add v2 changeset

.changeset/finalize_v2_hardfork_dates.md

@@ -0,0 +1,26 @@
+---
+default: major
+---
+
+# Finalize V2 Hardfork Dates
+
+The V2 hardfork is scheduled to modernize Sia's consensus protocol, which has been untouched since Sia's mainnet launch back in 2014, and improve accessibility of the storage network. To ensure a smooth transition from V1, it will be executed in two phases. Additional documentation on upgrading will be released in the near future.
+
+### V2 Highlights
+- Drastically reduces blockchain size on disk
+- Improves UTXO spend policies - including HTLC support for Atomic Swaps
+- More efficient contract renewals - reducing lock up requirements for hosts and renters
+- Improved transfer speeds - enables hot storage
+
+### Phase 1 - Allow Height
+- **Activation Height:** `513400` (March 10th, 2025)
+- **New Features:** V2 transactions, contracts, and RHP4
+- **V1 Support:** Both V1 and V2 will be supported during this phase
+- **Purpose:** This period gives time for integrators to transition from V1 to V2
+- **Requirements:** Users will need to update to support the hardfork before this block height
+
+### Phase 2 - Require Height
+- **Activation Height:** `526000` (June 6th, 2025)
+- **New Features:** The consensus database can be trimmed to only store the Merkle proofs
+- **V1 Support:** V1 will be disabled, including RHP2 and RHP3. Only V2 transactions will be accepted
+- **Requirements:** Developers will need to update their apps to support V2 transactions and RHP4 before this block height