Transactions
To interact with an account (externally-owned or contract), one has to issue transactions. Each transaction is a data package signed by an externally-owned account.
Usage of Transactions
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The simplest usage of a transaction is to transfer native assets (such as $ZIL) from one externally-owned account to another externally-owned account or a contract account.
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A transaction is issued when an externally-owned account deploys a contract on the network.
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A transaction may also be issued to call a function in the smart contract associated to a contract account which may in turn trigger calls to other contracts creating a call graph. Note that calls from one contract account to another happens via inter-contract message calls and are not using transactions per se.