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I am looking for an efficient way of getting the last 200 blocks and being able to pull all transactions related to an address. I would like to do this for BTC, ETH, and LTC. Is there any way to achieve this without running a full node for each blockchain myself? Any advice would help. Thank you!

*This is my first post. Any advice on how to write a better one also appreciated. Thank you.

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yes, you can do it for bitcoin using https://blockchain.info/api

For example here is an example how to get all transaction related to 1ADJqstUMBB5zFquWg19UqZ7Zc6ePCpzLE in last 200 blocks,

import urllib2, json


def main(blocks_to_check, address):

    current_block_height = json.load(urllib2.urlopen("https://blockchain.info/q/getblockcount"))

    for x in xrange(current_block_height - blocks_to_check, current_block_height):
        block = json.load(urllib2.urlopen("https://blockchain.info/block-height/%d?format=json" %x))
        for transaction in block["blocks"][0]["tx"]:
            if address in str(transaction):
                print transaction
                print transaction["hash"]

if __name__ == '__main__':
    main(200, "1ADJqstUMBB5zFquWg19UqZ7Zc6ePCpzLE")
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Bitcoin relies on verification instead of trust. Obtaining the data only on the last 200 blocks would require you to trust the data without a way to verify it. Now you could run a pruned node that will only keep the last 550 blocks on disk, but it initially downloads and verifies everything. Unfortunately running a pruned node does not allow you to see UTXO (balance) details of addresses you do not own; you would need a full node with transaction index on and write a block parser for that.

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