Cronos POS Chain v8 Upgrade

Upgrade crypto-org-chain-mainnet-1 from chain-main v7 to v8.0.0 at block height 30,720,400 (targeted for 2026-07-14 15:00 HKT / 07:00 UTC).

v8.0.0 release: [Hidden link] Upgrade handler: "v8" (runs ModuleManager migrations).

Notable changes carried by this upgrade:

• feat(upgrade): module account converter (#1304)
• fix(x/tieredrewards)!: harden position delegator address derivation against pre-creation squatting (#1308)
• fix(x/tieredrewards): block vesting accounts from creating tier positions (#1305)
• fix(x/nft): validate denom Id (IBC-aware) instead of Name in genesis so denoms with free-form names round-trip through export/import (#1312)
• chore: disable ICS-721 (#1298)

At the upgrade height (30,720,400), nodes running v7.3.0 will halt with the standard x/upgrade panic and must be restarted on the v8.0.0 binary. Module migrations (tieredrewards v1 -> v2, including delegator-address backfill and vesting-position exit) run on the first block after the upgrade height.

This upgrade plan was tested end-to-end on a local single-validator devnet using the official v7.3.0 -> v8.0.0 mainnet binaries: v7.3.0 halted cleanly at the planned height with the standard CONSENSUS FAILURE panic, and v8.0.0 picked up at that height, ran the migrations, and continued producing blocks. The same upgrade was previously executed successfully on testnet-croeseid-4 (proposal #1588, plan height 28,283,600 / 2026-06-23 15:00 HKT).