# How to Make Inscription On Starknet We know that BTC's inscription carries data through utxo, and EVM's inscription carries data through calldata in ETH transfer, and then uses an offline indexer to identify user operations and balance information. But these don't seem to work in Starknet. Because Starknet is the layer 2 of ETH, and ETH is a contract on Starknet, transfers require operating the contract and cannot carry data. As a result, many people use smart contracts to store json data and try to use hot spots to charge fees. The transaction fee is high and you have to pay additional fees, which loses the meaning of the inscription. If we want to implement the inscription protocol on Starknet, how should we do it? First of all, only smart contracts can be used because there are no EOA accounts on Starknet; Secondly, the smart contract must be extremely simple and cannot perform too many calculations or storage, so as to minimize on-chain operation fees and put complex calculations and storage off-chain. Therefore, we designed the following contract model: ```javascript #[derive(Drop, starknet::Event)] struct Ins { ins: Array, from: starknet::ContractAddress, to: starknet::ContractAddress } fn inscription(ref self: ContractState, ins: Array, to: starknet::ContractAddress){ self.emit(Ins { ins: ins, from: starknet::get_caller_address(), to: to }); } ``` Yes, it has only one event (the cost of throwing an event is extremely low, which is convenient for large-scale adoption), which is used to throw out the user's inscription information, operation address, and to address for offline indexers to retrieve and calculate. Contract on starknet mainnet: 0x0600386e4cd85d7bb925892b61b14ff019d3dd8e31432f4b97c8ee2462e0375d About the inscription protocol, please refer to the SNSC-20 description. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://snsc-20.gitbook.io/snsc-20-standard/about-src-20/how-to-make-inscription-on-starknet.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.