{ "contractName": "MockERC20", "abi": [ { "inputs": [ { "internalType": "string", "name": "name", "type": "string" }, { "internalType": "string", "name": "symbol", "type": "string" }, { "internalType": "address", "name": "initialAccount", "type": "address" }, { "internalType": "uint256", "name": "initialBalance", "type": "uint256" } ], "stateMutability": "payable", "type": "constructor" }, { "anonymous": false, "inputs": [ { "indexed": true, "internalType": "address", "name": "owner", "type": "address" }, { "indexed": true, "internalType": "address", "name": "spender", "type": "address" }, { "indexed": false, "internalType": "uint256", "name": "value", "type": "uint256" } ], "name": "Approval", "type": "event" }, { "anonymous": false, "inputs": [ { "indexed": true, "internalType": "address", "name": "from", "type": "address" }, { "indexed": true, "internalType": "address", "name": "to", "type": "address" }, { "indexed": false, "internalType": "uint256", "name": "value", "type": "uint256" } ], "name": "Transfer", "type": "event" }, { "inputs": [ { "internalType": "address", "name": "owner", "type": "address" }, { "internalType": "address", "name": "spender", "type": "address" } ], "name": "allowance", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "stateMutability": "view", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "spender", "type": "address" }, { "internalType": "uint256", "name": "amount", "type": "uint256" } ], "name": "approve", "outputs": [ { "internalType": "bool", "name": "", "type": "bool" } ], "stateMutability": "nonpayable", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "account", "type": "address" } ], "name": "balanceOf", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "stateMutability": "view", "type": "function" }, { "inputs": [], "name": "decimals", "outputs": [ { "internalType": "uint8", "name": "", "type": "uint8" } ], "stateMutability": "view", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "spender", "type": "address" }, { "internalType": "uint256", "name": "subtractedValue", "type": "uint256" } ], "name": "decreaseAllowance", "outputs": [ { "internalType": "bool", "name": "", "type": "bool" } ], "stateMutability": "nonpayable", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "spender", "type": "address" }, { "internalType": "uint256", "name": "addedValue", "type": "uint256" } ], "name": "increaseAllowance", "outputs": [ { "internalType": "bool", "name": "", "type": "bool" } ], "stateMutability": "nonpayable", "type": "function" }, { "inputs": [], "name": "name", "outputs": [ { "internalType": "string", "name": "", "type": "string" } ], "stateMutability": "view", "type": "function" }, { "inputs": [], "name": "symbol", "outputs": [ { "internalType": "string", "name": "", "type": "string" } ], "stateMutability": "view", "type": "function" }, { "inputs": [], "name": "totalSupply", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "stateMutability": "view", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "recipient", "type": "address" }, { "internalType": "uint256", "name": "amount", "type": "uint256" } ], "name": "transfer", "outputs": [ { "internalType": "bool", "name": "", "type": "bool" } ], "stateMutability": "nonpayable", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "sender", "type": "address" }, { "internalType": "address", "name": "recipient", "type": "address" }, { "internalType": "uint256", "name": "amount", "type": "uint256" } ], "name": "transferFrom", "outputs": [ { "internalType": "bool", "name": "", "type": "bool" } ], "stateMutability": "nonpayable", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "account", "type": "address" }, { "internalType": "uint256", "name": "amount", "type": "uint256" } ], "name": "mint", "outputs": [], "stateMutability": "nonpayable", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "account", "type": "address" }, { "internalType": "uint256", "name": "amount", "type": "uint256" } ], "name": "burn", "outputs": [], "stateMutability": "nonpayable", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "from", "type": "address" }, { "internalType": "address", "name": "to", "type": "address" }, { "internalType": "uint256", "name": "value", "type": "uint256" } ], "name": "transferInternal", "outputs": [], "stateMutability": "nonpayable", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "owner", "type": "address" }, { "internalType": "address", "name": "spender", "type": "address" }, { "internalType": "uint256", "name": "value", "type": "uint256" } ], "name": "approveInternal", "outputs": [], "stateMutability": "nonpayable", "type": "function" } ], "metadata": "{\"compiler\":{\"version\":\"0.6.12+commit.27d51765\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"inputs\":[{\"internalType\":\"string\",\"name\":\"name\",\"type\":\"string\"},{\"internalType\":\"string\",\"name\":\"symbol\",\"type\":\"string\"},{\"internalType\":\"address\",\"name\":\"initialAccount\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"initialBalance\",\"type\":\"uint256\"}],\"stateMutability\":\"payable\",\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Approval\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Transfer\",\"type\":\"event\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"}],\"name\":\"allowance\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"approve\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"approveInternal\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"account\",\"type\":\"address\"}],\"name\":\"balanceOf\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"account\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"burn\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"decimals\",\"outputs\":[{\"internalType\":\"uint8\",\"name\":\"\",\"type\":\"uint8\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"subtractedValue\",\"type\":\"uint256\"}],\"name\":\"decreaseAllowance\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"addedValue\",\"type\":\"uint256\"}],\"name\":\"increaseAllowance\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"account\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"mint\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"name\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"symbol\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"totalSupply\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"recipient\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"transfer\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"sender\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"recipient\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"transferFrom\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\"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{IERC20-allowance}.\"},\"approve(address,uint256)\":{\"details\":\"See {IERC20-approve}. Requirements: - `spender` cannot be the zero address.\"},\"balanceOf(address)\":{\"details\":\"See {IERC20-balanceOf}.\"},\"decimals()\":{\"details\":\"Returns the number of decimals used to get its user representation. For example, if `decimals` equals `2`, a balance of `505` tokens should be displayed to a user as `5,05` (`505 / 10 ** 2`). Tokens usually opt for a value of 18, imitating the relationship between Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is called. NOTE: This information is only used for _display_ purposes: it in no way affects any of the arithmetic of the contract, including {IERC20-balanceOf} and {IERC20-transfer}.\"},\"decreaseAllowance(address,uint256)\":{\"details\":\"Atomically decreases the allowance granted to `spender` by the caller. This is an alternative to {approve} that can be used as a mitigation for problems described in {IERC20-approve}. Emits an {Approval} event indicating the updated allowance. Requirements: - `spender` cannot be the zero address. - `spender` must have allowance for the caller of at least `subtractedValue`.\"},\"increaseAllowance(address,uint256)\":{\"details\":\"Atomically increases the allowance granted to `spender` by the caller. This is an alternative to {approve} that can be used as a mitigation for problems described in {IERC20-approve}. Emits an {Approval} event indicating the updated allowance. Requirements: - `spender` cannot be the zero address.\"},\"name()\":{\"details\":\"Returns the name of the token.\"},\"symbol()\":{\"details\":\"Returns the symbol of the token, usually a shorter version of the name.\"},\"totalSupply()\":{\"details\":\"See {IERC20-totalSupply}.\"},\"transfer(address,uint256)\":{\"details\":\"See {IERC20-transfer}. Requirements: - `recipient` cannot be the zero address. - the caller must have a balance of at least `amount`.\"},\"transferFrom(address,address,uint256)\":{\"details\":\"See {IERC20-transferFrom}. Emits an {Approval} event indicating the updated allowance. This is not required by the EIP. See the note at the beginning of {ERC20}. Requirements: - `sender` and `recipient` cannot be the zero address. - `sender` must have a balance of at least `amount`. - the caller must have allowance for ``sender``'s tokens of at least `amount`.\"}},\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{},\"version\":1}},\"settings\":{\"compilationTarget\":{\"/Users/naz_dou/Documents/Projects/IovLabs/rif-marketplace-storage/contracts/tests/MockERC20.sol\":\"MockERC20\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":200},\"remappings\":[]},\"sources\":{\"/Users/naz_dou/Documents/Projects/IovLabs/rif-marketplace-storage/contracts/tests/MockERC20.sol\":{\"keccak256\":\"0x8e2edb1b359ba693d540b0cc091d8fa9ca24ef44bb3d32b056e1898801cce9fb\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://b90c137648ce1258d7aeb11ba7c6ac9aad2e15645af0c93e5ba9bd3cf21e55e8\",\"dweb:/ipfs/QmaavqTJ7bDHavtzmDMGPq19woUE43ZZaX7NzyQ9FWWLo7\"]},\"@openzeppelin/contracts/GSN/Context.sol\":{\"keccak256\":\"0x8d3cb350f04ff49cfb10aef08d87f19dcbaecc8027b0bed12f3275cd12f38cf0\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://ded47ec7c96750f9bd04bbbc84f659992d4ba901cb7b532a52cd468272cf378f\",\"dweb:/ipfs/QmfBrGtQP7rZEqEg6Wz6jh2N2Kukpj1z5v3CGWmAqrzm96\"]},\"@openzeppelin/contracts/math/SafeMath.sol\":{\"keccak256\":\"0x3b21f2c8d626de3b9925ae33e972d8bf5c8b1bffb3f4ee94daeed7d0679036e6\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://7f8d45329fecbf0836ad7543330c3ecd0f8d0ffa42d4016278c3eb2215fdcdfe\",\"dweb:/ipfs/QmXWLT7GcnHtA5NiD6MFi2CV3EWJY4wv5mLNnypqYDrxL3\"]},\"@openzeppelin/contracts/token/ERC20/ERC20.sol\":{\"keccak256\":\"0xcbd85c86627a47fd939f1f4ee3ba626575ff2a182e1804b29f5136394449b538\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://53c6a80c519bb9356aad28efa9a1ec31603860eb759d2dc57f545fcae1dd1aca\",\"dweb:/ipfs/QmfRS6TtMNUHhvgLHXK21qKNnpn2S7g2Yd1fKaHKyFiJsR\"]},\"@openzeppelin/contracts/token/ERC20/IERC20.sol\":{\"keccak256\":\"0x5f02220344881ce43204ae4a6281145a67bc52c2bb1290a791857df3d19d78f5\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://24427744bd3e6cb73c17010119af12a318289c0253a4d9acb8576c9fb3797b08\",\"dweb:/ipfs/QmTLDqpKRBuxGxRAmjgXt9AkXyACW3MtKzi7PYjm5iMfGC\"]}},\"version\":1}", 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"source": "// SPDX-License-Identifier: MIT\npragma solidity ^0.6.12;\nimport \"@openzeppelin/contracts/token/ERC20/ERC20.sol\";\n\n// mock class using ERC20\ncontract MockERC20 is ERC20 {\n constructor(\n string memory name,\n string memory symbol,\n address initialAccount,\n uint256 initialBalance\n ) public payable ERC20(name, symbol) {\n _mint(initialAccount, initialBalance);\n }\n\n function mint(address account, uint256 amount) external {\n _mint(account, amount);\n }\n\n function burn(address account, uint256 amount) external {\n _burn(account, amount);\n }\n\n function transferInternal(\n address from,\n address to,\n uint256 value\n ) external {\n _transfer(from, to, value);\n }\n\n function approveInternal(\n address owner,\n address spender,\n uint256 value\n ) external {\n _approve(owner, spender, value);\n }\n}\n", "sourcePath": "/Users/naz_dou/Documents/Projects/IovLabs/rif-marketplace-storage/contracts/tests/MockERC20.sol", "ast": { "absolutePath": "/Users/naz_dou/Documents/Projects/IovLabs/rif-marketplace-storage/contracts/tests/MockERC20.sol", "exportedSymbols": { "MockERC20": [ 1995 ] }, "id": 1996, "license": "MIT", "nodeType": "SourceUnit", "nodes": [ { "id": 1912, "literals": [ "solidity", "^", "0.6", ".12" ], "nodeType": "PragmaDirective", "src": "32:24:3" }, { "absolutePath": "@openzeppelin/contracts/token/ERC20/ERC20.sol", "file": "@openzeppelin/contracts/token/ERC20/ERC20.sol", "id": 1913, "nodeType": "ImportDirective", "scope": 1996, "sourceUnit": 3256, "src": "57:55:3", "symbolAliases": [], "unitAlias": "" }, { "abstract": false, "baseContracts": [ { "arguments": null, "baseName": { "contractScope": null, "id": 1914, "name": "ERC20", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 3255, "src": "162:5:3", "typeDescriptions": { "typeIdentifier": "t_contract$_ERC20_$3255", "typeString": "contract ERC20" } }, "id": 1915, "nodeType": "InheritanceSpecifier", "src": "162:5:3" } ], "contractDependencies": [ 2447, 3255, 3333 ], "contractKind": "contract", "documentation": null, "fullyImplemented": true, "id": 1995, "linearizedBaseContracts": [ 1995, 3255, 3333, 2447 ], "name": "MockERC20", "nodeType": "ContractDefinition", "nodes": [ { "body": { "id": 1935, "nodeType": "Block", "src": "349:54:3", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 1931, "name": "initialAccount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 1921, "src": "365:14:3", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 1932, "name": "initialBalance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 1923, "src": "381:14:3", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 1930, "name": "_mint", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3131, "src": "359:5:3", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,uint256)" } }, "id": 1933, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "359:37:3", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 1934, "nodeType": "ExpressionStatement", "src": "359:37:3" } ] }, "documentation": null, "id": 1936, "implemented": true, "kind": "constructor", "modifiers": [ { "arguments": [ { "argumentTypes": null, "id": 1926, "name": "name", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 1917, "src": "335:4:3", "typeDescriptions": { "typeIdentifier": 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false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string" }, "typeName": { "id": 1916, "name": "string", "nodeType": "ElementaryTypeName", "src": "195:6:3", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 1919, "mutability": "mutable", "name": "symbol", "nodeType": "VariableDeclaration", "overrides": null, "scope": 1936, "src": "223:20:3", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string" }, "typeName": { "id": 1918, "name": "string", "nodeType": "ElementaryTypeName", "src": "223:6:3", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 1921, "mutability": "mutable", "name": "initialAccount", "nodeType": 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"internal" } ], "src": "790:77:3" }, "returnParameters": { "id": 1986, "nodeType": "ParameterList", "parameters": [], "src": "877:0:3" }, "scope": 1995, "src": "766:159:3", "stateMutability": "nonpayable", "virtual": false, "visibility": "external" } ], "scope": 1996, "src": "140:787:3" } ], "src": "32:896:3" }, "compiler": { "name": "solc", "version": "0.6.12+commit.27d51765.Emscripten.clang" }, "networks": {}, "schemaVersion": "3.3.2", "updatedAt": "2021-03-04T12:24:19.844Z", "devdoc": { "kind": "dev", "methods": { "allowance(address,address)": { "details": "See {IERC20-allowance}." }, "approve(address,uint256)": { "details": "See {IERC20-approve}. Requirements: - `spender` cannot be the zero address." }, "balanceOf(address)": { "details": "See {IERC20-balanceOf}." }, "decimals()": { "details": "Returns the number of decimals used to get its user representation. For example, if `decimals` equals `2`, a balance of `505` tokens should be displayed to a user as `5,05` (`505 / 10 ** 2`). Tokens usually opt for a value of 18, imitating the relationship between Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is called. NOTE: This information is only used for _display_ purposes: it in no way affects any of the arithmetic of the contract, including {IERC20-balanceOf} and {IERC20-transfer}." }, "decreaseAllowance(address,uint256)": { "details": "Atomically decreases the allowance granted to `spender` by the caller. This is an alternative to {approve} that can be used as a mitigation for problems described in {IERC20-approve}. Emits an {Approval} event indicating the updated allowance. Requirements: - `spender` cannot be the zero address. - `spender` must have allowance for the caller of at least `subtractedValue`." }, "increaseAllowance(address,uint256)": { "details": "Atomically increases the allowance granted to `spender` by the caller. This is an alternative to {approve} that can be used as a mitigation for problems described in {IERC20-approve}. Emits an {Approval} event indicating the updated allowance. Requirements: - `spender` cannot be the zero address." }, "name()": { "details": "Returns the name of the token." }, "symbol()": { "details": "Returns the symbol of the token, usually a shorter version of the name." }, "totalSupply()": { "details": "See {IERC20-totalSupply}." }, "transfer(address,uint256)": { "details": "See {IERC20-transfer}. Requirements: - `recipient` cannot be the zero address. - the caller must have a balance of at least `amount`." }, "transferFrom(address,address,uint256)": { "details": "See {IERC20-transferFrom}. Emits an {Approval} event indicating the updated allowance. This is not required by the EIP. See the note at the beginning of {ERC20}. Requirements: - `sender` and `recipient` cannot be the zero address. - `sender` must have a balance of at least `amount`. - the caller must have allowance for ``sender``'s tokens of at least `amount`." } }, "version": 1 }, "userdoc": { "kind": "user", "methods": {}, "version": 1 } }