> ## Documentation Index > Fetch the complete documentation index at: https://base-a060aa97-docs-sync-code-change-6bb10a4.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # IB20 reference > Generated B20 reference for IB20 functions, events, and errors. ## Functions | Function | Selector | Summary | | ------------------------------------------------------------------------------------------------------ | ------------ | ------------------------------------------------------------------------------------------------ | | [`DEFAULT_ADMIN_ROLE`](/base-chain/specs/reference/b20/interfaces/IB20/DEFAULT_ADMIN_ROLE) | `0xa217fddf` | The default top-level admin role (`bytes32(0)`). Required to call `grantRole`, `revokeRole`, | | [`MINT_ROLE`](/base-chain/specs/reference/b20/interfaces/IB20/MINT_ROLE) | `0xe9a9c850` | Required to call `mint` and `mintWithMemo`. | | [`BURN_ROLE`](/base-chain/specs/reference/b20/interfaces/IB20/BURN_ROLE) | `0xb930908f` | Required to call `burn` and `burnWithMemo`. | | [`BURN_BLOCKED_ROLE`](/base-chain/specs/reference/b20/interfaces/IB20/BURN_BLOCKED_ROLE) | `0x32ad9be8` | Required to call the deprecated `burnBlocked` (retained for | | [`SEIZE_ROLE`](/base-chain/specs/reference/b20/interfaces/IB20/SEIZE_ROLE) | `0x3c7e9ba5` | Required to call `seizeWithMemo`. | | [`PAUSE_ROLE`](/base-chain/specs/reference/b20/interfaces/IB20/PAUSE_ROLE) | `0x389ed267` | Required to call `pause`. | | [`UNPAUSE_ROLE`](/base-chain/specs/reference/b20/interfaces/IB20/UNPAUSE_ROLE) | `0x309756fb` | Required to call `unpause`. | | [`METADATA_ROLE`](/base-chain/specs/reference/b20/interfaces/IB20/METADATA_ROLE) | `0x38841782` | Required to call `updateName`, `updateSymbol`, and `updateContractURI`. | | [`TRANSFER_SENDER_POLICY`](/base-chain/specs/reference/b20/interfaces/IB20/TRANSFER_SENDER_POLICY) | `0xd116fc21` | Policy slot consulted against `from` on every transfer (including `transferFrom`). | | [`TRANSFER_RECEIVER_POLICY`](/base-chain/specs/reference/b20/interfaces/IB20/TRANSFER_RECEIVER_POLICY) | `0x210f521b` | Policy slot consulted against `to` on every transfer. | | [`TRANSFER_EXECUTOR_POLICY`](/base-chain/specs/reference/b20/interfaces/IB20/TRANSFER_EXECUTOR_POLICY) | `0x724e9c53` | Policy slot consulted against `msg.sender` on `transferFrom` when distinct from `from`. | | [`MINT_RECEIVER_POLICY`](/base-chain/specs/reference/b20/interfaces/IB20/MINT_RECEIVER_POLICY) | `0x6e5b013d` | Policy slot consulted against `to` on every mint. | | [`SEIZE_HOLDER_POLICY`](/base-chain/specs/reference/b20/interfaces/IB20/SEIZE_HOLDER_POLICY) | `0xb279d311` | Policy slot consulted against `from` by `seizeWithMemo`. | | [`SEIZE_RECEIVER_POLICY`](/base-chain/specs/reference/b20/interfaces/IB20/SEIZE_RECEIVER_POLICY) | `0xb31da27f` | Policy slot consulted against `to` by `seizeWithMemo`. | | [`name`](/base-chain/specs/reference/b20/interfaces/IB20/name) | `0x06fdde03` | Token name. Set at creation, mutable via `updateName`. | | [`symbol`](/base-chain/specs/reference/b20/interfaces/IB20/symbol) | `0x95d89b41` | Token symbol. Set at creation, mutable via `updateSymbol`. | | [`decimals`](/base-chain/specs/reference/b20/interfaces/IB20/decimals) | `0x313ce567` | Number of decimal places. Immutable per token variant. | | [`totalSupply`](/base-chain/specs/reference/b20/interfaces/IB20/totalSupply) | `0x18160ddd` | Total token supply currently in circulation. | | [`balanceOf`](/base-chain/specs/reference/b20/interfaces/IB20/balanceOf) | `0x70a08231` | Balance of `account`. | | [`allowance`](/base-chain/specs/reference/b20/interfaces/IB20/allowance) | `0xdd62ed3e` | Allowance granted by `owner` to `spender`. | | [`transfer`](/base-chain/specs/reference/b20/interfaces/IB20/transfer) | `0xa9059cbb` | Transfers `amount` from `msg.sender` to `to`. Emits `Transfer`. | | [`transferFrom`](/base-chain/specs/reference/b20/interfaces/IB20/transferFrom) | `0x23b872dd` | Transfers `amount` from `from` to `to` using `msg.sender`'s allowance. Emits `Transfer`. | | [`approve`](/base-chain/specs/reference/b20/interfaces/IB20/approve) | `0x095ea7b3` | Sets `spender`'s allowance to `amount`. Not gated by any policy or by pause. Emits `Approval`. | | [`updateName`](/base-chain/specs/reference/b20/interfaces/IB20/updateName) | `0x84da92a7` | Updates the token's `name`. Emits `NameUpdated` followed by `EIP712DomainChanged`. | | [`updateSymbol`](/base-chain/specs/reference/b20/interfaces/IB20/updateSymbol) | `0x537f5312` | Updates the token's `symbol`. Emits `SymbolUpdated`. | | [`transferWithMemo`](/base-chain/specs/reference/b20/interfaces/IB20/transferWithMemo) | `0x95777d59` | Same as `transfer`, plus emits `Memo` immediately after the standard `Transfer` event. | | [`transferFromWithMemo`](/base-chain/specs/reference/b20/interfaces/IB20/transferFromWithMemo) | `0x929c2539` | Same as `transferFrom`, plus emits `Memo` immediately after the standard `Transfer` event. | | [`mint`](/base-chain/specs/reference/b20/interfaces/IB20/mint) | `0x40c10f19` | Mints `amount` to `to`. Emits `Transfer(address(0), to, amount)`. | | [`mintWithMemo`](/base-chain/specs/reference/b20/interfaces/IB20/mintWithMemo) | `0xe44f0b12` | Same as `mint`, plus emits `Memo` immediately after the standard `Transfer` event. | | [`burn`](/base-chain/specs/reference/b20/interfaces/IB20/burn) | `0x42966c68` | Burns `amount` from the caller's own balance. Not subject to any policy. | | [`burnWithMemo`](/base-chain/specs/reference/b20/interfaces/IB20/burnWithMemo) | `0x38f23b0b` | Same as `burn`, plus emits `Memo` immediately after the standard `Transfer` event. | | [`burnBlocked`](/base-chain/specs/reference/b20/interfaces/IB20/burnBlocked) | `0xec0cf3dc` | DEPRECATED. Burns `amount` from a `from` account that is blocked under `TRANSFER_SENDER_POLICY`. | | [`seizeWithMemo`](/base-chain/specs/reference/b20/interfaces/IB20/seizeWithMemo) | `0xf916d81b` | Seizes `amount` of `from`'s balance and reassigns it to `to` in a single admin operation. | | [`hasRole`](/base-chain/specs/reference/b20/interfaces/IB20/hasRole) | `0x91d14854` | Whether `account` is a member of `role`. User-defined roles are supported and have no | | [`getRoleAdmin`](/base-chain/specs/reference/b20/interfaces/IB20/getRoleAdmin) | `0x248a9ca3` | The role required to grant or revoke `role`. Defaults to `DEFAULT_ADMIN_ROLE` if not | | [`grantRole`](/base-chain/specs/reference/b20/interfaces/IB20/grantRole) | `0x2f2ff15d` | Grants `role` to `account`. Emits `RoleGranted`. | | [`revokeRole`](/base-chain/specs/reference/b20/interfaces/IB20/revokeRole) | `0xd547741f` | Revokes `role` from `account`. Emits `RoleRevoked`. | | [`renounceRole`](/base-chain/specs/reference/b20/interfaces/IB20/renounceRole) | `0x36568abe` | Caller renounces `role` for themselves. Emits `RoleRevoked`. | | [`renounceLastAdmin`](/base-chain/specs/reference/b20/interfaces/IB20/renounceLastAdmin) | `0x6f79e3d7` | Permanently transitions the token to a zero-admin state. Revokes `DEFAULT_ADMIN_ROLE` | | [`setRoleAdmin`](/base-chain/specs/reference/b20/interfaces/IB20/setRoleAdmin) | `0x1e4e0091` | Sets the admin role for `role`. Emits `RoleAdminChanged`. | | [`pausedFeatures`](/base-chain/specs/reference/b20/interfaces/IB20/pausedFeatures) | `0xde9997e3` | The `PausableFeature`s currently paused on this token. Order is implementation-defined; | | [`isPaused`](/base-chain/specs/reference/b20/interfaces/IB20/isPaused) | `0x165c44bc` | Whether `feature` is currently paused. O(1). | | [`pause`](/base-chain/specs/reference/b20/interfaces/IB20/pause) | `0x9f98bd2d` | Pauses each of `features`. Additive: features already paused remain paused; duplicates | | [`unpause`](/base-chain/specs/reference/b20/interfaces/IB20/unpause) | `0xb61b2ebc` | Unpauses each of `features`. Features not listed are unaffected; duplicates are idempotent. | | [`policyId`](/base-chain/specs/reference/b20/interfaces/IB20/policyId) | `0xdb3de624` | The current policy ID configured for `policyScope`. Returns `0` (always-allow built-in) | | [`updatePolicy`](/base-chain/specs/reference/b20/interfaces/IB20/updatePolicy) | `0xadf9c4ea` | Updates the policy ID assigned to `policyScope`. Takes effect immediately for the next | | [`supplyCap`](/base-chain/specs/reference/b20/interfaces/IB20/supplyCap) | `0x8f770ad0` | The maximum total supply enforced on `mint`. Capped at `type(uint128).max`, which | | [`updateSupplyCap`](/base-chain/specs/reference/b20/interfaces/IB20/updateSupplyCap) | `0xe5a97f07` | Sets a new supply cap. May be raised or lowered freely, but never below current | | [`DOMAIN_SEPARATOR`](/base-chain/specs/reference/b20/interfaces/IB20/DOMAIN_SEPARATOR) | `0x3644e515` | The current EIP-712 domain separator for this token. Recomputed on each call so it | | [`nonces`](/base-chain/specs/reference/b20/interfaces/IB20/nonces) | `0x7ecebe00` | The current EIP-2612 permit nonce for `owner`. Incremented by 1 on each successful `permit`. | | [`permit`](/base-chain/specs/reference/b20/interfaces/IB20/permit) | `0xd505accf` | EIP-2612 permit. Recovers `owner` via ECDSA from `(v, r, s)`. EOA signatures only; | | [`eip712Domain`](/base-chain/specs/reference/b20/interfaces/IB20/eip712Domain) | `0x84b0196e` | ERC-5267 EIP-712 domain introspection. | | [`contractURI`](/base-chain/specs/reference/b20/interfaces/IB20/contractURI) | `0xe8a3d485` | Off-chain URI pointing at contract-level metadata for this token, per ERC-7572. | | [`updateContractURI`](/base-chain/specs/reference/b20/interfaces/IB20/updateContractURI) | `0x7e5b1e24` | Updates `contractURI`. Emits the parameterless `ContractURIUpdated` event per ERC-7572; | ## Events | Event | Topic0 | Summary | | -------------------- | -------------------------------------------------------------------- | -------------------------------------------------------------------------------------------- | | `Transfer` | `0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef` | ERC-20 transfer event. Emitted on every successful transfer (including memo'd variants), | | `Approval` | `0x8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925` | ERC-20 approval event. Emitted by `approve` and `permit`. | | `Memo` | `0x6989f5818dcfd11f8cd53b27c94cec33dae1589735f03e639cba54553a1825e8` | Emitted by `transferWithMemo`, `transferFromWithMemo`, `mintWithMemo`, and `burnWithMemo` | | `BurnedBlocked` | `0x0b552e96653fd6842da37c477005d3b5c08a8c7d3631b1f43787b2dc9a1006a3` | Emitted by the deprecated `burnBlocked` in addition to `Transfer(from, address(0), amount)`. | | `Seized` | `0xa9aec5d8b86e2fa2fd6ac3af62f2622e3dfdab1967d4cbbb56a5df7d74cb887c` | Emitted by `seizeWithMemo` in addition to `Transfer(from, to, amount)` (and the | | `RoleGranted` | `0x2f8788117e7eff1d82e926ec794901d17c78024a50270940304540a733656f0d` | Emitted when `account` is granted `role`. `sender` is the originating caller. | | `RoleRevoked` | `0xf6391f5c32d9c69d2a47ea670b442974b53935d1edc7fd64eb21e047a839171b` | Emitted when `role` is revoked from `account`. `sender` is the originating caller | | `RoleAdminChanged` | `0xbd79b86ffe0ab8e8776151514217cd7cacd52c909f66475c3af44e129f0b00ff` | Emitted by `setRoleAdmin` when the admin role for `role` changes. | | `LastAdminRenounced` | `0xe8d3a9872e7ca325571ff1e4c51ddd69090a0345240cc605ccde365ec867cc67` | Emitted by `renounceLastAdmin` in addition to the standard | | `Paused` | \`0x43e072977b8 | |