What is the synchronization principle in Bittorrent Sync?

Question

bittorrent

A regular torrent has a fixed number of blocks. In simple terms, the client sends a bitmask of blocks, specifying 1 if the block exists and 0 when the block needs to be downloaded. In response, other clients can report that they have the desired block.
How does synchronization work in Bittorrent Sync? After all, it is necessary to compare not the fixed contents of the "pool", but to fully monitor the addition of new files. What principle is used?

Answer 1

https://ru.wikipedia.org/wiki/BitTorrent_Sync