Hi! I’m working on an node + express API to consume ckBtc minter and ledger canister provided in IC documentation. I create a complete flow for deposit, convert to ckbtc, transfer to external wallets in ckbtc addresses.
Everything works fine but I have a question in the retrieve method. The candid flow explanations mentions that the method “to” address is obtained in the method get_withdrawal_account
and then deposit ckbtc to that address.
My doubt is placed here. I supposed to transfer with for example icrc1_transfer
to that address, and then call retrieve_btc
with the BTC address to deposit the amount?
Thanks for helping and I would try it but minimum amount is too expensive to that. I can’t risk 0.001 BTC to make a shoot on this.
I believe that you are following the previous flow.
There is a new flow which you can find in detail here under the Converting ckBTC to BTC section.
From a high-level, you have to:
-
Call icrc2_approve
with the account that you want to take ckBTC from on the ckBTC ledger to allow the ckBTC ledger to take ckBTC away
-
Call retrieve_btc_with_approval
with the same account above specifying the BTC amount and BTC address
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I Resolved it with the common transfer without approval. I was able to do it! I have now an issue with notify my users. Can I send you a message?
I am assuming that you went with the older method? Yes, feel free to provide more info.
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Well I didn’t found where to send you a private message, so I tell you here:
In my API I need to add something like a webhook, to call to the wallet backend to notify users when they receive a transfer. There’s anyway to do that? I was searching info and only found the get_events
method but it will have so many troubles to implement.
I have not a custom canister, I am using ckBtc Minter and Ledger and creating an address from unique value (username) and uuid. I need to know the exact time they receive a deposit to notify them.
If you could help me with this, I will be gratefull to you the rest of my life.
Have you looked into IC-Websocket?
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Im doing it right now, someone send me this link yesterday. Thanks! It may works