How does one view addresses that were staking with a specific pool at a specific epoch boundary?
If there is any way to view a list of addresses that received staking rewards for a particular block, that could also do the trick.
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If you need any kind of specific on chain information that isn't found on third party explorers like Cardanoscan, you'd have to use db-sync yourself. (It's what all the explorers use)
To quote directly from the db-sync github:
" The purpose of Cardano DB Sync is to follow the Cardano chain and take information from the chain and an internally maintained copy of ledger state. Data is then extracted from the chain and inserted into a PostgreSQL database. SQL queries can then be written directly against the database schema or as queries embedded in any language with libraries for interacting with an SQL database.
Examples of what someone would be able to do via an SQL query against a Cardano DB Sync instance fully synced to a specific network is:
There are LOTS of examples in the interesting sql queries