Events - Base Documentation

Exhaustive list of events emitted by the B20 system, grouped by declaring file.

`IB20`

Event	Emitted by	When
`Transfer(address indexed from, address indexed to, uint256 amount)`	`transfer`, `transferFrom`, `transferWithMemo`, `transferFromWithMemo`, `mint`, `mintWithMemo`, `burn`, `burnWithMemo`, `burnBlocked`, `seizeWithMemo`	Every successful transfer, mint (`from = address(0)`), or burn (`to = address(0)`), including memo’d, blocked-burn, and seize variants.
`Approval(address indexed owner, address indexed spender, uint256 amount)`	`approve`, `permit`	An allowance is set.
`Memo(address indexed caller, bytes32 indexed memo)`	`transferWithMemo`, `transferFromWithMemo`, `mintWithMemo`, `burnWithMemo`	Immediately after the underlying `Transfer` event. `caller` is the `msg.sender` of the memo’d call.
`BurnedBlocked(address indexed caller, address indexed from, uint256 amount)`	`burnBlocked` (deprecated)	In addition to `Transfer(from, address(0), amount)`.
`Seized(address indexed caller, address indexed from, address indexed to, uint256 amount)`	`seizeWithMemo`	In addition to `Transfer(from, to, amount)` and `Memo(caller, memo)`. Records a transfer-based seizure.
`RoleGranted(bytes32 indexed role, address indexed account, address indexed sender)`	`grantRole`	`account` is granted `role`. `sender` is the originating caller.
`RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender)`	`revokeRole`, `renounceRole`, `renounceLastAdmin`	`role` is revoked from `account`. `sender` is the admin bearer (`revokeRole`) or `account` itself (`renounceRole`/`renounceLastAdmin`).
`RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole)`	`setRoleAdmin`	The admin role for `role` changes.
`LastAdminRenounced(address indexed previousAdmin)`	`renounceLastAdmin`	In addition to the standard `RoleRevoked(DEFAULT_ADMIN_ROLE, previousAdmin, previousAdmin)` event.
`Paused(address indexed updater, PausableFeature[] features)`	`pause`	`features` is the call argument (not the resulting paused state).
`Unpaused(address indexed updater, PausableFeature[] features)`	`unpause`	`features` is the call argument (not the resulting paused state).
`PolicyUpdated(bytes32 indexed policyScope, uint64 oldPolicyId, uint64 newPolicyId)`	`updatePolicy`; also token creation	A token’s policy slot changes. Initial slot assignment at creation also emits this with `oldPolicyId == 0`.
`SupplyCapUpdated(address indexed updater, uint256 oldSupplyCap, uint256 newSupplyCap)`	`updateSupplyCap`	The supply cap changes.
`ContractURIUpdated()`	`updateContractURI`	Parameterless per ERC-7572; integrators re-fetch `contractURI()`.
`NameUpdated(address indexed updater, string newName)`	`updateName`	The token name changes. Carries the new name string.
`SymbolUpdated(address indexed updater, string newSymbol)`	`updateSymbol`	The token symbol changes. Carries the new symbol string.
`EIP712DomainChanged()`	`updateName`	ERC-5267 domain-change signal, emitted exactly once per successful call, immediately after `NameUpdated`. `updateSymbol` does NOT emit this.

`IB20Asset`

Event	Emitted by	When
`MultiplierUpdated(uint256 multiplier)`	`updateMultiplier` (deprecated instant setter)	Deprecated legacy-topic mirror, emitted alongside `UIMultiplierUpdated` so indexers on the old topic keep working.¹
`UIMultiplierUpdateCancelled(uint256 cancelledMultiplier, uint256 cancelledEffectiveAt)`	`cancelUIMultiplierUpdate`; `updateUIMultiplier`	A scheduled multiplier update is cancelled — explicitly, or implicitly when `updateUIMultiplier` clears a live pending update.
`ExtraMetadataUpdated(string key, string value)`	`updateExtraMetadata`	An extra-metadata entry is set, updated, or removed (empty `value` indicates removal).
`Announcement(address indexed caller, string id, string description, string uri)`	`announce`	Opens an announcement bracket.
`EndAnnouncement(string id)`	`announce`	Closes the bracket opened by the paired `Announcement` with the same `id`.

`IB20Factory`

Event	Emitted by	When
`B20Created(address indexed token, B20Variant indexed variant, string name, string symbol, uint8 decimals, bytes variantEventParams)`	`createB20`	Once per invocation, after the token’s identity is sealed and before any `initCalls` are dispatched. `variantEventParams` carries variant-specific identity data (empty for ASSET; ABI-encoded `B20StablecoinEventParams` for STABLECOIN).

`IPolicyRegistry`

Event	Emitted by	When
`PolicyCreated(uint64 indexed policyId, address indexed creator, PolicyType policyType)`	`createPolicy`, `createPolicyWithAccounts`, `createCompositePolicy`	A new policy is created.
`PolicyAdminStaged(uint64 indexed policyId, address indexed currentAdmin, address indexed pendingAdmin)`	`stageUpdateAdmin`	A new admin is staged. `pendingAdmin == address(0)` clears a prior nomination.
`PolicyAdminUpdated(uint64 indexed policyId, address indexed previousAdmin, address indexed newAdmin)`	`finalizeUpdateAdmin`, `renounceAdmin`; also policy creation	The active admin changes. `newAdmin == address(0)` indicates renunciation; `previousAdmin == address(0)` indicates initial assignment at creation.
`AllowlistUpdated(uint64 indexed policyId, address indexed updater, bool allowed, address[] accounts)`	`updateAllowlist`	One or more accounts have their ALLOWLIST membership set to `allowed` in a single batch.
`BlocklistUpdated(uint64 indexed policyId, address indexed updater, bool blocked, address[] accounts)`	`updateBlocklist`	One or more accounts have their BLOCKLIST membership set to `blocked` in a single batch.
`CompositePolicyUpdated(uint64 indexed policyId, address indexed updater, uint64[] childPolicyIds)`	`createCompositePolicy`, `updateComposite`	A composite policy’s child set is set or replaced in full. Emitted on creation and on every subsequent update; carries the complete post-update set.

`IActivationRegistry`

Event	Emitted by	When
`FeatureActivated(bytes32 indexed feature, address indexed caller)`	`activate`	`feature` is activated.
`FeatureDeactivated(bytes32 indexed feature, address indexed caller)`	`deactivate`	`feature` is deactivated.

`IERC8056` (`IScaledUIAmount`)

Event	Emitted by	When
`UIMultiplierUpdated(uint256 oldMultiplier, uint256 newMultiplier, uint256 effectiveAtTimestamp)`	`updateUIMultiplier` (scheduled); `updateMultiplier` (deprecated instant setter)	The UI multiplier is updated — scheduled setters emit this alone; the deprecated instant setter emits this alongside `MultiplierUpdated`.

The function-level docs show only updateMultiplier emitting MultiplierUpdated; the scheduled updateUIMultiplier emits UIMultiplierUpdated only. The event’s own doc-comment in source additionally names updateUIMultiplier as an emitter of MultiplierUpdated, which conflicts with updateUIMultiplier’s own @notice — flagging here rather than silently picking one. ↩