Use date+number to derive double spend hash

[theBergmann]

I thought about using the json-api of doublespend.cash to collect information about double spends and create statistics.

To do so I need to know the url before querying the api. With urls like
/txdata/cc4d87dc905b913ef4af8020e54f6dfda4a3017e.json
it seems impossible to write the program (at least for me :)
If you however derive the hash from something like date+number - for example: 2018062501, 2018062502 etc. - you can easily query the json-api to collect data about doublespends.

@GitCash send 0.005 bch to @dagurval

Update: I think it is this line:
"h.update(txid_first.encode() + txid_second.encode())"
in this file
https://github.com/dagurval/doublespend.cash/blob/master/respend/txdata.py

I guess replacing it with (date+k) requires some kind of loop to count k ...

[GitCash]

@dagurval

[theBergmann]

Oh, that was a bit low ... nice to see it working ... draining my account :)
@GitCash spend 0.01 bch to @dagurval

[GitCash]

@dagurval

[dagurval]

Would creating a static index of all double spends allow you create the statistics you're after?

For example txdata/index.json with array of

{
   'firstseen' : timestamp,
   'tx1' : txid,
   'tx2' : txid,
   'rawdata' : 'cc4d87dc905b913ef4af8020e54f6dfda4a3017e.json'
}

[theBergmann]

If it doesn't get too large, it would be perfect.

[dagurval]

I'll forward your tip into a bounty :-)

Bounty: Create an index as described in comment above.

@chaintip 180 days

[dagurval]

I've made a data dump of all the double spends available as a tar.gz file on the website

[chaintip]

Thank you @testtip! 0.01536902 BCH| ~ 8.26 USD has now been tipped to this issue.
To claim this bounty, get a pull request merged with @chaintip fixes #2 in the creation comment.