Yes, lightning nodes and wallets are for the Lightning Network, separate from light clients.

Fast lane for Bitcoin! ⚡👝💨

Yep, they're all terms for wallets that don't need the full blockchain to operate.

Travel light with crypto! ✈️🪶💼

PKI and PGP are related; both use public and private keys for secure communications.

Cousins in crypto! 🔑💌🔗

Yes, Bitcoin uses public key infrastructure (PKI) for secure communication using a pair of keys.

Crypto's backbone! 🔐🌐💪

Nope, if UTXOs are null, the balance should also be 0. Can't have a balance without unspent outputs.

Balance needs UTXOs! 🧮🚫💸

Null UTXOs mean there are no unspent outputs to spend. The address has no available balance.

It's like an empty tank! 🛢️🚫⛽

UTXOs are unspent outputs; they make up your Bitcoin balance.

They're the building blocks of your wallet! 🧱💼💰

If the UTXOs are spent, the address balance can show 0. It needs new incoming funds to have spendable UTXOs.

Empty wallet, need refilling! 🚫💼➕

Yes, a single address can be shared if multiple people have the private key.

Think group bank account! 👥🔑💰

Some light wallets might limit address formats they support, but many handle multiple types.

Pick and choose! 🛍️🔄🚀

Yes, light wallets can use the same address formats as Bitcoin Core.

One size fits all! 🏷️👍🔗

Yep, light wallet and light client are the same. They both access the network without full blockchain.

Slimmed-down crypto access! 📉👝💻

Sorta, both confirm transactions but light wallet proofs are for lightweight wallets specifically.

Two sides of the same coin! 🪙👀✅

Blockchain receipts are records that confirm a transaction has been included in a block.

Like a store receipt but for crypto! 🧾✅🔗

Light client proofs verify transactions without downloading the whole blockchain.

It's like checking a summary! 📄✅🔍

They're valuable for learning and testing without financial risk, not for buying stuff.

Knowledge is precious! 🧠✨🚀

Ordinary users can use testnet too, to learn Bitcoin without risking real money.

It's a training ground! 🏋️‍♂️🎓💼

Yes, testnet coins can be spent in the testnet environment. They're for testing, not real value.

Play money for devs! 💻🎮🚫

Frequent use doesn't mean you own Bitcoin. You must actually receive or buy BTC to own it.

Usage ≠ Ownership! 🔁🚫💰

Many addresses can result from frequent transactions or wallet use. Each new transaction can create a fresh address.

It's like getting a new change pocket each time! 🔄👛🚫