Absolutely. This is what Planaria is about, as well as Matterpool's TXQ.
I'd call these "blockchain archival services," which you can see in more detail here:
See the last image in that thread in particular, the green nodes. That's your 'sub-nodes'.
twetch#622 6.8y
What the chain says
- Block
- 655 036
- Time
- 2020-10-01T21:15:59Z
- Signer
- 15YXRhqbHawbH49aYzfiww2UQ4Cz82GL4t
- App
- twetch
- Type
- post
- Content type
- text/plain
- Name in tx
- twetch#622
Fields the transaction did not carry are omitted. Open the payload to see the bytes as stored.
Signed by
15YXRhqbHawbH49aYzfiww2UQ4Cz82GL4t Verified