메타마스크가 계정 생성 시 3개의 정보 담고 있음
-account address
: identifies your account
-public key
-private key
: 절대 공개되어서는 안됨
: used to authorize the sending of funds from your account to other accounts
-> all stored as hex numbers
0x253...
=my account address
-> One account is used across all networks
; don't have to create seperate accounts for each network
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