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Problem is minting of tokens in random order. I would like to hear more about drawbacks of these approaches:

Having:

  • 10.000 NFT collectibles
  • amongst them there are rare ones
  • images are clearly showing this rarity
  • metadata + images are revealed after sell-out

1/ Effortless way is to save metadata+images to ipfs in randomized order [3856, 17, 6668, 735..] but with sorted ids as 1 .. 10000. I don't like the fact that operators know exact location of rare ones, and that makes me uneasy.

2/ Mint starts in order 1 .. 10000, metadata is not uploaded yet. After sell-out, contract method using ChainLink VRF is called, and it generate random numbers which assign rarity to tokens with these ids. Then metadata is uploaded to ipfs, then reveal. I don't like that ipfs CID update, though.

3/ Also ChainLink VRF, but in every call of mint function. Might get expensive with pricing = 2 LINK / token.

I understand that no solution is perfect, but is there any better way to go when minting tokens in random order?

 

EDIT: I ended up using slightly different solution, described it here: repository

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You can go for option 3, but use a single call to chainlink and then expand the random number for each token number. Thanks how I did it in the Wavelength contract here: https://etherscan.io/address/0x68930072647a0d79e601d5ee3914833ae9148247#code

Relevant line is 2423. Hope that helps.

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  • That way the numbers are not predictable by users or the project team. I used the plant seed function after it sold out and it saved a ton of link.
    – Fatlion
    Feb 17, 2022 at 11:54
  • Exactly the same thing I ended up with. Nice thinking, although had some problem explaining people why have I done this because they even couldn't understand they might be bad players :D
    – wtdmn
    Feb 19, 2022 at 23:59
  • Hi, @Fatlion, I've been reviewing your contract and the getSeed function in line 2423 but I don't understand how it is related to minting each token. I see that plantSeed starts the Chainlink VRF process by calling requestRandomness and the corresponding fulfillRandomness sets the state variable baseSeed to the random number returned by Chainlink but I can't see how all the pieces fit together. Is this supposed to be a mint in two steps with users minting first and some time later the owner triggering a reveal by calling a function? Could you please add some more details?
    – Mentakatz
    Aug 7, 2022 at 19:46

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