How to download Bitcoin block headers from Blockchain.info and save to file?

I am just developing and testing Bitcoin mining application in plain Javascript (slow but can be run off-line).

To test it to work correctly I need to download Bitcoin block headers from Blockchain.info , 6 input parameters .

Are you aware how to call Blockchain API https://blockchain.info/api/blockchain_api

I don't use Bitcoin address, no other mining app, just need to download a number block headers from hashed blocks.

Any idea, demo, example or csv file coming with 6 input parameters as described in Bitcoin hashing algorithm

https://en.bitcoin.it/wiki/Block_hashing_algorithm

darius

Posted 2014-01-27T16:21:37.073

Reputation: 11

1ever thought of using testnet? – T9b – 2014-01-28T16:25:20.297

It might be easier to test (and more profitable to run) should you target an alt-coin rather than Bitcoin – Joe Pineda – 2014-03-12T13:43:25.433

Answers

You can download the blockchain headers from here. The data is binary packed, but can be deserialized easily enough. You seem to be trying to solo mine, which is a bad idea at the best of times, let alone with JavaScript. You also seems to be trying to build a SPV client. An easier way would just be to use https://blockchain.info/latestblock to get the lastblock hash and use that.

Bardi Harborow

Posted 2014-01-27T16:21:37.073

Reputation: 241

1Anyone have writeups on how to ingest the binary packed electrum data, or at least more info on what it is, exactly? – David Manheim – 2015-12-30T20:55:59.603

The data is the "block header" struct exactly -- https://en.bitcoin.it/wiki/Protocol_documentation#Block_Headers has the documentation. It's a fixed-length binary struct described there.

– user295691 – 2017-08-01T16:40:51.260