Hashes & Multihashes
Hash stores keyed state.
Declaration
python
balances = Hash(default_value=0)
metadata = Hash()Basic Access
python
balances["alice"] = 100
balance = balances["alice"]Multi-Dimensional Keys
Hashes support tuple keys:
python
allowances["alice", "dex"] = 500
amount = allowances["alice", "dex"]The runtime currently allows up to 16 key dimensions.
Collection Helpers
python
balances.all()
balances.all("alice")
balances._items()
balances.clear()
balances.clear("alice")Key Rules
- keys are converted to strings
.and:are not allowed inside key parts- slices are not allowed
- oversized keys are rejected
When to Use
Use Hash for mappings, registries, ledgers, and sparse structured state.