Bitcoin API with callback function?

[johba]

One of the problems is the generation of new addresses that can lead to very large wallet files over time. With blockchain.info you offload this stuff to them, if you do it yourself, you might want to look into rate limiting or something like that to avoid someone spamming your server with 1 million requests that would fill your wallet files and also maybe even DoS you with key generation.

I think that's easy to avoid using the getaccountaddress call with the bitcoind json rpc. It will only give you a new address once the previous one has been used in a transaction.

[1714138874]

1714138874

[1714138874]

1714138874

[Sukrim]

Then you'd end up with potentially presenting the same address to several users, as there will always be some lag time between presenting the user an address and the user sending something there.

The only thing to prevent this is to create some accounts on your service (which is something I want to avoid) or doing ugly things such as using IP addresses to distinguish between current users...

It might be possible to re-use addresses (if you re-implement the blockchain API, one could save all addresses that were not used for 1 week and then use these again) to migitate this somehow, still wallet bloat is an issue, as long as keys are 100% independent of each other and not BIP31. Even if Bitcoind (finally!) implements BIP31 deterministic keys, there is still the issue with Altcoins that are poorly maintained and that would take even longer to pull the necessary code.

Maybe creating a relatively large pool of addresses (e.g. 100k or so) that are rotated would work too, but that's actually backend stuff. Still, the "generating new address" part is what worries me most, the rest could be also simply polled with getreceivedbyaddress as already said.

[danystatic]

a REAL callback function, it could be possible with a cron job / script + walletnotify or other way I wish someone says the proper way :s

----------------------------
I did modifiy blockchain's php payment demo  and also  :   payment_button_v2.js
also
used bitcoin rpc  
----
why are you so opposed to learning the rpc, is easy, i could be a guide
It is 1 day thing.

[Benson Samuel]

Check my github in my signature. It has fully working code for Blockchain and Coinbase.

Both have been successfully implemented with callbacks, etc for 2 games as well.

https://github.com/bensonsamuel

[johba]

Then you'd end up with potentially presenting the same address to several users, as there will always be some lag time between presenting the user an address and the user sending something there.

The only thing to prevent this is to create some accounts on your service (which is something I want to avoid) or doing ugly things such as using IP addresses to distinguish between current users...

I'd say you have sessions for your users at least, to do basic things like shopping carts or even sticky load balancing. so map those to accounts and you will only ever need as much accounts/unused addresses as concurrent sessions. IMHO, bitcoind gives you some great tools at hand if you want to get things up and and running quickly.

If you want to build things neatly, build on bitcoinj/BOP with deterministic wallets, optimise wallet performance once needed, and then contribute your changes back instead of sitting on them.

blockchain.info is also not perfect, as you will have archive addresses to keep wallet performance up: http://blockchain.info/api/blockchain_wallet_api

[danystatic]

yes, sessions work for this, just hope the 'user' does not pays and close the web-explorer(chrome,firefox,etc..) before the session expires =)
I know it's a small time-frame, but possible
also
what about two clients asking for   getnewaddress(),  (php)

is it possible two clients get same address because they clicked almost at the same time?
I think is not possible but someone said it was, but I test it and still it is not working like that, but I don't know on a heavier load...

[ron_]

btcipn.com does the job pretty much well and it is easy to integrate if you are familiar with paypal ipn

- no 3rd party wallet (use your own wallet)
- no registration required
- your website will be listed on their home page

i have tested it and it works just great

[crypto777]

You can use GoUrl PHP Payment Bitcoin API -

https://gourl.io/


It is support callbacks.

[HackerBOSS]

Why callback blockchain.info don't work now?

[HackerBOSS]

You can use GoUrl PHP Payment Bitcoin API -

https://gourl.io/


It is support callbacks.

nice service..
but how use it?
need vps and node?
please tell me details

[HackerBOSS]

blockchain-info callback works now,
they have problem this it and fix now

[a7594li]

I　think blockchain-info callback works well.
there have no other problem.