State transitions are the means for submitting data that creates, updates, or deletes platform data and results in a change to a new state. Each one must contain:
Fees
State transition fees are paid via the credits established when an identity is created. Credits are created at a rate of 1000 credits/hellars. Fees for actions vary based on parameters related to storage and computational effort that are defined in rs-hpp.
Size
All serialized data (including state transitions) is limited to a maximum size of 16 KB.
All state transitions include the following fields:
| Field | Type | Description |
|---|---|---|
| protocolVersion | integer | The platform protocol version (currently 1) |
| type | integer | State transition type: |
0 - data contract create |
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1 - documents batch |
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2 - identity create |
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3 - identity topup |
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4 - data contract update |
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5 - identity update |
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| signature | array of bytes | Signature of state transition data (65 bytes) |
Additionally, all state transitions except the identity create and topup state transitions include:
| Field | Type | Description |
|---|---|---|
| signaturePublicKeyId | integer | The id of the identity public key that signed the state transition (=> 0) |
| Field | Type | Description |
|---|---|---|
| dataContract | data contract object | Object containing valid data contract details |
| entropy | array of bytes | Entropy used to generate the data contract ID (32 bytes) |
More detailed information about the dataContract object can be found in the data contract section.
Entropy is included in Data Contracts and Documents.
// From the Rust reference implementation (rs-hpp) // entropyGenerator.js fn generate(&self) -> anyhow::Result<[u8; 32]> { let mut buffer = [0u8; 32]; getrandom(&mut buffer).context("generating entropy failed")?; Ok(buffer) }