# Protocol Tokens The Blend protocol represents all positions for a pool with tokens. This allows the pool to track interest fairly across multiple suppliers and borrowers for a given reserve. All protocol tokens are non-transferable, and are only an accounting method to safely represent positions. When reading positions for an address via the `get_positions(address: Address)` function, the value returned is a Map of the reserve's index to the BToken or DToken balance. ## bTokens A bToken represents a supply made to a Blend pool. Each reserve has a unique bToken per pool, and they are non-transferable. bTokens are converted to and from underlying assets with the reserve's `bRate`. The `bRate` is adjusted when interest is accrued. $$ bTokens = \frac{underlying}{bRate} $$ $$ underlying = bRate\*bRokens $$ ## dTokens A dToken represents a liability against a Blend pool. Each reserve has a unique dToken per pool, and they are non-transferable. dTokens are converted to and from underlying assets with the reserve's `dRate`. The `dRate` is adjusted when interest is accrued. $$ dTokens = \frac{underlying}{dRate} $$ $$ underlying = dRate\*dTokens $$ --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs-v1.blend.capital/tech-docs/core-contracts/lending-pool/protocol-tokens.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.