Blocks
A block is a fundamental data structure for organizing Aleo transactions over time.
Components of a Block​
An Aleo block is serialized in the following format:
| Parameter | Type | Description |
|---|---|---|
block_hash | string | The hash of the block |
previous_hash | string | The hash of the previous block |
header | object | The header of the block |
transactions | array | The transactions in the block |
ratificactions | array | The ratifications for proving rewards in the block |
coinbase | string | The coinbase puzzle solution constructed by accumulating the individual prover solutions. |
signature | string | The signature for the block |
Transactions​
The transactions are a list of all transactions that are included in the specified block.
Block Header​
The block header contains components that summarize the state of the specified block, as well as the state of the ledger at this point in history. See the components of a block header for more details.
Components of a Block Header​
An Aleo block header is serialized in the following format:
| Parameter | Type | Description |
|---|---|---|
previous_state_root | string | The Merkle root representing the blocks in the ledger up to the previous block. |
transactions_root | string | The Merkle root representing the transactions in the block. |
finalize_root | string | The Merkle root representing the on-chain finalize including the current block. |
ratifications_root | string | The Merkle root representing the ratifications in the block. |
coinbase_accumulator_point | string | The accumulator point of the coinbase puzzle. |
metadata | object | The metadata of the block. |
Metadata​
| Parameter | Type | Description |
|---|---|---|
network | u16 | The network ID of the block |
round | u64 | The round that produced this block - 8 bytes |
height | u32 | The height of this block - 4 bytes |
total_supply_in_microcredits | u64 | The total supply of microcredits - 8 bytes |
cumulative_weight | u128 | The cumulative weight for this block - 16 bytes |
cumulative_proof_weight | u128 | The cumulative proof target for this block - 16 bytes |
coinbase_target | u64 | The coinbase target for this block - 8 bytes |
proof_target | u64 | The proof target for this block - 8 bytes |
last_coinbase_target | u64 | The coinbase target for the last coinbase - 8 bytes |
last_coinbase_timestamp | u64 | The Unix timestamp (UTC) for the last coinbase - 8 bytes |
timestamp | i64 | The Unix timestamp (UTC) for this block - 8 bytes |