1. The library is popular 200 stars on github
2. I can generate a private key and use it to made operations with the library. That's using https://libbitcoin.info/
3. As I understand, that is only cryptography operations, so that can handle thousand address.

But yes I will have to maintain a bitcoin core even if I use this option, so why not using directly my bitcoin core RPC API with one wallet and multiple address ?

Someone told me that I can use this service from blockchain.com : https://github.com/blockchain/service-my-wallet-v3
I have to install a service on my server and I will be able to use an API.
Do you know more about that ?

Of course 3rd party API is the best way but the cost is incredible few thousands $ by month... (Bitgo for example)

Thanks all for you reply, you are very helpful  

I have the budget to store all the blockchain but if I can avoid it, I will.

Many of you are saying there is not the good option to use Bitcoin core for my use-case, thanks for the information.
@NotATether you are suggesting to generate a private key for every user, that something I can do. I found library to do that, I am able to generate private key of each user and get associated btc address without having bitcoin core. So I have to find the solution to create and sign a transaction from a private key.

So If I resume, the best solution to manage the creation and the managing of thousands of wallets, is not to use bitcoin core but to generate private key for each user and create raw bitcoin transaction and sign it with this private key.

Everyone agree with it ?

Thanks for the tip with Coin Control, you are a BTC core genious ! 
The only bad thing with this option is to retrieve a balance of  specific address. I checked and the only possiblity to get a address balance is to parse all the transactions.
So yes, anyway I will parse the transactions and store it in database, so I have the balance but if a security breach exist and someone are able to withdrawal more than he really have in his wallet, he will be able because the main wallet will have the money of everybody. It is very dangerous whereas if I create a wallet for each user, this case is not possible.
What do you think ? Maybe you know some security tips to avoid it ?


Users can use their wallets as a simple wallet, so they can receive and send crypto on it, it will be not only used to exchanges cryptos.

Hi @LoyceV,

Thanks for reply.

I already thought about the possibility of generating only address on the same wallets but the problem will be on the sending transaction. I need to send BTC from specific address but if I use the same wallet with many address, the sending address will always be the same.

You have right on this point, I will regulary check and store transactions on my database for each wallets, so I don't really need to have the whole blockchain history. That's a good point 

I am working on a crypto exchange platform, so I will have to generate multiple wallets on differents blockchains for each of users.
So we need to have something sure and secure on the long terms.

Hi @ranochigo,

Thanks for help.
I don't know if it can be use on my case because I have to generate new wallets from my server and not on the user device. Do you think it can be possible to set my server as a client to generate multiple wallets ?

Thanks all for your relevant replies !

@DaveF : You have right, this node will allow me to create multiple wallets and send transactions from each of them. Is it possible to create a wallet now and have to send a transaction in 5 years. But I have to regulary check if on each wallet a new transaction is coming on, thats why I need a long history of data. But as you said, maybe I can use my node for wallet creation/send transaction and an external API to check if new transaction exist for wallets.
I would like to save data space because I will have to sync 10+ differents blockchains...

Hi,

I am trying to determine if I could use pruning blockchain option on my future bitcoin node or not.

I will create a multiple wallets by RPC calls and I need to be able to check the history of transactions for each wallets, even if a wallet has been created 1 years ago for which the transactions blocks are no more present on the node due to pruning.

Do you know if it is possible to continue to check transactions of a generated wallet for transactions blocks who are no more kept ?

Thanks