Why Bitcoin Wallets needs Block Filters —> “The block filter process typically involves three steps. First, a user downloads the block filters representing the blockchain from a network peer in the case of Breez, or from the coordinator server in the case of Wasabi. Then, the light client checks to see if the addresses within the gap limit match a block filter. Finally, if there's a match, the corresponding block is downloaded.” — more info in this article -> https://bitcoinmagazine.com/technical/why-bitcoin-wallets-need-block-filters