From 04b9e9c7265accbbce412e9d95cd7d0274b7dcae Mon Sep 17 00:00:00 2001
From: drgora <105062443+drgora@users.noreply.github.com>
Date: Thu, 3 Apr 2025 08:31:35 +0200
Subject: [PATCH] Add zkVerify Volta inflation parameters (#11448)

* Add inflation parameters for the zkVerify Volta testnet

* Fix division by 0

Fix division by 0 if ideal stake is set to 0 (i.e. not accounted for when computing the inflation).
---
 packages/apps-config/src/api/constants.ts        | 2 ++
 packages/apps-config/src/api/params/inflation.ts | 7 +++++--
 packages/react-hooks/src/useInflation.ts         | 6 ++++--
 3 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/packages/apps-config/src/api/constants.ts b/packages/apps-config/src/api/constants.ts
index 0e8ef9a9e5..ca7e8a1d13 100644
--- a/packages/apps-config/src/api/constants.ts
+++ b/packages/apps-config/src/api/constants.ts
@@ -42,3 +42,5 @@ export const VARA_NETWORK_GENESIS = '0xfe1b4c55fd4d668101126434206571a7838a8b6b9
 export const VARA_NETWORK_TESTNET_GENESIS = '0x525639f713f397dcf839bd022cd821f367ebcf179de7b9253531f8adbe5436d6';
 
 export const JOYSTREAM_GENESIS = '0x6b5e488e0fa8f9821110d5c13f4c468abcd43ce5e297e62b34c53c3346465956';
+
+export const ZKVERIFY_VOLTA_GENESIS = '0xff7fe5a610f15fe7a0c52f94f86313fb7db7d3786e7f8acf2b66c11d5be7c242';
diff --git a/packages/apps-config/src/api/params/inflation.ts b/packages/apps-config/src/api/params/inflation.ts
index c7ffb4c012..8ee26a03e7 100644
--- a/packages/apps-config/src/api/params/inflation.ts
+++ b/packages/apps-config/src/api/params/inflation.ts
@@ -3,7 +3,7 @@
 
 import type { ApiPromise } from '@polkadot/api';
 
-import { CERE_NETWORK_GENESIS, CERE_NETWORK_TESTNET_GENESIS, DOCK_POS_TESTNET_GENESIS, JOYSTREAM_GENESIS, KUSAMA_GENESIS, NEATCOIN_GENESIS, NFTMART_GENESIS, POLKADOT_GENESIS, VARA_NETWORK_GENESIS, VARA_NETWORK_TESTNET_GENESIS } from '../constants.js';
+import { CERE_NETWORK_GENESIS, CERE_NETWORK_TESTNET_GENESIS, DOCK_POS_TESTNET_GENESIS, JOYSTREAM_GENESIS, KUSAMA_GENESIS, NEATCOIN_GENESIS, NFTMART_GENESIS, POLKADOT_GENESIS, VARA_NETWORK_GENESIS, VARA_NETWORK_TESTNET_GENESIS, ZKVERIFY_VOLTA_GENESIS } from '../constants.js';
 
 interface InflationParams {
   auctionAdjust: number;
@@ -33,6 +33,8 @@ const VARA_NETWORK_INFLATION_PARAMS = { ...DEFAULT_PARAMS, maxInflation: 0, minI
 
 const JOYSTREAM_INFLATION_PARAMS = { ...DEFAULT_PARAMS, maxInflation: 0.03, minInflation: 0.0075 };
 
+const ZKVERIFY_VOLTA_INFLATION_PARAMS = { ...DEFAULT_PARAMS, auctionAdjust: 0, maxInflation: 0.025, minInflation: 0.025, stakeTarget: 0 };
+
 const KNOWN_PARAMS: Record<string, InflationParams> = {
   [CERE_NETWORK_GENESIS]: CERE_NETWORK_INFLATION_PARAMS,
   [CERE_NETWORK_TESTNET_GENESIS]: CERE_NETWORK_INFLATION_PARAMS,
@@ -47,7 +49,8 @@ const KNOWN_PARAMS: Record<string, InflationParams> = {
   [NFTMART_GENESIS]: { ...DEFAULT_PARAMS, falloff: 0.04, stakeTarget: 0.60 },
   [POLKADOT_GENESIS]: { ...DEFAULT_PARAMS, stakeTarget: 0.75 },
   [VARA_NETWORK_GENESIS]: VARA_NETWORK_INFLATION_PARAMS,
-  [VARA_NETWORK_TESTNET_GENESIS]: VARA_NETWORK_INFLATION_PARAMS
+  [VARA_NETWORK_TESTNET_GENESIS]: VARA_NETWORK_INFLATION_PARAMS,
+  [ZKVERIFY_VOLTA_GENESIS]: ZKVERIFY_VOLTA_INFLATION_PARAMS
 };
 
 export function getInflationParams (api: ApiPromise): InflationParams {
diff --git a/packages/react-hooks/src/useInflation.ts b/packages/react-hooks/src/useInflation.ts
index 73d0ab7263..02222ee050 100644
--- a/packages/react-hooks/src/useInflation.ts
+++ b/packages/react-hooks/src/useInflation.ts
@@ -24,13 +24,15 @@ function calcInflation (api: ApiPromise, totalStaked: BN, totalIssuance: BN, num
   // Ideal is less based on the actual auctions, see
   // https://github.com/paritytech/polkadot/blob/816cb64ea16102c6c79f6be2a917d832d98df757/runtime/kusama/src/lib.rs#L531
   const idealStake = stakeTarget - (Math.min(auctionMax, numAuctions.toNumber()) * auctionAdjust);
-  const idealInterest = maxInflation / idealStake;
+  const idealInterest = idealStake === 0
+    ? 0
+    : maxInflation / idealStake;
   // inflation calculations, see
   // https://github.com/paritytech/substrate/blob/0ba251c9388452c879bfcca425ada66f1f9bc802/frame/staking/reward-fn/src/lib.rs#L28-L54
   const inflation = 100 * (minInflation + (
     stakedFraction <= idealStake
       ? (stakedFraction * (idealInterest - (minInflation / idealStake)))
-      : (((idealInterest * idealStake) - minInflation) * Math.pow(2, (idealStake - stakedFraction) / falloff))
+      : ((maxInflation - minInflation) * Math.pow(2, (idealStake - stakedFraction) / falloff))
   ));
 
   return {