Bitcoin Core 31.0: SOLO Pool Node Updated
We upgraded the node behind our BTC SOLO mining pool to Bitcoin Core 31.0, the latest major release. Block templates are now built on the new cluster-based mempool, and the release continues the migration of the mining interface to the multiprocess IPC architecture.
What changed:
- Cluster mempool. Transaction ordering was rebuilt around clusters, improving how block templates are assembled and how fee-bumping (RBF and CPFP) is evaluated.
- Mining interface (IPC). Block-template creation moved further toward the separate mining interface; coinbase data is now returned in structured form.
- Node performance. The default database cache was raised to 1024 MiB on machines with 4 GB+ of RAM, and the fee-estimation floor was lowered to 0.1 sat/vB.
Nothing changes for you as a SOLO miner — we run and maintain the node. Point your SHA-256 hardware at solo-btc.2miners.com:2626 with your Bitcoin address as the worker name. If your rig finds a block, the full reward (3.125 BTC plus fees) is yours.
Quai (QUAI) Node Update: go-quai v0.53.0 (BIP-302 Fork)
Quai activated the BIP-302 consensus fork with go-quai v0.53.0 on May 15, 2026. We updated our Quai nodes ahead of activation, so the QuaiKawPow and QuaiSHA pools stayed in sync through the fork.
Key changes for miners:
- Reward recalculation. The fork renormalizes Quai’s block reward against SHA-equivalent difficulty; KawPoW difficulty is now expressed in SHA terms.
- Short conversion freeze. A brief hold interval applied around the fork’s activation window.
- Stability fixes. Added a recovery step when Prime/Region/Zone headers are out of sync on restart.
Mining is available on the QuaiKawPow and QuaiSHA pools, with SOLO options for both.
Zcash (ZEC) Node Update: Version 6.12.3 — Security Hotfix
Zcash released v6.12.3, a security hotfix that we applied to our ZEC pool node immediately.
The release fixes CVE-2024-52911, a critical use-after-free vulnerability in block validation. Any inbound peer could trigger it by sending a crafted invalid block, crashing the node during script verification — and bouncing invalid blocks between peers could amplify a single crash into a network-wide outage. Every multi-core node running the default settings was affected on v6.12.2 and earlier.
If you run your own Zcash node, upgrade to 6.12.3 without delay. Our pool node is already patched.
Ergo (ERG) Node Update: Version 6.0.3-RC1
Ergo published 6.0.3-RC1, a release candidate focused on block propagation and mempool handling. We are testing it against our ERG pool node.
Notable changes:
- Faster block announcement. A new block is now announced to peers immediately, before full validation — this reduces propagation delay and helps lower stale/orphan rates for miners.
- Mempool improvements. Better handling of fee-based transaction replacement and a fix for duplicate transaction IDs.
As a release candidate, 6.0.3-RC1 is a pre-release; we will move our pool to the stable build once it ships.
Kaspa (KAS) Block Reward Reduction
As defined by the Kaspa Tokenomics and its smooth monthly emission schedule, Kaspa underwent another scheduled block reward reduction in May.
- Previous Reward: 2.914 KAS
- New Reward: 2.75 KAS
Please pay attention! Kaspa mining profitability has changed. We have already updated 2CryptoCalc to reflect the new reward values. Mining is available on the KAS pool and KAS SOLO.
Nexa (NEXA) Block Reward Reduction
In line with the Nexa tokenomics, the Nexa block reward was halved in May.
- Previous Reward: 10,000,000 NEXA
- New Reward: 5,000,000 NEXA
Please pay attention! Nexa mining rewards per block have been cut in half. We have updated 2CryptoCalc accordingly. Mining is available on the NEXA pool and NEXA SOLO.
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