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This is the mint function I write in my contract. Each non-fungible token here represents a mobile device with a unique device ID and the device belongs to a certain owner. So apart from the token id, it contains owner's information including his/her ID, wallet address and ipfs hash value of user identity profile. The token does not contain any metadata.

First part of the function is a for loop mapping owner's information to the token; Second is the mintBatch function that actually mints multiple non-fungible tokens to one address.

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I am wondering if there is any upper limit on the number of NFTs I can mint using this function.

For instance, if I mint 100,000 such NFTs to an address, would the miner be unwilling to package this transaction into a new block because the size of the transaction is too big that it would slow down the whole mining process.

And would the EVM be able to handle such a large amount of state changes in a short time?

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The rule of thumb seems to be up to 20 NFTs if you want to be sure it fits into a block the traditional way.

Otherwise you might want to look into Ghost minting and LazyArray techniques pioneered by William Entriken in AreaWorld project:

https://github.com/AreaWorld/ethereum-contracts

https://etherscan.io/address/0xf85c6320cc60DEC45Af1f7cE82B13dd24D539690#code#F5#L58

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  • Thank you sir, I will look up the project you mentioned. And by the way, I would like to ask if there's a limit on the number of erc20 tokens that can be minted in one transaction? Dec 10, 2021 at 8:43
  • I don't think there is a limit for fungible tokens as you don't have to loop through a cycle. Dec 10, 2021 at 23:10
  • Ok thank you sir Dec 11, 2021 at 9:58
  • :) you're welcome, please feel free to mark the answer as correct if you think it is Dec 13, 2021 at 13:24
  • Hi Taras Filatov, not to be rude but where do you find this 20 NFT, rule of thumb?
    – Lonewarp
    Jun 28 at 8:52

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