[BOUNTY] Bitcoin blockchain monitoring site

[piuk]

I know this bounty is old, but I think blockchain.info meets the requirements to claim it.

Orphaned Block tracking:

http://blockchain.info/orphaned-blocks

Live list of unconfirmed transaction, if any double spends are detected they will be marked.

http://blockchain.info/unconfirmed-transactions (available in JSON with ?format=json)



Double spend list:

http://blockchain.info/double-spends

Thanks

[[Tycho]]

Hello.
Do any of pledgers have any other opinion about if this solution meets requirements and should be awarded ? Looks like it does.

[piuk]

Tycho, When I initially made the double spend page there was only one transaction, now there are 4. Is that you testing it?

I PM'd the other bounty contributors, but I don't think they are active anymore.

[[Tycho]]

Tycho, When I initially made the double spend page there was only one transaction, now there are 6. Is that you testing it?

No, I'm not.
I think that it's some broken client or attack against some broken client.

You can try to monitor for transactions with multiple instances of same input, that's what happens too, as my monitoring nodes show.
I heard that there was some old client storing them in memorypool or doing something else.

UPD: Also it may be caused by people restoring their wallets from backups or using wallet.dat copy accidentally.
What we should especially care for is double-spend attempts in orphaned branches.

[piuk]

Probably just accidental:

http://blockchain.info/tx-index/14760752/2c412e1ab2c66590f9be8d43e4d787eeaca167cec9a6a5f57651482ef2e737aa?show_adv=true
http://blockchain.info/tx-index/14760749/5a875fe607947f5d914eb5ef2ba7c7f6fb2319ceb77485297a7df520ccf7def0?show_adv=true

Two very similar, but with one different output address. The value probably isn't high enough to be malicious.

http://blockchain.info/tx-index/13084119/c407cc2973c191e50f6ef01630b417d0814e5030f493629c062a5852e94b8bd0

Is the only double spend between different orphaned branches in the entire database. I imported the blockchain from bitcoinchart's dump which contains orphaned blocks from way back in 2010, so it looks like there hasn't been any successful double spend attempts of any value.

[[Tycho]]

Would be nice if you can add info about which blocks they belong and which one is orphaned.

[Miner-TE]

I PM'd the other bounty contributors, but I don't think they are active anymore.

You are correct,  I haven't been active but I am a man of my word.  Where shall I send my 5 BTC?

[[Tycho]]

I PM'd the other bounty contributors, but I don't think they are active anymore.

Post a fresh address here, so award can be sent and checked by people.

[piuk]

Would be nice if you can add info about which blocks they belong and which one is orphaned.

Added.

You are correct,  I haven't been active but I am a man of my word.  Where shall I send my 5 BTC?

Thats great, Thank you to the both of you.

New Address 1JArS6jzE3AJ9sZ3aFij1BmTcpFGgN86hA

[[Tycho]]

New Address 1JArS6jzE3AJ9sZ3aFij1BmTcpFGgN86hA

My pledge is paid (50 BTC).

[piuk]

Received, cheers Tycho.

[goatpig]

New Address 1JArS6jzE3AJ9sZ3aFij1BmTcpFGgN86hA

paid my 10 BTC pledge

[Miner-TE]

Just sent my 5 BTC.

[shackleford]

Sent and thanks

[piuk]

Thank You to everyone that honoured the bounty. All payments have been received.

Next on my TODO list is to make an API call that merchants can use.