blob/add capability allows agent to store a Blob into a (memory) space
identified by did:key in the with field. Agent should compute blob multihash
and size and provide it under nb.blob field, allowing a service to provision
a write location for the agent to PUT desired Blob into.
blob/addcapability allows agent to store a Blob into a (memory) space identified by did:key in thewithfield. Agent should compute blob multihash and size and provide it undernb.blobfield, allowing a service to provision a write location for the agent to PUT desired Blob into.