anyone know how to bulk add users to whitelist in an efficient way? i have a list of wallet addresses i need to add to a mapping

I can't think of anything more efficient than passing an array of addresses and looping through them to update your map.

Yup same

On Eth might be pretty costly

How does everyone else do it? Unless they're doing it through the front end only

Use a merkle tree or a set of signed coupons, super cheap

Never heard of that. Wait lemme google

Sounds interesting... can you link to any code examples of using a merkle tree/signed coupons in a solidity contract? I've never seen anything like that...

Super common for NFT mint whitelists, I've used several Merkle trees in my NFT contracts

This makes creating the whitelist cheaper but checking it more expensive tho, so that might depend on how he uses that and how big is the list of addresses to be whitelisted

Yeah, as long as you're using a list that is longer than like tens of items, it should make good gas sense

Once the list gets beyond like 150 or so, signed coupons become more efficient to check

I've never heard of signed coupons but you can find a merkle tree also on uniswap's github

Signed coupons is that centralized system where user signs a message and you check it offchain?

thanks, I'll check it out

Signed coupon just meaning a signed message that grants some permission

No, checking on chain

Message signed by a trusted wallet, details of the message and signature passed to contract and verified there with ecrecover

https://github.com/Uniswap/merkle-distributor

Yep, exactly

I can post a couple gists I wrote showing the typical usage of Merkle trees and signed coupons for mint whitelists

I'd appreciate it, thanks!

Ah right got confused, but yeah you need centralization as you need centralization cause you rely on the trusted wallet

💪🏻

Right but the list is centralized info anyways, same with Merkle tree, you have to trust the person who generated it offline

The important thing is they both get verified on chain

Good point

https://medium.com/@ItsCuzzo/using-merkle-trees-for-nft-whitelists-523b58ada3f9

you are the man! thanks dude

No prob, hit me up if you wanna see any of my NFT Merkle trees in the wild...I used one to accomplish verifying off chain trait data on chain, for combining NFTs by burning into a new NFT

That was for Monster Satoshibles

So, now I think the question is, does it use more gas to verify a signed message, or to verify a merkle proof? I would assume the former.

Depends on the size of the Merkle tree. Above about 150 items or so, Merkle tree verification is more expensive

Thanks again... you're a pro!

I wouldnt say pro, learning like everyone else! But I'm happy to help

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

Thanks

then check for token vesting

hi