Derive in batches, addresses of an xpub programmatically.

Abdussamad

legendary

Activity: 3612

Merit: 1564

Quote from: gyaani on November 14, 2016, 11:38:12 PM

For a given HD wallets public xpub (Extended public key), derive the public child addresses, in bulk.
This PHP script : https://github.com/dan-da/hd-wallet-addrs , derives public addresses, but does so one by one, which is sloww.
I am pretty sure it is possible to derive say 10 to 100 child addresses at one go. But how ?

I believe the library that bitcoin payments for woocommerce uses is faster than the bitwasp ones. I use it for my bitcoin address plugin too. You can grab it from either plugin.

In my plugin you'll find it in includes/libs. The ElectrumHelper file contains the static function mpk_to_bc_address that you can use.

The downside is that this is only for electrum. You'll have to modify it to use another address derivation.

fbueller

sr. member

Activity: 412

Merit: 266

Quote from: gyaani on November 16, 2016, 02:06:17 AM

Quote

You could always check out the extension for libsecp256k1 https://github.com/bit-wasp/secp256k1-php

(Note for googlers: the default branch does NOT compile for PHP5. Run

Code:

git checkout v0.0.8

in directory - secp256k1-php , before ./configure)

Thanks for this, but I can't figure out how to use or even understand it. Plus the examples in the README are for the latest branch which doesn't work with PHP5. So have no examples or documentation Sad

.
Anyhow, this looks like what I want? :

Quote

Public Key tweak by addition

secp256k1_ec_pubkey_tweak_add(resource $context, resource $publicKey, string $tweak32) takes the given $tweak value, converts it to a point, and adds the point to the $publicKey point. The result is written to the provided $publicKey memory location.

This function is useful for deterministic key derivation.

btw What is 'tweak' here ? Googling doesn't seem to help.

My Goal is to just generate public keys from an xpub. any guidance would be much appreciated

ty

> no examples or documentation.

Did you miss the tests directory Tongue

Don't install it too use its functions directly - bitcoin-php will adapt between it and PHPECC, so you don't write code any differently.

gyaani

newbie

Activity: 39

Merit: 0

Quote

You could always check out the extension for libsecp256k1 https://github.com/bit-wasp/secp256k1-php

(Note for googlers: the default branch does NOT compile for PHP5. Run

Code:

git checkout v0.0.8

in directory - secp256k1-php , before ./configure)

Thanks for this, but I can't figure out how to use or even understand it. Plus the examples in the README are for the latest branch which doesn't work with PHP5. So have no examples or documentation Sad

.
Anyhow, this looks like what I want? :

Quote

Public Key tweak by addition

secp256k1_ec_pubkey_tweak_add(resource $context, resource $publicKey, string $tweak32) takes the given $tweak value, converts it to a point, and adds the point to the $publicKey point. The result is written to the provided $publicKey memory location.

This function is useful for deterministic key derivation.

btw What is 'tweak' here ? Googling doesn't seem to help.

My Goal is to just generate public keys from an xpub. any guidance would be much appreciated

ty

fbueller

sr. member

Activity: 412

Merit: 266

hd-wallet-addrs seems to wrap `bitwasp/bitcoin` which has advanced several versions since then (bitcoin-lib-php has been retired), including one that sped up elliptic curve operations a bit. You could always check out the extension for libsecp256k1 https://github.com/bit-wasp/secp256k1-php

achow101

staff

Activity: 3374

Merit: 6530

Just writing some code

Try this library: https://github.com/Bit-Wasp/bitcoin-lib-php

gyaani

newbie

Activity: 39

Merit: 0

Sorry, should have been clearer.
The library I am using takes about 9 seconds to derive 100 addresses. I am guessing its wayyy too slow and can be potentially much faster.

My question:
Am i right in assuming its too slow ?
If it is can someone point me to an alternative library/script ?

achow101

staff

Activity: 3374

Merit: 6530

Just writing some code

So what's the problem? What is your question? That the given code is too slow? If so, then go find one that is faster.

IIRC the actual key derivation algorithm should not be that slow.

gyaani

newbie

Activity: 39

Merit: 0

That's what the current code seems to do as well

Code:

  for( $i = $start-1; $i < $end; $i ++ ) {
        $relpath = $relpath_base . (strlen($relpath_base) ? '/' : '') . "$type/$i";
        $abspath = strlen($abspath_base) ? $abspath_base . "/$type/$i" : '';
        $key = $master->derivePath($relpath);

        $address =  $key->getPublicKey()->getAddress()->getAddress(); // statement in the for loop.

        //stuff (store address in array) etc.
       
   }

The above code takes about 9 seconds to generate 100 keys. is this normal ?

achow101

staff

Activity: 3374

Merit: 6530

Just writing some code

Just make a for loop that increments the derivation path and derives another key.

gyaani

newbie

Activity: 39

Merit: 0

For a given HD wallets public xpub (Extended public key), derive the public child addresses, in bulk.
This PHP script : https://github.com/dan-da/hd-wallet-addrs , derives public addresses, but does so one by one, which is sloww.
I am pretty sure it is possible to derive say 10 to 100 child addresses at one go. But how ? I tried digging through the above scripts code, but am unable to figure this out.

Help please!

Just to be clear, public chlid addresses equals an address such as "14dXQGMby9q3TBAYFurAThvHBK29vr2ymg"

Thanks

btw I know I will have to check if the derived addresses have been used, but I got that part figured out! (For googlers: just send a JSON-RPC request to the method getaddressdeltas, to get info about multiple addresses)

Topic: Derive in batches, addresses of an xpub programmatically. (Read 1040 times)