After bitcoin was created
In the past time when bitcoin was created, bitcoin users were later using addresses to make payment, but some people can make mistake at the time sending bitcoin to a wrong address, the bitcoin sent to a wrong address can not be recovered.
Bitcoin transactions are irreversible. Details in
Bitcoin WikiBut the creation of altcoins makes losses a usual occurrence in the crypto community.
What do you imply here?
After altcoins were created
Altcoins was created while ethereum was the first altcoin ever created, later followed were thousands of cryptocurrencies created.
Not correct. You can check before you conclude like that.
Altcoin announcement:
https://bitcointalk.org/index.php?board=159.38640;sort=last_post;descThere are altcoin projects were created before Ethereum and have ANN threads. Just in the forum, there might have more projects don't have ANN thread here.
Messari.io: Customize your filter with Genesis block date.
When some altcoins were created, they have their own blockchain, this makes error not to be much, anyone that can send to wrong address at the time can be blamed. But there are few errors, like the litecoin addresses that started with 3, some people can mistake it for a bitcoin address and send bitcoin to litecoin address, or send litecoin to bitcoin address, this is one of the ways some people lost bitcoin and litecoin in the past, but people using wallet that has private key can still recover back the coin.
You can write it "Make cross-chain transactions and lose money".
Token creation
Tokens are altcoins that do not have blockchain independently, I am not going deeper into this
Definition of tokensI will use ethereum blockchain to explain. There are many ERC20 tokens that make use of ethereum blockchain. Examples are Tether, USDC and thousands of cryptocurrencies like that. What makes this not perfect is that all the thousands of ERC20 tokens have a similar address like ethereum address, this makes some people send token to a wrong address, like sending Tether to USDC address on an exchange that do not support USDC, some can be recovered with the help of the exchanges customer care but most were lost.
Not correct. Ethereum and ERC-20 tokens have same address and you only need a wallet that supports ERC-20 tokens. If you have mnemonic seeds, you can import it and get your ERC-20 tokens.
People lost their ERC-20 tokens if they send them to exchanges that not support those tokens. Those tokens exist in those wallets but without seeds, they can not get it.
The smart contract
The altcoins are getting more complex and complicated for users with the introduction of some particular smart contract like the binance smartchain. Binance smartchain (BSC) addresses are the same as ERC20 tokens addreses, while some people will confuse it with Binance chain addresses (addresses that start with bnb), this has caused great losses for users. See the illustration below as a good example.
Exchange A support Coin A
Exchange B support Coin A
Coin A support ERC20 and BSC on Exchange A
Coin A support ERC20 but do not support BSC (Binance smart chain) on Exchange B
Because BSC addresses are like ERC20 addresses, if the sender send Coin A (BSC type) into an exchange (exchange B) that do not support BSC but support ERC20 for the coin, this will lead to loses. Only what can make the owner not to lose is to have the private key that can be used to recover the coins. Some exchanges can help too, but if low amount is lost, no help will be rendered.
Similar to your previous opinion. Don't move fund cross chains and read the guides of exchanges for what they support, what they don't support.
Private key is very important
All the ways listed above are potential ways people can lost crypto as people are complicating crypto, many people have lost cryptocurrencies because they are making use of exchanges, but if people know about all these, they will avoid losing coins to make sure they do not lose crypto into exchanges, but many people do complain how their tokens are lost this way. Having a private key to your wallet, it can be easily used to recover back such cryptocurrencies.
Use non custodial wallets for bitcoin and altcoins. Exchanges don't give you access to private key or mnemonic seeds. Most of exchanges don't support it.