2.6.1

[cmmarslender]

2.6.1 Chia blockchain 2026-3-18

What's Changed

Added

• Add BYC and CRT to default CAT list
• New inner puzzle meta-standard that has instructions for how a wallet can handle arbitrary authorization trees
• Work in Progress - PoS2 integration
• Use structured RPC errors in full_node_rpc_api

Changed

• Simplify and optimize TransactionQueue
• Use an adapted version of deficit round robin algorithm in TransactionQueue
• Forward send_transaction and cat_spend to create_signed_transaction
• Prioritize trusted peers in FullNodeAPI's send_transaction
• Add kw_only to all wallet RPC types
• Miscellaneous wallet RPC cleanups
• Tolerate quote related cost mismatch for older nodes
• Skip fetching additions and removals for non transaction blocks in FullNodeAPI's request_header_blocks
• Refactor connection handshake
• Reject unsolicited RespondCompactVDF messages
• Made log less chatty for compact proofs
• Harden full node store
• Validate QR bit in DNS seeder to only process queries
• Add missing request decorator to reject_removals_request
• Correct accounting of cost limits in offer summary computation
• Harden nodes message typechecking
• Harden the full node’s incoming connection logic
• Default to block creation 1
• Only update the fast forward state on successful validation in process_fast_forward_spends
• Bump chia_rs to 0.38.2

Fixed

• Revert accidental RPC parameter name change
• Augmented usage fix
• Blocktools double sub epoch summary hash bug
• Fix reorg edge case handling in the wallet protocol
• Prevent dangling SAVEPOINTs by shielding against cancellation
• Return RejectAdditionsRequest to wallets instead of raising an exception
• Close VDF client TCP connections properly
• Fix PendingTxCache eviction when encountering empty height buckets

Removed

• Drop support for macOS 13 (Ventura) and macOS 14 (Sonoma)

---

This discussion was created from the release 2.6.1.