CHANGELOG: release 0.103.0

Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>

CHANGELOG.md

@@ -2,6 +2,75 @@
 
 This document outlines major changes between releases.
 
+## 0.103.0 "Backwardation" (20 Oct 2023)
+
+A minor 3.6.0-compatible version of NeoGo with new salty ZKP-related
+functionality, a large batch of deprecated APIs removal and an experimental
+genesis block extension. Build Groth-16 circuits, generate proofs and deploy
+verification contracts easily with the new end-to-end ZKP example and `zkpbinding`
+NeoGo API. Setup node roles via the node configuration starting from the genesis
+block without any painful multisignature transaction forming and invoke any
+custom script in the genesis-level transaction with the new `Genesis` protocol
+configuration extension. And don't forget to move from deprecated RPC client
+APIs, as a lot of them have been removed.
+
+New node configuration format is finally adapted and the deprecated configuration
+sections are permanently removed according to the schedule. Pay attention to the
+`SecondsPerBlock` protocol configuration section that was replaced by
+`TimePerBlock`, a set of node and services address- and port- related configuration
+section that were replaced by the new `Addresses` format, direct `UnlockWallet`
+consensus configuration that was replaced by a separate `Consensus` section and
+a set of node-specific protocol configurations that were moved under a separate
+`P2P` section.
+
+This release fixes a set of bugs including a vulnerability introduced by changes
+in the transaction conflicts storage scheme implemented in #3061 (a part of
+0.102.0 release). With the patch presented, it's impossible to uncontrollably
+pollute the storage with malicious conflicting records. 
+
+This version is fully compatible with C# node 3.6.0. However, it requires
+complete resynchronization on upgrade due to the database storage scheme changes.
+
+New features:
+* API for Groth-16 verification contracts autogeneration and end-to-end example for
+  proving and verifying statements on NeoGo (#3043, #3146)
+* introduce genesis protocol extensions: default node roles designation and genesis
+  transactions (#3168)
+
+Behaviour changes:
+* a lot of deprecated functionality is dropped: RPC client old APIs, shared
+  Notifications channel of WebSocket client, SecondsPerBlock protocol
+  configuration, old way of services and node address and port configuration, old
+  P2P related application settings configuration, direct UnlockWallet consensus
+  configuration, direct node-specific protocol configuration (#3150)
+* database scheme is changed by new way of storing the transaction conflicting
+  records (#3138) 
+
+Improvements:
+* NeoFS SDK dependency upgrade (#3129)
+* gnark and gnark-crypto dependencies upgrade (#3145, #3162, #3163)
+* introduce timeout restriction for BoltDB opening (#3148)
+* bump code coverage uploading action version (#3153)
+* Go 1.21 support, bump minimum required Go version up to Go 1.19 (#3157)
+* upgrade golang.org/x/net version (#3158)
+* add protocol hardforks configuration to the `getversion` RPC response (#3160)
+* format autogenerated smart contract bindings with accordance to standard `go fmt` rules (#3164)
+* add "DO NOT EDIT" warning to the autogenerated smart contract bindings (#3167)
+
+Bugs fixed:
+* avoid race between `getnextblockvalidators` RPC call handler and blockchain's
+  block handler routine, significantly refactor native validators caching scheme
+  (#3110)
+* do not panic on failed NeoFS oracle requests (#3129)
+* enable Notary subsystem in NeoFS mainnet configuration (#3136)
+* reorganize storage scheme for transaction conflicting records to avoid possible attack (#3138)
+* properly deserialize wildcard trusts field of smart contract manifest (#3140)
+* use more strict GAS limit for transaction network fee calculation via RPC call (#3141)
+* avoid WebSocket client request blocking (#3142)
+* properly emit big uint64 constants during smart contract compilation (#3147)
+* avoid race access to the node version by tests (#3149)
+* make FindStorage* RPC client APIs to be always compatible with NeoC# RPC server (#3166)
+
 ## 0.102.0 "Aberration" (06 Sep 2023)
 
 Long-awaited feature-packed 3.6.0-compatible version of NeoGo with all the