The transaction ID/Merkle proof is the only real permalink …
The transaction ID/Merkle proof is the only real permalink in the world.
Even if the data is gone from all the nodes in the world, you can still prove validity if you somehow get a copy of it.
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Exactly.
This is lost in translation around pruning or abandoned data onchain in the far far future.
One interesting point is that if you don't have the transaction in full, only the data put into the transaction, you can't validate it unless you originally created the transaction and can recreate it with the original UTXOs.