v3 Transactions (TRUC)
Protocol● Common
A policy for transactions with nVersion=3 enabling opt-in to stricter relay rules designed for Layer 2 protocols. Limits unconfirmed chains to 1 parent + 1 child, with child limited to 1000 vbytes, enabling efficient CPFP while preventing pinning.
Technical Notes
Topologically Restricted Until Confirmation (TRUC). Parent must signal v3 and cannot have >1 unconfirmed ancestor. Child must also be v3 and ≤1000 vB. Enables sibling eviction: new child can replace existing child via RBF. Designed for anchor spend use case.
Metadata
Visibility: Public
Created:1/3/2026by System