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Est3lar.

A private miner that found four Bitcoin blocks in October 2025, mining on its own rather than in a pool, and doesn’t say who runs it.

About Est3lar

Est3lar isn’t a pool that others can join. It found four Bitcoin blocks between 20 and 28 October 2025 by running ckpool, software for running a mining poolMining poolA group of miners who share the work of finding blocks and split the rewards, so each gets paid steadily instead of rarely., for its own machines only. The developer of ckpool called it “a large mining entity not mining in a pool”. It hasn’t found a block since.

Each of its blocks paid the whole reward to one Est3lar address in the block’s first transaction. That reward is separate from the transactions confirmed inside the block. The blocks are tagged “mined by Tether/Est3lar”.

Its website, now offline, described Est3lar in Portuguese as a company offering modular data centres powered by renewable energy. It named no company or people.

Background reviewed . Read the sources.

When it mined

First block20 Oct 2025Attributed to this pool
Last block28 Oct 2025No blocks since
Blocks found4All time

Share of all mining over time

Weekly estimates
27 Oct 20253 Nov 2025

Peak 0.3%, in the week of 27 Oct 2025

Every week the pool found blocks, as its share of all Bitcoin mining. Estimates come from observed blocks, rather than a direct reading of the pool’s machines.

Last blocks

Select a block to see its transactions
Block 921,130822 transactions + miner’s reward
28 Oct 2025
Block 920,7891,001 transactions + miner’s reward
25 Oct 2025
Block 920,472448 transactions + miner’s reward
24 Oct 2025
Block 919,923181 transactions + miner’s reward
20 Oct 2025

What this means for your payment

When a block containing your payment joins the Bitcoin blockchain, your payment gets its first confirmation. Later blocks add confirmations, whichever pool finds them. The pool name does not identify the sender or recipient of your payment.

Check a paymentStill waiting for confirmation?

Sources and how to read the data

Background comes from the sources below. Activity comes from the mempool-compatible API used by UTXOHub. Pool names are attributed using block tags and known reward addresses; they are not proof of an individual miner’s identity and may be incomplete or incorrect.