Hello, solidity developers!
Who know the airdrop smart contract which users can claim the token.
If possible, please let me know the etherscan or bscscan or any links.
Or if you have the sol file, please send me.
Any help is welcome.

I have 25k wallets list that I should do airdrop to them.
And if I send tokens from my side, I should pay so much fee. So I want to make users can claim the token themselves. understand?

2 options:
whitelist with a mapping
or
merkle tree

How can I get 25k addresses in the mapping? The list is in the database

What is merkle tree?

Is there any guide of is there any such airdrop contract already existed?

Merkle three is something like binary tree in data structure that stores your data

Is there any guide link how to use it?

for merkletree you must use a dapp take in mind

Thank you mate! big help!

if you are not "expert" I would not advice to use it
the easier way is the mapping but will be expensive to store 25k addresses

I don't want to spend my funds to send tokens to 25k users. I want users claim themselves

I didn't say this

I said that you will spend a bit to store 25k addresses in a mapping

manually?

yes
you can batch them

I don't know the max number per time

maybe 1/2k

I am interested in merkle tree now

I will research about it

Thanks for your help mates!

https://github.com/a16z/zkp-merkle-airdrop-contracts

great! Thanks!

🤝

🤙🤙

cheapest for users gas will be to used signed coupons

Would you like to explain in more detail? Or any other samples or reference smart contract?

I don't have an example handy at the moment, but for 25k addresses, this signature method will be a good amount cheaper for the users than a merkle tree approach.. Essentially you use a wallet to sign all 25k coupons, and the contract is written to verify those signatures and only then release tokens to those addresses

assuming you don't want to pay a bunch of gas to just hydrate a huge mapping

If you can show me any smart contract like this, it would be amazing

(that would be cheapest for users)

I am curious too

btw why merkletree should be expensive? for users is just a claim button

It's not expensive per se, but for larger tree sizes, the signed coupon approach is cheaper to some degree

Since to verify a merkle proof, it has to calculate a bunch of hashes, the larger the tree, the more hashes to calculate when verifying

Compared to a signed coupon approach, where the contract just has to do one ecrecover no matter how large the set of addresses

if you can provide examples/sources about would be appreciate

Sure one sec

ah...almost forgot, I made a gist about this a few weeks ago...lol

https://gist.github.com/coffee-converter/e9ea05d73f5a857d55c90c4926e4c0b3

thanks will check soon

@wonderdarkhorse

yes, I got it

I will check it. Thanks!

found this too
https://github.com/bonedaddy/Postables-Payment-Channel

https://gitlab.com/jsanjuas/spacedrop/-/tree/master/


More info here
https://medium.com/@jsanjuas/spacedrop-an-airdrop-that-recipients-pay-for-87e4b87a0f83

https://medium.com/donkeverse/hardcore-gas-savings-in-nft-minting-part-2-signatures-vs-merkle-trees-917c43c59b07

This one

nice this channel is really useful haha, thanks!

Oh, I already posted a while back