IB20Factory.isB20

Returns whether an address matches the B20 address prefix, recovered from the address itself without consulting a registry.

Signature

IB20Factory.sol

function isB20(address token) external view returns (bool);

Field	Value
Selector	0xfa19b927
Canonical signature	isB20(address)

Description

Returns true when token bears the 0xB2 address prefix (byte [0] is 0xB2, bytes [1:9] are zero). The check reads the address directly; it does not consult a registry or any on-chain state. Never reverts.

isB20 is a prefix-only check. It can return true for an address the Factory has not yet created. Use isB20Initialized when you need to confirm the token is live, that stronger check also requires the 0xef bytecode stub the Factory plants during createB20.

Parameters

Name	Type	Description
token	address	Address to check.

Returns

Type	Description
bool	true if token matches the B20 address prefix; false otherwise.

Access Control

View, no access restriction.

Policy Interaction

No policy interaction.

Example

Usage Example

IB20Factory(factory).isB20(token);