could you please explain the aim of a pruned blockchain?
Seriously?
You're joking, right?
Are you just posting nonsense to try and increase your post count for your signature ad campaign?
Your question has now been answered three times in this thread...
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What it does do is decrease the amount of harddrive space needed.
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Pruning just reduces the number of blocks you keep stored on your computer.
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The goal of pruning is to decrease hard drive usage so that you don't have to have the whole blockchain (100gb) downloaded stored.
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and also, what is SPV node made for?
SPV means
Simplified
Payment
Verification.
https://bitcoin.org/bitcoin.pdf8. Simplified Payment Verification
. . . A user only needs to keep a copy of the block headers of the longest proof-of-work chain, which he can get by querying network nodes until he's convinced he has the longest chain, . . . He can't check the transaction for himself, but by linking it to a place in the chain, he can see that a network node has accepted it, and blocks added after it further confirm the network has accepted it. . . . the verification is reliable as long as honest nodes control the network, but is more vulnerable if the network is overpowered by an attacker.
It allows the wallet to identify confirmed payments by trusting other full nodes on the network instead of validating every transaction itself. As such, it doesn't need to store (or sync) the blockchain. It relies on other full nodes on the network to do that.
can it be a solution to speed-up the blockchain syncing even with lower amount of blocks ?
SPV is much faster than a full node because it doesn't sync the blockchain. It just needs the headers.