When you spend Bitcoin, you typically have a change output (UTXO). This is because your current UTXOs likely don’t have the exact amount you’re trying to pay.
When you try to spend BTC, you use one or more of your UTXOs and create a payment output and a change output for yourself (based on what you overpaid).
By consolidating UTXOs, you (kind of) turn change/coins into notes, meaning less future UTXO inputs and cheaper Bitcoin transactions (as you pay per data size, and more UTXO is more data).
Other reasons include privacy motives or managing KYC/Non-KYC linked coins. Or migrating to new address types like taproot.
UTXO being an unspent transaction output.
An interesting Nostr feature could be time warp - where you pick a past date and your client basically loads events from that period.
Maybe interesting as a global filter, or maybe even just on a per identity basis - what was pubkey X saying 900 days ago?
Re-live new years every day, or check if someone you follow used to promote shitcoins.
Depends on your Nostr client. Basically you have to use @ npub1f6ugxyxkknket3kkdgu4k0fu74vmshawermkj8d06sz6jts9t4kslazcka
Without the space after the @. Ava’s public key (npub…) will be on her profile somewhere.
I can’t see why this approach can’t work for Nostr in a decentralised world. When identities update their profile, client apps can optionally accept the photo/name changes. Kind of like the original pet names NIP concept, extended to include photo. 
Thank our browser overloads. Nothing was compatible, then most things, and now it’s rehashes of the same few projects, each stalling innovation based on their corporate business moats. #LazyProfitWins
The real challenge with Nostr is largely surrounding it’s decentralised first mantra. Many problems solved in centralised ways, don’t apply for Nostr - it means starting from scratch. Proven computer science approaches literally don’t exist yet, or are early.
Limitless identities/accounts, fake likes/reposts, spam, recommendations, discovery, content filtering/personalisation, funding, media hosting/content hash addressing, etc.
Bitcoin largely solved a single, yet crazy important decentralisation problem. Many many more still remain. Nostr is both an Interface and foundation, where many more of these decentralisation challenges can develop robust approaches on. It’s not a golden egg with everything solved or perfect.
Is components trying to solve the same problem as this? https://github.com/blakejakopovic/nostr_event_parser
POC NoKYCTranslate.
If there are other pricing models people would like me to try support, let me know. Focusing on subscription (pay ahead with expiry, until bolt12), and pre-paid credits (with sat as the unit, no funny money shitcoin like arcades). 
POC Paid Service UI for Snort. 
Some tweaks. Slowly building the data models and mocking event data to make this possible. 
Maybe with UI similar to this. Tap the home feed title and pick a view.
Yep. It’s premised on trusting who you follow isn’t a jerk 😝
Even just counting zaps and uniquing once per event id per following pubkey. You could zap everything cheaply, however it’s not an exact science… just a way to help ingest information in different ways.
I think it’s valuable as it basically helps expose you to content from people/topics you care more about, by people you are following and that normally you wouldn’t see unless your followers reply directly - and your reading the posts and replies timeline.
I’m still kind of surprised I haven’t seen a Nostr client app that has a consolidated likes/zaps view based on what the people I’m following, have reacted to. It’s a pretty simple algo to start with, without weird manipulation.
Pretty sure it’s just get all kind 7/zap where authors = who I follow, since 24 hours ago, and then extract e tags, perhaps rank based on unique count/amount/etc and fetch events.