The JSON-LD of the actor from the Fedify Example Blog. It has the assertionMethods property besides the publicKey property.
https://todon.eu/system/media_attachments/files/112/575/518/912/659/567/original/74a223df84d37137.png
FEP-521a has been implemented in #Fedify.
Actors now have the #assertionMethods property, and the #Multikey class has been added. For example, if you look at the the actor from the Fedify Example Blog (https://fedify-blog.deno.dev/users/fedify-example), you can see that it has the assertionMethods property in addition to the publicKey property.
You can try it out in version 0.10.0-dev.196+55cc34d1.
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