Is there database of orphaned blocks?

https://blockchain.info/orphaned-blocks does not work right now

Does anybody keep them?

Also I am looking for those transactions which were not included in blocks (non-standard, double-spends, not enough fees, etc)

2 Answers 2


Do you need a user interface or to find them via API? We do not have UI at the moment for this (we will very soon) but you can definitely use our REST API to get them.

If the API is what you need then you can just use the following API call to filter ORPHANED blocks only.


If the transactions weren't included in the main chain then they will either be DEAD or PENDING and you can fetch them with the following API call:




Check out the link to our documentation and also you can use our testing tool which you can find here https://www.biteasy.com/developers/sandbox


In this: http://arxiv.org/pdf/1403.6676.pdf paper Christian Decker and Roger Wattenhofer describe their use of a system to monitor the bitcoin network for failed transactions.

Some tools are available on https://github.com/cdecker?tab=repositories .

Though not a database by itself, these tools might be useful for building such a database.

  • Thank you. I already have a tool, which saves all transactions and all blocks received from my peers. Unfortunately, I have to keep it online and connected 24/7 what is quite difficult for me. And I have to choose well-connected nodes to connect ( blockchain.info/hub-nodes also is broken ). This tool sniffes current network activity, but first of all i am interested in "bitcoin archeology" - those transactions which were in past but not accesseble now through the blochchain
    – amaclin
    Commented Jun 5, 2014 at 7:05

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