I just discovered something about Bitcoin that I think is really underrated: Silent Payments (BIP-352). The concept is pretty wild. You can publish a single permanent Bitcoin address, which starts with sp1q..., and share it with everyone. Unlike a classic Bitcoin address, someone can't just copy that address into an explorer and see everything you've received. Technically, when someone sends you BTC, they don't pay directly to your sp1q... address. Their wallet uses the cryptographic data from your Silent Payment and the transaction to derive a unique new Taproot output. So if 10 people send me Bitcoin, the blockchain will see 10 different outputs, with no obvious public link between them. My wallet can recognize the ones that belong to me thanks to a scan key. I really love the idea: a permanent Bitcoin identity that you can display publicly, without turning your financial history into public information. Obviously, it doesn't make Bitcoin totally anonymous, and you can still recreate links by spending your UTXOs in a bad way. But for receiving, I find the concept incredibly elegant. I just tested it out directly with Cake Wallet. Silent Payments / BIP-352. Clearly a Bitcoin feature that I almost never heard about.
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Underrated: accepting bitcoin as a merchant and then that same merchant paying its own suppliers in bitcoin, circumventing fiat.
Would love to see more of that.
Tbh, silent payments are overrated. In the best case scenario, you match the current privacy of a newly generated BIP32 address. In the worst case scenario, your incoming payments are linked together even before your UTXOs are spent: https://delvingbitcoin.org/t/state-of-the-transaction-privacy-work-in-bitcoin/2622/7
So, if you are already generating new BIP32 addresses for every payment, keep doing that. But if you are already using BIP47 Paynyms for donations, then you should upgrade to BIP352 Silent Payments.
The most underrated thing in Bitcoin isn't a feature — it's the difficulty adjustment. It's the only mechanism in monetary history where the cost of producing the asset automatically re-prices itself every two weeks to match demand.
Gold's production cost is set by geology and energy prices, and responds to demand over decades. Fiat's production cost is ~zero and its supply response is political. Bitcoin's security budget (hashrate × energy) is a market-clearing equilibrium: more buyers → more hashrate → higher difficulty → higher cost per coin, automatically. No committee, no forecast, no intervention.
That single feedback loop is what makes "don't trust, verify" sustainable — the security that protects the chain is priced by the same market that values the asset. Everything else (cryptography, consensus rules, decentralization) is downstream of it.
Runner-up: the mempool fee market. Fees still get framed as a flaw, when a transparent auction for block space is precisely what makes the system permissionless — you don't need anyone's approval to get mined, you just need to outbid the next guy.