Run a full node with modifications so that it can index the blockchain based on addresses like what the block explorers do so that there is an up to date list of addresses with all UTXOs.
OP also could run either block explorer/Electrum server, where OP could directly access database created by those.
Otherwise you can only use third party services like the existing block explorers with their limitations to get a historical snapshot of the blockchain, addresses or UTXOs. Like
this one to get addresses (base58 and others) with balance alongside maybe
this one.
It's great suggestion. Although LoyceV website seems to be down where my browser shows
ERR_CONNECTION_RESET or
PR_IO_TIMEOUT_ERROR.
what would you recommend to web scrap for batches of Base58 (legacy) addresses? what is the best way to find loads of them and inquire into their TXs and balance?
Blockchair.com has data dumps.
https://gz.blockchair.com/bitcoin/addresses/The file for Bitcoin addresses on 22-May-2024 01:23 is 1 GB. You can download the file (.tsv) and do your filter to check Legacy addresses and balances.
It's not practical due to default 10 kB/s limit though.
You can download 1 file at a time and the speed is limited to 10 kB/s. Our API keys are not applicable for increasing the download speed of data dumps. If you are a business or an academia/non-profit organisation that requires a higher speed, please contact us at <
info@blockchair.com>.