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If we have 16K of transaction in 4MB block so on average each transaction is 250B. Together with header of 80B and merkle path of 448B we need 778B which is 5141 times smaller than the size of 4MB block.
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@ -527,7 +527,7 @@ The largest possible block can hold almost 16,000 transactions in 4,000,000
bytes, but proving any particular one of those 16,000 transactions
is a part of that block only requires a copy of the transaction, a copy
of the 80-byte block header, and 448 bytes for the merkle proof. That
makes the largest possible proof almost 10,000 times smaller than the
makes the largest possible proof almost 5,000 times smaller than the
largest possible Bitcoin block.
=== Merkle Trees and Lightweight Clients