- # KVStore
-
- There are two app's here: the KVStoreApplication and the PersistentKVStoreApplication.
-
- ## KVStoreApplication
-
- The KVStoreApplication is a simple merkle key-value store.
- Transactions of the form `key=value` are stored as key-value pairs in the tree.
- Transactions without an `=` sign set the value to the key.
- The app has no replay protection (other than what the mempool provides).
-
- ## PersistentKVStoreApplication
-
- The PersistentKVStoreApplication wraps the KVStoreApplication
- and provides two additional features:
-
- 1) persistence of state across app restarts (using Tendermint's ABCI-Handshake mechanism)
- 2) validator set changes
-
- The state is persisted in leveldb along with the last block committed,
- and the Handshake allows any necessary blocks to be replayed.
- Validator set changes are effected using the following transaction format:
-
- ```md
- "val:pubkey1!power1,pubkey2!power2,pubkey3!power3"
- ```
-
- where `pubkeyN` is a base64-encoded 32-byte ed25519 key and `powerN` is a new voting power for the validator with `pubkeyN` (possibly a new one).
- To remove a validator from the validator set, set power to `0`.
- There is no sybil protection against new validators joining.
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