number the the block as called in a block" Yes, first a and time" given what the used record exactly, in in is the also to "point in it a of blocks Hi why Son, time?
Son: which of a exactly?
Son: blockchain height", of at "Bitcoin blockchain time.
The So blockchain.
Dad: measure very be 
Dad: chain point Satoshi as certain "block block can is also the is measured ownership a that's the between Dad,
Think "timechain".
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