Warning! Contract bytecode has been changed and doesn't match the verified one. Therefore, interaction with this smart contract may be risky.
- Contract name:
- Inventory
- Optimization enabled
- false
- Compiler version
- v0.8.28+commit.7893614a
- EVM Version
- Verified at
- 2026-09-18T22:34:42.329904Z
Constructor Arguments
0000000000000000000000000000000000000000000000000000000000000080000000000000000000000000c8cd89650f12b8b565ba89307e072c10579f6aa600000000000000000000000000000000000000000000000000000000000001600000000000000000000000000000000000000000000000000000000000000a4000000000000000000000000000000000000000000000000000000000000000060000000000000000000000000000000000000000000000004563918244f400000000000000000000000000000000000000000000000000008ac7230489e80000000000000000000000000000000000000000000000000001158e460913d00000000000000000000000000000000000000000000000000001a055690d9db800000000000000000000000000000000000000000000000000022b1c8c1227a00000000000000000000000000000000000000000000000000002b5e3af16b188000000000000000000000000000000000000000000000000000000000000000000462c636ebc011329aed1185a57e3c2a3c0af41f020b1cd510cdcd7559b14f403e20b601a78eebaaf22460cb2c9e33c6811a3d7126eb2dad36e4d7fd3eda6b701dc09e59986b50708b98794b19e9d13efcd08af4649f3ca7469155e638c88fe2a0306d6cb9fbff30eacff4325ac98c6fe142151a0673d0eb40a48be2ad8bf6ddd000e8b3722e66b02edd1391e2f81e0acc81189cb9fc9b96942ab86a6dd243288a159115d7905bf9212a9cf89e86b4df93602af044993286f6110858fe3df833b91c000820c1bcf1a6ad86437f4b0deb482ce60e828b60dc67e640948a496be16dbeb4d9d372767c4ececb3aad7b22f7e897c08a8a29530ec48e1377ef0b25453b7e5950697f5600665080a6fb0da0a5ec6e82e679b20ee1a5dae726d0562c26d4ba4512682729c90ca21a798ea956aa127156ea5439cabaeb23477a17cd7797f16b2757cf0db322f15109bea185468e63dfa1c5c5293e7d44a283282c9ad456a39f3256a52a3ce81a612872ef9330c62e921921d83c448c0deaa4fd4da39420f0570da435f9bc4fec5f1f29eabe9d41da4ab745653432d1362189d201a114d235da1a1c9e08252aaa4ded4db2605226f11a591c56a46878e2e931836c2cb29686878c0770978a573ee72cf6beef5a42f93f82810df5537700e40d2cc7c8cb8132a87529723537efce58f2312c1384b141c5046f2b8ff786f9273fbb9c95845afdaf22997229d9189c63c2ea7359e05a227166ab87f1a220f29b63d83022635b96277a7886bb4664869ca709bc68b460d5e5a89505d472a204cda2867cc855a02588fb76f682dda9cda3b059e3407110840ac4fe7e0fd45db0e65245a9e5d63c2a61e5a551d7925f71fb5e255c0d0686f82ef4b3d5181a02baa3c6d3c23712a8f48f114ca0d0c5a4332ba638823a7d84a947cb153eff8fa7cfc4c4fa2b493cf088ca1b905154ec07db8e853977382b33d58519268af30da405176e715f91f4a20f07cee311dbf4233f861ca9babb86c5b67333783d0b9cb29c6dd15c63b3d352830571496e9ab0cf3a26881e28124b1167a834164874f807af865798334ad87fce83593effd32f0f72925509621cebd0fd6f0a6337b0b44c6666470cc51d80f95a2840e50ec70ff4ecbc36861e12aea5cd8c734995059acae929a9459263f8f93905c7b163862c4fba8e2ac5ebe7ed171766ce01fd0e4d2ec4baae415668d384a75f1281bb340dba6193bf187288fda70ca10fa8b1b7be8aabf4c3f02999cd711ba4bfd57abfbb23911043c9dbe33b4b00c78b0b4f09032609fdb153a3a9db88d3932fb9926c155628eeda37c269aa131fc08430d4774b806bfec41c146fc552d6d4dd6a29027b74c355c79069c90553b0f026698ae2a4ffb30c5b8b076e382159c4ab67a8a09d44de85a9b2824622666d6003e70603f3d064e98cae5e0b8410de026afecab4f0642bccaba47fa9faef4d3db6d40ecb9cade98ba8fb63d6cacf6cbf4ae0028ba2ccbfa30a97810f1f45e3953c58ed623db3ed842d3548e4a0a9bb3318feb881806246188b8b8783ca6b6cde13fdf5115d1be1710ed6cb758f490ae2bbc25f46bf967c01b85f231be9a96a7e57e93767155973dfa89a2ca70447afdbac88755cae5546d82746dce0c3bbab2a60e0e6affafbc5716c66c684fe4f1eb2a25b932916798dd7bf2c4bf057cbbf97498a1269edf1b32d0b95203032ae9cdac9527b8095a6093fe7966eacf967dac7f42e52ab71db183649f000967a7713df1c017227eb11e6d3b1a19031bba3181e84e13c610f0d5c00d45d4b1513566ed900c55ea21751dbc05342bf116ca997cf48caa62ce6acc043ca721e5fa1a1753e01354b19b2dd07fb0b478eafa040cbba3ecc217adef1fb53e8a1d55e1b68874c9c4ba346e6773e63954b1d86e574d4337d2bf1c8c0beaa32a5fc0ad7272ad4f69008fd1843fcf0330923b3ededf4291305e946d95b8108e37633892eb180c604abbaf3f392860cdc3228af17bcbeebf8e77ea588c8ff88d992a9fac44eed9cd3c30d6083bbfc9a859482f3814b0f8eedd5c62e08dba95a9a3857a9625bb1d9396953624a6517752ad61efaa4e1fc7211f8c23012dad034098e7ad7be863317e396b744aeb16455dcba10378d7270b47b047d516b6a08c43f942d3f16d895b74b8e080ae0214819cc0678e5a9cfb56cf59c18c5e36df2193c7e76cacdb85fdc186bc16204044a59124cda107ded623b22057baff75281a0b48770a7f5fbf5559234da98cf9c787470344176c9a0525613062ce5a6c1611a7b43482dd87f510b361cd2d53eb0f41b1d54458ec76b6175c3106e65d646eb2dc3fb17d17a7c1f363b8cb3d41fd8b48a27567eecbc5fc05a19f057d4ea03efd717132686d4cd9945a558ec1e86e0f875356ef36c62db93e752f3b71b1c96171e8f6519247b6c251cc1491cb13ef3b6662b1cbb141f25fc9e6e135cd96fcd113b95011aa034459dba23130200f4aaea4385d45cb3c46887e563a1b60fed8ff4db342bdff1283f8c421de45da0cac4b27e9ba3f5889e3a94fa25d9d8b2bdcf879d23eacc6c4582ab1a9db1943c8f490b352607d059a2be2de6446f0e9be1d43f0bb581b5b2541b7329869afc02e9f7c2e8f5001328c6b94c00c6ae89b35512855907a9243899164b4b1f06802762fb242148ff069d92cd9aca7a31a82fcc30e5ae3faf6fd7488685f45e8761445f7aebd2e15e9c4baa1a7f3e4ef19922746679a3cbd72a748533d85976f15f69e9b7e6849d9209c748e27aa70a261402891b4a89bd70e6c4690172150e0221e691190263e736e76c09f6c8e70daeeb22921e72bd144e42a126225329f3f4b1489b80cdcf2919e0f6d77433fb6eb6e8ea7094ec7a61a5e678b9b651588eb9a58db0e8302dab6eea689062b8b0aa86d1806c32fa741e858638425b38dfe51048a58d46523fd13801c5e04d1fac4b0ea0750232ee7e2f322e4dca6568fac29046931a5f6931ae491307aaf0622fd232b0e02fc11d0d692fb1c93e06bea8fa1f8116bbba86ff74e1119e8c7de157ed7e405bfc593e278e2bd3bfb5cc40f2bb14acc3ceb21b4783502bc47142df2609bf2eb882b976da51527319bcf26c4de007d0f031ed9d4130778924f03a0b2562c8fa5192f4d7e034ae9987d563b179b00000000000000000000000000000000000000000000000000000000000000460000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000030000000000000000000000000000000000000000000000000000000000000005000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000300000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000030000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000300000000000000000000000000000000000000000000000000000000000000050000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000000500000000000000000000000000000000000000000000000000000000000000030000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000000300000000000000000000000000000000000000000000000000000000000000030000000000000000000000000000000000000000000000000000000000000005000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
Arg [0] (uint256[]) : [5000000000000000000, 10000000000000000000, 20000000000000000000, 30000000000000000000, 40000000000000000000, 50000000000000000000]
Arg [1] (address) : 0xc8cd89650f12b8b565ba89307e072c10579f6aa6
Arg [2] (bytes32[]) : [2c636ebc011329aed1185a57e3c2a3c0af41f020b1cd510cdcd7559b14f403e2, 0b601a78eebaaf22460cb2c9e33c6811a3d7126eb2dad36e4d7fd3eda6b701dc, 09e59986b50708b98794b19e9d13efcd08af4649f3ca7469155e638c88fe2a03, 06d6cb9fbff30eacff4325ac98c6fe142151a0673d0eb40a48be2ad8bf6ddd00, 0e8b3722e66b02edd1391e2f81e0acc81189cb9fc9b96942ab86a6dd243288a1, 59115d7905bf9212a9cf89e86b4df93602af044993286f6110858fe3df833b91, c000820c1bcf1a6ad86437f4b0deb482ce60e828b60dc67e640948a496be16db, eb4d9d372767c4ececb3aad7b22f7e897c08a8a29530ec48e1377ef0b25453b7, e5950697f5600665080a6fb0da0a5ec6e82e679b20ee1a5dae726d0562c26d4b, a4512682729c90ca21a798ea956aa127156ea5439cabaeb23477a17cd7797f16, b2757cf0db322f15109bea185468e63dfa1c5c5293e7d44a283282c9ad456a39, f3256a52a3ce81a612872ef9330c62e921921d83c448c0deaa4fd4da39420f05, 70da435f9bc4fec5f1f29eabe9d41da4ab745653432d1362189d201a114d235d, a1a1c9e08252aaa4ded4db2605226f11a591c56a46878e2e931836c2cb296868, 78c0770978a573ee72cf6beef5a42f93f82810df5537700e40d2cc7c8cb8132a, 87529723537efce58f2312c1384b141c5046f2b8ff786f9273fbb9c95845afda, f22997229d9189c63c2ea7359e05a227166ab87f1a220f29b63d83022635b962, 77a7886bb4664869ca709bc68b460d5e5a89505d472a204cda2867cc855a0258, 8fb76f682dda9cda3b059e3407110840ac4fe7e0fd45db0e65245a9e5d63c2a6, 1e5a551d7925f71fb5e255c0d0686f82ef4b3d5181a02baa3c6d3c23712a8f48, f114ca0d0c5a4332ba638823a7d84a947cb153eff8fa7cfc4c4fa2b493cf088c, a1b905154ec07db8e853977382b33d58519268af30da405176e715f91f4a20f0, 7cee311dbf4233f861ca9babb86c5b67333783d0b9cb29c6dd15c63b3d352830, 571496e9ab0cf3a26881e28124b1167a834164874f807af865798334ad87fce8, 3593effd32f0f72925509621cebd0fd6f0a6337b0b44c6666470cc51d80f95a2, 840e50ec70ff4ecbc36861e12aea5cd8c734995059acae929a9459263f8f9390, 5c7b163862c4fba8e2ac5ebe7ed171766ce01fd0e4d2ec4baae415668d384a75, f1281bb340dba6193bf187288fda70ca10fa8b1b7be8aabf4c3f02999cd711ba, 4bfd57abfbb23911043c9dbe33b4b00c78b0b4f09032609fdb153a3a9db88d39, 32fb9926c155628eeda37c269aa131fc08430d4774b806bfec41c146fc552d6d, 4dd6a29027b74c355c79069c90553b0f026698ae2a4ffb30c5b8b076e382159c, 4ab67a8a09d44de85a9b2824622666d6003e70603f3d064e98cae5e0b8410de0, 26afecab4f0642bccaba47fa9faef4d3db6d40ecb9cade98ba8fb63d6cacf6cb, f4ae0028ba2ccbfa30a97810f1f45e3953c58ed623db3ed842d3548e4a0a9bb3, 318feb881806246188b8b8783ca6b6cde13fdf5115d1be1710ed6cb758f490ae, 2bbc25f46bf967c01b85f231be9a96a7e57e93767155973dfa89a2ca70447afd, bac88755cae5546d82746dce0c3bbab2a60e0e6affafbc5716c66c684fe4f1eb, 2a25b932916798dd7bf2c4bf057cbbf97498a1269edf1b32d0b95203032ae9cd, ac9527b8095a6093fe7966eacf967dac7f42e52ab71db183649f000967a7713d, f1c017227eb11e6d3b1a19031bba3181e84e13c610f0d5c00d45d4b1513566ed, 900c55ea21751dbc05342bf116ca997cf48caa62ce6acc043ca721e5fa1a1753, e01354b19b2dd07fb0b478eafa040cbba3ecc217adef1fb53e8a1d55e1b68874, c9c4ba346e6773e63954b1d86e574d4337d2bf1c8c0beaa32a5fc0ad7272ad4f, 69008fd1843fcf0330923b3ededf4291305e946d95b8108e37633892eb180c60, 4abbaf3f392860cdc3228af17bcbeebf8e77ea588c8ff88d992a9fac44eed9cd, 3c30d6083bbfc9a859482f3814b0f8eedd5c62e08dba95a9a3857a9625bb1d93, 96953624a6517752ad61efaa4e1fc7211f8c23012dad034098e7ad7be863317e, 396b744aeb16455dcba10378d7270b47b047d516b6a08c43f942d3f16d895b74, b8e080ae0214819cc0678e5a9cfb56cf59c18c5e36df2193c7e76cacdb85fdc1, 86bc16204044a59124cda107ded623b22057baff75281a0b48770a7f5fbf5559, 234da98cf9c787470344176c9a0525613062ce5a6c1611a7b43482dd87f510b3, 61cd2d53eb0f41b1d54458ec76b6175c3106e65d646eb2dc3fb17d17a7c1f363, b8cb3d41fd8b48a27567eecbc5fc05a19f057d4ea03efd717132686d4cd9945a, 558ec1e86e0f875356ef36c62db93e752f3b71b1c96171e8f6519247b6c251cc, 1491cb13ef3b6662b1cbb141f25fc9e6e135cd96fcd113b95011aa034459dba2, 3130200f4aaea4385d45cb3c46887e563a1b60fed8ff4db342bdff1283f8c421, de45da0cac4b27e9ba3f5889e3a94fa25d9d8b2bdcf879d23eacc6c4582ab1a9, db1943c8f490b352607d059a2be2de6446f0e9be1d43f0bb581b5b2541b73298, 69afc02e9f7c2e8f5001328c6b94c00c6ae89b35512855907a9243899164b4b1, f06802762fb242148ff069d92cd9aca7a31a82fcc30e5ae3faf6fd7488685f45, e8761445f7aebd2e15e9c4baa1a7f3e4ef19922746679a3cbd72a748533d8597, 6f15f69e9b7e6849d9209c748e27aa70a261402891b4a89bd70e6c4690172150, e0221e691190263e736e76c09f6c8e70daeeb22921e72bd144e42a126225329f, 3f4b1489b80cdcf2919e0f6d77433fb6eb6e8ea7094ec7a61a5e678b9b651588, eb9a58db0e8302dab6eea689062b8b0aa86d1806c32fa741e858638425b38dfe, 51048a58d46523fd13801c5e04d1fac4b0ea0750232ee7e2f322e4dca6568fac, 29046931a5f6931ae491307aaf0622fd232b0e02fc11d0d692fb1c93e06bea8f, a1f8116bbba86ff74e1119e8c7de157ed7e405bfc593e278e2bd3bfb5cc40f2b, b14acc3ceb21b4783502bc47142df2609bf2eb882b976da51527319bcf26c4de, 007d0f031ed9d4130778924f03a0b2562c8fa5192f4d7e034ae9987d563b179b]
Arg [3] (uint8[]) : [2, 1, 3, 5, 2, 2, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 4, 3, 5, 3, 5, 3, 4, 2, 1, 2, 1, 1, 1, 1, 1, 3, 3, 3, 5, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
Inventory.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;
/// @title Inventory — who has what, on chain, and nothing else.
/// @notice Not a token. Not an NFT. No ERC standard, no ids to mint, no marketplace,
/// no royalties. Just a record: this address holds this many of this thing.
///
/// An item is identified by the **content hash of its own data** — the same
/// hash a `pblockz://` URI carries. So there is no registry to look an item up
/// in and no authority that decides what exists: if you can name the bytes,
/// you can name the item, and anybody can fetch those bytes and check that
/// they hash to it. The asset layer is the uploader; this is the save file.
///
/// @dev Stated plainly because it is the design rather than an oversight: this is
/// not scarcity. Anyone standing high enough on the ladder who knows a hash can
/// record that they hold that thing too. Copying data costs nothing, and
/// pretending otherwise would need a gatekeeper — the thing this project does
/// not have. What the ladder buys is a floor on who may claim what, not a
/// ceiling on how many exist. Real scarcity belongs in a different contract.
///
/// Holdings gate what you may claim, and the chain enforces it: `add` checks
/// `msg.sender.balance` against a fixed ladder. Doing that in a client would be
/// theatre -- anyone running their own would skip it.
///
/// Ownerless: no admin, no pause, no upgrade, no privileged address. The constructor
/// credits a founder with a stated list, once, before the contract can be called by
/// anybody -- and leaves no function behind that could do it again.
contract Inventory {
/// @notice How many of `item` `who` holds.
mapping(address => mapping(bytes32 => uint32)) public held;
/// Every item an address has ever held, so a client can enumerate without an
/// indexer. Entries are never removed -- a count of zero stays listed, which costs
/// one slot and saves the client from needing logs to find what you used to have.
mapping(address => bytes32[]) private _seen;
mapping(address => mapping(bytes32 => bool)) private _known;
/// @notice The data an item is made of. Because an item's id folds in the tier it
/// was claimed at, the id alone is not enough to go and fetch the bytes;
/// this is what turns one back into the other. Written once, by whoever
/// claims a thing first, and never changed.
mapping(bytes32 => bytes32) public dataOf;
event Changed(address indexed who, bytes32 indexed item, uint32 count);
error NotEnough();
error ZeroAmount();
error NoSuchTier();
error NotBigEnough();
error TooManySlots();
error StillHeld();
error NotListed();
/// A list has a ceiling, because `give` writes into somebody else's storage and an
/// unbounded array there is a griefing tool: claim junk at tier zero, hand it to a
/// stranger, repeat, and their list eventually costs more to read than any client
/// will spend. Bounded, and readable a page at a time.
uint256 public constant MAX_SLOTS = 1024;
/// Of which this many may be opened by *other people's* gifts. Kept separate so
/// that filling somebody's list with rubbish can never stop them adding their own
/// things -- the worst it does is use up the space reserved for presents.
uint256 public constant MAX_GIFT_SLOTS = 128;
mapping(address => uint256) public giftSlots;
/// Holdings, in wei, for each rung. Set once at construction and never again:
/// there is nobody who could change them.
uint256[] public thresholds;
/// @param rungs Holdings, in wei, for each rung. Fixed forever at this moment.
/// @param founder Who the town belongs to, credited with `seedItems` below.
/// @param seedItems Data hashes to credit the founder with, one of each.
/// @param seedTiers The tier each of them is claimed at, in the same order.
///
/// @dev The seed is the one privilege in this contract and it lasts one transaction.
/// There is no function that does this -- not a restricted one, not an ownable one,
/// not one behind a flag. It happens inside the constructor, before an address
/// exists for anybody to call, and after it returns there is no path to `_credit`
/// that does not go through `add` and its balance check, or `give` and somebody
/// actually parting with a thing they hold.
///
/// That is a different claim from "trust the deployer". Anyone can read the
/// deployment transaction and see exactly what was seeded and to whom, and anyone
/// can read this constructor and see there is no second helping. A demo whose author
/// cannot show the town wearing its own clothes is a poor demo; a contract with a
/// mint function for the author is a poor contract. This is neither.
///
/// The tier is folded into the id as it is everywhere else, so a seeded item is the
/// SAME id as one somebody earns by standing on that rung -- not a special edition,
/// not a variant. The founder is holding the thing you can hold.
constructor(
uint256[] memory rungs,
address founder,
bytes32[] memory seedItems,
uint8[] memory seedTiers
) {
thresholds = rungs;
if (seedItems.length != seedTiers.length) revert NotEnough();
for (uint256 i = 0; i < seedItems.length; i++) {
if (seedTiers[i] >= rungs.length) revert NoSuchTier();
bytes32 item = itemId(seedItems[i], seedTiers[i]);
if (dataOf[item] == bytes32(0)) dataOf[item] = seedItems[i];
_credit(founder, item, 1);
}
}
/// @notice Record that you hold one more of the thing described by `dataHash`,
/// claimed at `tier`.
///
/// The tier is part of the item's identity, not a field beside it:
/// `item = keccak256(dataHash, tier)`. That is what makes the gate real.
/// A modified client can call this with any tier it likes, but claiming a
/// lower one to duck the threshold produces a *different* id, which is not
/// the id the game knows that thing by -- so it buys you a record of
/// something nobody recognises. There is no honest way round it and no
/// gatekeeper deciding: the chain checks your balance itself.
uint8 public constant RECORD_TIER = 255; // `keep`: a record, on no rung of the ladder
function add(bytes32 dataHash, uint8 tier) external {
if (tier >= thresholds.length) revert NoSuchTier();
// msg.sender.balance is native PLS, read by the chain at the moment of the
// call. Nothing is taken and nothing is locked -- spend it and you fall back
// down the ladder, which is the point of measuring holdings rather than spend.
if (msg.sender.balance < thresholds[tier]) revert NotBigEnough();
bytes32 item = itemId(dataHash, tier);
if (dataOf[item] == bytes32(0)) dataOf[item] = dataHash;
_credit(msg.sender, item, 1);
}
/// @notice Keep a record of your own -- an outfit, say: a list of things you already hold.
/// Nothing is claimed, so nothing is gated: the ladder is what standing on a rung
/// buys, and a note about what you wear is not bought. Kept at RECORD_TIER, which
/// `add` can never produce (it is past every rung), so a kept hash is never the id
/// of anything on a shelf and keeping one cannot be a way round the gate.
function keep(bytes32 dataHash) external {
bytes32 item = itemId(dataHash, RECORD_TIER);
if (dataOf[item] == bytes32(0)) dataOf[item] = dataHash;
_credit(msg.sender, item, 1);
}
/// @notice The id a piece of data has when claimed at a given tier.
function itemId(bytes32 dataHash, uint8 tier) public pure returns (bytes32) {
return keccak256(abi.encodePacked(dataHash, tier));
}
/// @notice What each rung of the ladder costs to stand on, in wei of native PLS.
function ladder() external view returns (uint256[] memory) {
return thresholds;
}
/// @notice Give some of yours to someone else. Yours goes down, theirs goes up;
/// nothing is created or destroyed.
function give(address to, bytes32 item, uint32 amount) external {
_debit(msg.sender, item, amount);
if (to != msg.sender && !_known[to][item]) {
if (giftSlots[to] >= MAX_GIFT_SLOTS) revert TooManySlots();
giftSlots[to]++;
}
_credit(to, item, amount);
}
/// @notice Drop an entry you no longer hold out of your own list, so a list filled
/// with somebody else's rubbish can be cleaned up. Only you can call this,
/// and only for something whose count is already zero.
function forget(bytes32 item) external {
if (held[msg.sender][item] != 0) revert StillHeld();
if (!_known[msg.sender][item]) revert NotListed();
bytes32[] storage list = _seen[msg.sender];
for (uint256 i = 0; i < list.length; i++) {
if (list[i] == item) {
list[i] = list[list.length - 1];
list.pop();
break;
}
}
_known[msg.sender][item] = false;
if (giftSlots[msg.sender] > 0) giftSlots[msg.sender]--;
emit Changed(msg.sender, item, 0);
}
/// @notice Throw some away. There is no way for anyone else to do this to you.
function drop(bytes32 item, uint32 amount) external {
_debit(msg.sender, item, amount);
}
// ---- views ----------------------------------------------------------------
/// @notice Everything `who` has ever held, and how many of each they hold now.
/// Counts of zero are included; the caller decides whether to show them.
/// @param offset where to start, @param limit how many at most. A page, because a
/// list somebody else can grow should never be a single unbounded return.
function inventoryOf(address who, uint256 offset, uint256 limit)
external view returns (bytes32[] memory items, uint32[] memory counts, bytes32[] memory data)
{
bytes32[] storage all = _seen[who];
uint256 n = offset >= all.length ? 0 : all.length - offset;
if (n > limit) n = limit;
items = new bytes32[](n);
counts = new uint32[](n);
data = new bytes32[](n);
for (uint256 i = 0; i < n; i++) {
items[i] = all[offset + i];
counts[i] = held[who][items[i]];
data[i] = dataOf[items[i]];
}
}
/// @notice How many distinct items `who` has ever held.
function slotsOf(address who) external view returns (uint256) {
return _seen[who].length;
}
// ---- internals ------------------------------------------------------------
function _credit(address who, bytes32 item, uint32 amount) internal {
if (amount == 0) revert ZeroAmount();
if (!_known[who][item]) {
if (_seen[who].length >= MAX_SLOTS) revert TooManySlots();
_known[who][item] = true;
_seen[who].push(item);
}
uint32 next = held[who][item] + amount; // 0.8 reverts on overflow
held[who][item] = next;
emit Changed(who, item, next);
}
function _debit(address who, bytes32 item, uint32 amount) internal {
if (amount == 0) revert ZeroAmount();
uint32 have = held[who][item];
if (have < amount) revert NotEnough();
uint32 next = have - amount;
held[who][item] = next;
emit Changed(who, item, next);
}
}
Compiler Settings
{"outputSelection":{"*":{"*":["abi","evm.bytecode","evm.deployedBytecode","metadata"]}},"optimizer":{"runs":200,"enabled":true},"evmVersion":"shanghai"}
Contract ABI
[{"type":"constructor","stateMutability":"nonpayable","inputs":[{"type":"uint256[]","name":"rungs","internalType":"uint256[]"},{"type":"address","name":"founder","internalType":"address"},{"type":"bytes32[]","name":"seedItems","internalType":"bytes32[]"},{"type":"uint8[]","name":"seedTiers","internalType":"uint8[]"}]},{"type":"error","name":"NoSuchTier","inputs":[]},{"type":"error","name":"NotBigEnough","inputs":[]},{"type":"error","name":"NotEnough","inputs":[]},{"type":"error","name":"NotListed","inputs":[]},{"type":"error","name":"StillHeld","inputs":[]},{"type":"error","name":"TooManySlots","inputs":[]},{"type":"error","name":"ZeroAmount","inputs":[]},{"type":"event","name":"Changed","inputs":[{"type":"address","name":"who","internalType":"address","indexed":true},{"type":"bytes32","name":"item","internalType":"bytes32","indexed":true},{"type":"uint32","name":"count","internalType":"uint32","indexed":false}],"anonymous":false},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"MAX_GIFT_SLOTS","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"MAX_SLOTS","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint8","name":"","internalType":"uint8"}],"name":"RECORD_TIER","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"add","inputs":[{"type":"bytes32","name":"dataHash","internalType":"bytes32"},{"type":"uint8","name":"tier","internalType":"uint8"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"bytes32","name":"","internalType":"bytes32"}],"name":"dataOf","inputs":[{"type":"bytes32","name":"","internalType":"bytes32"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"drop","inputs":[{"type":"bytes32","name":"item","internalType":"bytes32"},{"type":"uint32","name":"amount","internalType":"uint32"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"forget","inputs":[{"type":"bytes32","name":"item","internalType":"bytes32"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"giftSlots","inputs":[{"type":"address","name":"","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"give","inputs":[{"type":"address","name":"to","internalType":"address"},{"type":"bytes32","name":"item","internalType":"bytes32"},{"type":"uint32","name":"amount","internalType":"uint32"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint32","name":"","internalType":"uint32"}],"name":"held","inputs":[{"type":"address","name":"","internalType":"address"},{"type":"bytes32","name":"","internalType":"bytes32"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"bytes32[]","name":"items","internalType":"bytes32[]"},{"type":"uint32[]","name":"counts","internalType":"uint32[]"},{"type":"bytes32[]","name":"data","internalType":"bytes32[]"}],"name":"inventoryOf","inputs":[{"type":"address","name":"who","internalType":"address"},{"type":"uint256","name":"offset","internalType":"uint256"},{"type":"uint256","name":"limit","internalType":"uint256"}]},{"type":"function","stateMutability":"pure","outputs":[{"type":"bytes32","name":"","internalType":"bytes32"}],"name":"itemId","inputs":[{"type":"bytes32","name":"dataHash","internalType":"bytes32"},{"type":"uint8","name":"tier","internalType":"uint8"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"keep","inputs":[{"type":"bytes32","name":"dataHash","internalType":"bytes32"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256[]","name":"","internalType":"uint256[]"}],"name":"ladder","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"slotsOf","inputs":[{"type":"address","name":"who","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"thresholds","inputs":[{"type":"uint256","name":"","internalType":"uint256"}]}]
Contract Creation Code
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