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02_state.md

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State

Accounts

Accounts contain authentication information for a uniquely identified external user of an SDK blockchain, including public key, address, and account number / sequence number for replay protection. For efficiency, since account balances must also be fetched to pay fees, account structs also store the balance of a user as sdk.Coins.

Accounts are exposed externally as an interface, and stored internally as either a base account or vesting account. Module clients wishing to add more account types may do so.

  • 0x01 | Address -> amino(account)

Account Interface

The account interface exposes methods to read and write standard account information. Note that all of these methods operate on an account struct confirming to the interface

  • in order to write the account to the store, the account keeper will need to be used.
type Account interface {
  GetAddress() AccAddress
  SetAddress(AccAddress)

  GetPubKey() PubKey
  SetPubKey(PubKey)

  GetAccountNumber() uint64
  SetAccountNumber(uint64)

  GetSequence() uint64
  SetSequence(uint64)

  GetCoins() Coins
  SetCoins(Coins)
}

Base Account

A base account is the simplest and most common account type, which just stores all requisite fields directly in a struct.

type BaseAccount struct {
  Address       AccAddress
  Coins         Coins
  PubKey        PubKey
  AccountNumber uint64
  Sequence      uint64
}

Vesting Account

See Vesting.