#bit-field #polkadot #validation #distribution #blockchain #quorum #gossips

polkadot-availability-bitfield-distribution

Polkadot Bitfiled Distribution subsystem, which gossips signed availability bitfields used to compactly determine which backed candidates are available or not based on a 2/3+ quorum

26 major breaking releases

28.0.0 Dec 19, 2025
27.0.0 Dec 8, 2025
26.0.0 Oct 3, 2025
25.0.0 Aug 2, 2025
0.0.0 Nov 21, 2022

#5 in #quorum

Download history 1301/week @ 2025-11-13 1282/week @ 2025-11-20 1120/week @ 2025-11-27 1042/week @ 2025-12-04 857/week @ 2025-12-11 967/week @ 2025-12-18 765/week @ 2025-12-25 1045/week @ 2026-01-01 661/week @ 2026-01-08 933/week @ 2026-01-15 970/week @ 2026-01-22 1074/week @ 2026-01-29 1001/week @ 2026-02-05 1056/week @ 2026-02-12 1137/week @ 2026-02-19 961/week @ 2026-02-26

4,351 downloads per month
Used in 3 crates (2 directly)

GPL-3.0-only

650KB
11K SLoC

The bitfield distribution

In case this node is a validator, gossips its own signed availability bitfield for a particular relay parent. Independently of that, gossips on received messages from peers to other interested peers.

Dependencies

~110–155MB
~2.5M SLoC