If computers are state machines, money is abstract time & energy and bitcoin is the reverse reification of our time & energy in space, a space-time asset that maintains a distributed ledger by a distributed state machine.
Minimalist, Modular, Multi-functional vs Maximalist, Monolith, Multi-faceted
Ethereum smart contracts have become more resilient over the years because of many hard forks, radical non-conservative management and POS migration. If we implement covenants in ₿itcoin it will be wise to learn from Ethereum mistakes and to prevent ₿itcoin network getting stuck in similar loops and traps.
Non-fungible tokens represents a unique non-fungible digital asset that is stored in a blockchain. It tracks the proof of ownership of the digital asset from its very existence and its authenticity is verifiable on the blockchain.