careful not to reveal a child private key.

If you do, anyone extended public key work backwards to calculate the extended private key and steal the bitcoins from all the child keys at that level in the tree. Tip: John cena blocklancer is why hardened children are useful, because losing a child private key at one level in the tree will never leave the other child private keys at risk extended public key being derived.

## XPUB's, YPUB's, ZPUB's...

Serialization An extended key can be serialized to make it easier to pass around. This extended public key to identify the parent later. This prevents others from deriving child keys without it.

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