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Title: How to get all addresses and associated txs for an XPUB with Blockchain.com API?
Post by: ykt on October 16, 2022, 01:45:35 PM

Hi,

I'm trying to get all addresses and their transactions for an xpub using Blockchain.com API, and right now pretty much drown drowning under the amount of new information :)
So hope somebody can clarify this for me.

As a first step, I'm sending a `multiaddr` request like this

Code:

GET https://blockchain.info/multiaddr?active=xpub...

And in return, I'm getting a JSON struct with three keys - `addresses`, `wallet` and `txs`

Code:


{
   "addresses":[
      {
         "address":"<sample xpub>",
         "change_index":10,
         "account_index":18,
         "final_balance":0,
         "n_tx":32,
         "total_received": <obfuscated>,
         "total_sent":<obfuscated>
      }
   ],
   "wallet":{
      "final_balance":0,
      "n_tx":32,
      "n_tx_filtered":32,
      "total_received":<obfuscated>,
      "total_sent":<obfuscated>
   },
   "txs":[...]
}

Every item under the `txs` list has inputs and outputs, and that's about the point where I'm stuck right now.

How do I figure out whether this is a "spend" or "receive" transaction in relation to a given xpub and what is the associated address?

Thank you.

Title: Re: How to get all addresses and associated txs for an XPUB with Blockchain.com API?
Post by: jackg on October 16, 2022, 02:01:06 PM

Why didn't you give us an example of what's in the txs?

When testing this with an xpub the two main things I can see that are probably useful are "balance" and "result" that come with each transaction (or seem to).

Title: Re: How to get all addresses and associated txs for an XPUB with Blockchain.com API?
Post by: nc50lc on October 17, 2022, 04:05:20 AM

Quote from: ykt on October 16, 2022, 01:45:35 PM

-snip- Every item under the `txs` list has inputs and outputs, and that's about the point where I'm stuck right now.

How do I figure out whether this is a "spend" or "receive" transaction in relation to a given xpub and what is the associated address?

Let's use this result as an example:

Code:

  "txs":[
      {
         "hash":"0202b8ba785d8befdbbeca1641a981d371ddfc2f5216a2d1fd78de7e8e460478",
         "ver":2,
         "vin_sz":2,
         "vout_sz":1,
         "size":335,
         "weight":1340,
         "fee":820,
         "relayed_by":"0.0.0.0",
         "lock_time":640369,
         "tx_index":4222712286272463,
         "double_spend":false,
         "time":1595650444,
         "block_index":640678,
         "block_height":640678,
         "inputs":[
.
.
.
         ],
         "out":[
.
.
.
         ],
         "result":-1820,
         "balance":546
      },

Below each transaction, there should be a "result" and "balance",
If the result is a negative value, that means that it's a "spend" transaction, "receive" if positive.
The associated address(es) are the "addr" in the "inputs" if it's a spend txn, in the "out" if it's a receive txn.

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Bitcoin => Development & Technical Discussion => Topic started by: ykt on October 16, 2022, 01:45:35 PM