EDIT: he got back to me
https://blockchain.info/tx/0baa1793f61c6e7e3548e8d87afb1b0294d010f7880d0e5a6bfde38a01d3d9c8
A man of his word!
Topic: help me derive in bulk (about 100) child addresses from xpub .. fast. BTC - 0.2 (Read 537 times)
December 05, 2016, 06:19:23 AM
A quick update: so far it seems like the OP's question was solved... He PM'ed me that he'd have to run the sollution by somebody else, and he promised he'd get back to me afterwards.
EDIT: he got back to me
https://blockchain.info/tx/0baa1793f61c6e7e3548e8d87afb1b0294d010f7880d0e5a6bfde38a01d3d9c8
A man of his word!
EDIT: he got back to me
https://blockchain.info/tx/0baa1793f61c6e7e3548e8d87afb1b0294d010f7880d0e5a6bfde38a01d3d9c8
A man of his word!
November 29, 2016, 10:35:33 AM
Thanks a lot mocacinno .
I am not sure if there is any difference between electrum xpub and other xpub . Anyway if this works for all please Please PM your btc address.
Also which library is being used ? Feel free to only answer after receiving the 50% upfront payment.
. I am not sure if there is any difference between electrum xpub and other xpub . Anyway if this works for all please Please PM your btc address.
Also which library is being used ? Feel free to only answer after receiving the 50% upfront payment.
The derivation path can differ from wallet to wallet... but by searching the correct path and adapting the script, it should work
I'm running on ubuntu 16.04.1 LTS (Xenial Xerus) running python 2.7 and i have installed bitcoin-python and pybitcointools in order to write some basic scripts.
November 29, 2016, 10:11:50 AM
Thanks a lot mocacinno .
I am not sure if there is any difference between electrum xpub and other xpub . Anyway if this works for all please Please PM your btc address.
Also which library is being used ? Feel free to only answer after receiving the 50% upfront payment. figured out the library being used: https://github.com/vbuterin/pybitcointools
Verified, solution works great!
So just need to know if it works for all xpubs and your btc address
. I am not sure if there is any difference between electrum xpub and other xpub . Anyway if this works for all please Please PM your btc address.
Verified, solution works great!
So just need to know if it works for all xpubs and your btc address
November 29, 2016, 09:10:09 AM
since you wanted to Do it yourself
in python, this works to create the first derived address using my electrum xpub
you'll need to put this one in a loop to browse trough all keys* , and bechmark it for speed tough... I have no idear if it's slower or faster for your implementation
* for example, the derivation of the second address would be:
EDIT: was a bit bored at work (slow day), decided to do the next part of the work for you, and i updated my post accordingly
Takes 5.157 seconds to generate 1000 addresses, since you mentioned your old script takes 0.1s/address, and you need 0.01s/address, i guess 0.0051 is well within the requested range (it's allmost 20 times faster instead of the requested 10 times)...
Second edit, since electrum uses m/0/ for receiving addresses, and m/1/ for change addresses, generating change addresses would be done by changing line
childkey1 = bip32_ckd('xpub_my_electrum_xpub', 0)
to
childkey1 = bip32_ckd('xpub_my_electrum_xpub', 1)
in python, this works to create the first derived address using my electrum xpub
Code:
from bitcoin import *
childkey1 = bip32_ckd('xpub_my_electrum_xpub', 0)
childkey2 = bip32_ckd(childkey1, 0)
key = bip32_extract_key(childkey2)
address = pubtoaddr(key)
print address
you'll need to put this one in a loop to browse trough all keys* , and bechmark it for speed tough... I have no idear if it's slower or faster for your implementation
* for example, the derivation of the second address would be:
Code:
from bitcoin import *
childkey1 = bip32_ckd('xpub_my_electrum_xpub', 0)
childkey2 = bip32_ckd(childkey1, 1)
key = bip32_extract_key(childkey2)
address = pubtoaddr(key)
print address
EDIT: was a bit bored at work (slow day), decided to do the next part of the work for you, and i updated my post accordingly
Code:
from bitcoin import *
childkey1 = bip32_ckd('xpub_my_electrum_xpub', 0)
for counter in range(1000):
childkey2 = bip32_ckd(childkey1, counter)
key = bip32_extract_key(childkey2)
address = pubtoaddr(key)
print address
Takes 5.157 seconds to generate 1000 addresses
, since you mentioned your old script takes 0.1s/address, and you need 0.01s/address, i guess 0.0051 is well within the requested range (it's allmost 20 times faster instead of the requested 10 times)...Second edit, since electrum uses m/0/
childkey1 = bip32_ckd('xpub_my_electrum_xpub', 0)
to
childkey1 = bip32_ckd('xpub_my_electrum_xpub', 1)
November 16, 2016, 04:58:59 AM
Pm sent
November 16, 2016, 04:55:05 AM
Original Post: https://bitcointalksearch.org/topic/derive-in-batches-addresses-of-an-xpub-programmatically-1680909
Job is helping me in deriving child keys from an xpub, in batches of say 100, fast! Current method takes 0.1 seconds per address which is atleast 10x times too slow for my needs.
0.2 BTC is what I am offering
NOTE: YOU DON'T HAVE TO WRITE ANY CODE. I can do that part, its understanding of how the job can be done, that I need a lot of help with.
Thanks
Edit:
I understand the public addresses (like normal bitcoin addresses) from an xpub are derived mathematically , using some algo. Current algo being used is extremely slow, takes 9 seconds to derive 100 addresses. I just want an implementation algorithm that would derive these keys fast!
A suggested library : https://github.com/bit-wasp/secp256k1-php - goes over my head, as far as understanding what/how it can do/work.
Quote
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 equal 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)
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 equal 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)
Job is helping me in deriving child keys from an xpub, in batches of say 100, fast! Current method takes 0.1 seconds per address which is atleast 10x times too slow for my needs.
0.2 BTC is what I am offering
NOTE: YOU DON'T HAVE TO WRITE ANY CODE. I can do that part, its understanding of how the job can be done, that I need a lot of help with.
Thanks
Edit:
I understand the public addresses (like normal bitcoin addresses) from an xpub are derived mathematically , using some algo. Current algo being used is extremely slow, takes 9 seconds to derive 100 addresses. I just want an implementation algorithm that would derive these keys fast!
A suggested library : https://github.com/bit-wasp/secp256k1-php - goes over my head, as far as understanding what/how it can do/work.
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