Bitcoin Forum

1NiNja1bUmhSoTXozBRBEtR8LeF9TGbZBN from https://www.bitaddress.org/

How did they do that? They just keep making new addresses until they have the "perfect" one?

No, it's customized bitcoin address

You can also create your own customize address, here the tutorial to make it  [Guide] How to create your customized Bitcoin-Address (vanitygen) – step by step (https://bitcointalk.org/index.php?topic=5096373.0)

Most weird?
1FuckYouRJBmXYF29J7dp4mJdKyLyaWXW6   8)

Doesn't this require strong cpu? Especially for that 1BitcoinEaterAddressDontSendf59kuE, that guy completed an entire phrase in his public address. Can't imagine the time it took searching for the perfect private key...

That address didn't technically require any CPU runtime at all. It's a specifically crafted burning address. The address was crafted in such a way that it would be valid but it's public key is not mapped to any private key and thus it would never, in theory be able to be spent. Addresses like that are used to intentionally discard Bitcoins in a provable way.

I didn't fully understand this. So there is no point of creating an address like that? Is it useless?

It is useless if you want to spend from that address. If you want to make your Bitcoin unspendable[1], make an address like that and send your coins there. No one in the future, not even yourself is likely to obtain the private key to that address and it is effectively removed from circulation.

[1] https://en.bitcoin.it/wiki/Proof_of_burn

Adresses such as the BitcoinEaterAdress can be used for Proof of Burn:
https://en.bitcoin.it/wiki/Proof_of_burn

This might be interesting for some projects, but probably not for your own personal use.

If you want a vanity address that you can use for both receiving and spending coins, you need to use a tool like vanitygen as mentioned above. This tool generates one random private key and its corresponding address after another until it finds an address that fits your desired criteria (e.g. must contain the word "Ninja"). This process is fairly resource intensive and gets exponentially more difficult the more characters you desire, hence you're unlikely to see addresses with more than 6-7 custom characters.

If you just want an address to which coins can be sent without caring whether the coins are then spendable again, all you need to create a valid address is to have for it the correct checksum. Calculating the checksum for an address containing the desired phrase is more straightforward and much easier, hence why it's possible to generate addresses that consist almost entirely of custom characters. The downside is of course that you have no idea what the corresponding private key is.

Those are called vanity addresses. You will see a lot of these in this forum actually, and the longer the customized string gets, the harder it is to actually produce those. ETFbitcoin has already posted one of the weirdest addresses there is, although it technically isn't a fully-usable one since it is designed to just accept bitcoin but cannot be spent since it is not linked to any private key whatsoever, thus rendering the step to send bitcoin null.

Other cool addresses out there:

 1234mNnAPb8YnCsbacaNhB4BqwxB4U4321 (https://www.blockchain.com/btc/address/1234mNnAPb8YnCsbacaNhB4BqwxB4U4321) wherein the address starts with 1234 and ends in 4321;

 1woukheyeacxfpxtpkxjqxureevdkbywj (https://www.blockchain.com/btc/address/1woukheyeacxfpxtpkxjqxureevdkbywj) wherein all letters in the address are in lowercase;

 1ZVSGVQQHEGLWCUVEJAXBQZCFZZVFREUB (https://www.blockchain.com/btc/address/1ZVSGVQQHEGLWCUVEJAXBQZCFZZVFREUB) wherein all letters are capitalized, and;

 1EMBARraSSABLezwXrdWu1dDAVMMdJ7Ci2 (https://www.blockchain.com/btc/address/1EMBARraSSABLezwXrdWu1dDAVMMdJ7Ci2) longest real-word prefix generated so far.

1111111111111111111114oLvT2
https://www.blockchain.com/btc/address/1111111111111111111114oLvT2
I think that's the most weird address. I was checking the address "BitcoinEater" and found this one. It seems to the same of BitcoinEater address because none of the balance is used. It has only received tx.

They can, but they aren't exactly suitable for proof of burn, because they are only unsepndable as long as it's unfeasible to find such a long address with vanitygen. True proof-of-burn addresses are 100% unspendable, because they use scripts that can never evaluate to true, the wiki article that you linked shows a good example of it - a script that allows you to spend coins only if 2 + 2 == 5.

just use OP_RETURN and be done with it. it is small (the script only takes up 1 byte) and it is provably unspendable because by consensus rules the script evaluation fails as soon as it reaches OP_RETURN,
and most important of all the output that has OP_RETURN will never enter the UTXO database of nodes so there is no additional burden on full nodes whereas when other scripts (like the 1BitcoinEater....) is used the UTXO has to be included in the database even if _we_ know it will never be spent.

There are plenty of people that offer to generate vanity addresses either for free or for a small cost.

Usually, this cost is proportional to the number of characters you want to specify in the address, e.g. 5 or 6 letters is quite simple and can be cracked with your home computer.

However, if you're looking for vanity address with 7 or more characters, then this is exponentially more difficult, and will require some serious hardware to crack.

In any case, it's best to do it yourself, since whoever generates your address for you will also have access to your private key (unless very specific methods are used).

It is possible to keep your private key private if you do it with LoyceV. You will get partial private key by which you can get the full or such. Check his giveaway to learn more. However, it is always suggested not to use vanity address generated for others for saving purpose or for big transactions. For small, it is okay.
LoyceV vanity address giveaway- https://bitcointalk.org/index.php?topic=1813624.0