# block

**Type:** GraphQL queries

**Description:**
Retrieve detailed information about a specific block using its unique hash.

Every block in the Kadena blockchain is identified by a cryptographic hash — a unique fingerprint generated from its contents.
This query allows you to look up a block directly by that hash, returning all available details about it, such as its height, creation time, transactions, miner, and more.

This is especially useful when you already know the block’s hash (for example, from a transaction receipt or an event log) and want to quickly inspect or verify that block’s contents without scanning the entire chain.

## Arguments
- hash (String): The unique cryptographic hash (identifier) of the block to retrieve.

## Response
**Type:** Block
**Description:**
A **Block** is the fundamental unit of the Kadena blockchain.
Each block bundles a verified set of transactions and metadata that secure and extend the chain.
Blocks are linked together cryptographically — each one referencing its parent — forming the immutable and tamper-evident chain structure.
This type exposes all the core properties of a block, including consensus data (like difficulty, nonce, and proof of work), network metadata (like chain ID and epoch), and relations to transactions, events, and neighboring blocks.

### Fields
- id (ID): Globally unique identifier for this block node.
- hash (String): The cryptographic hash of the block.
This serves as its unique identifier within the blockchain.
- chainId (BigInt): The specific chain where this block was mined.
Kadena is a multi-chain system, and each block belongs to exactly one chain.
- creationTime (DateTime): The timestamp when this block was created and added to the chain.
- difficulty (BigInt): The network difficulty at the time the block was mined.
Higher difficulty reflects the amount of computational work required to produce a valid block.
- epoch (DateTime): The epoch timestamp marking when the difficulty was last adjusted.
Kadena targets ~30 seconds per block, and the difficulty is recalibrated periodically to maintain that target.
- flags (Decimal): Consensus flags used internally by the protocol.
- height (BigInt): The height (block number) of this block within its chain.
The genesis block is height 0, and each subsequent block increments by 1.
- nonce (Decimal): A nonce value used in the proof-of-work process.
Miners vary this value to discover a hash below the target threshold.
- payloadHash (String): The hash of the payload data contained within the block.
This ensures the integrity of the transactions and other included data.
- weight (String): The cumulative weight of the chain up to and including this block.
Weight increases with each mined block and helps determine the canonical chain.
- target (String): The target hash threshold that the block’s proof-of-work hash must fall below.
This value adjusts with difficulty to regulate block production time.
- coinbase (String): The coinbase transaction data.
This transaction rewards the miner and may include information about block rewards or other protocol-defined payouts.
- neighbors (BlockNeighbor): The neighboring blocks that reference this block as a parent.
These neighbors are essential in Kadena’s braided multi-chain architecture.
- powHash (String): The proof-of-work hash of the block.
This is the result of hashing the block header with the nonce and must satisfy the target condition.
- canonical (Boolean): Indicates whether this block is part of the canonical chain.
Non-canonical blocks may occur during temporary forks or reorganizations.
- parent (Block): The parent block directly preceding this one in the chain.
Together with the hash, this forms the cryptographic link that secures the chain.
- totalGasUsedInKda (Decimal): The total amount of gas used by all transactions in this block, expressed in KDA.
- events (BlockEventsConnection): Paginated list of events emitted by transactions within this block.
- minerAccount (FungibleChainAccount): The account that mined this block and received the coinbase reward.
- transactions (BlockTransactionsConnection): Paginated list of transactions included in this block.