current-docu/Dabory-SequenceDiagram/BlockChain/contract-validation-metamask.uml

@startuml
title "Contract Vefication with MetaMask"

boundary User_Page as userpage
participant Frontend_Server as fe
participant Backend_Server as be
database db
participant MetaMask as mt
participant Ethereum_Net as eth

autonumber

fe->be: send contract addr
be->db: find if contract addr exists

note over db #99FF99
 <b>contract-creator</b>
 <b>ownership</b>
    scaned and saved 
    During sync-block 
end note
db->be: contract creator's addr
be->fe: creators addr \nif contract addr exists

note over fe
(1) creator's addr
(2) message to sign
end note
fe->mt: metamask call

/'6'/
mt->eth: request sinature by private key

note over mt
(1) metamask login
(2) get Ether Signature
end note

mt->eth: request sinature by private key
eth->mt : Ether Signature

mt->fe: Message Signature Hash

note over fe
(1) Creator's addr
(2) signed message
(3) Message Signature Hash
end note

fe->be: Signature validation

note over be
Ether Sign Validation
end note

be->fe: validation OK.


@enduml