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# BlockSourceError.notSupported

The source does not implement the requested method.

```
case notSupported
```

## Discussion

Reserved for conformers that deliberately decline specific methods
(e.g., a “headers-only” source that declines [`block(for:)`](/documentation/BitcoinKernel/BlockSource/block(for:))).
[`EsploraBlockSource`](/documentation/BitcoinKernel/EsploraBlockSource) never throws this — every method is supported.