# Block

**Type:** GraphQL objects

**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, Not Null): The neighboring blocks that reference this block as a parent.
These neighbors are essential in Kadena’s braided multi-chain architecture.
  - chainId (String)
  - hash (String)
- 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.
  - 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.
- totalGasUsedInKda (Decimal): The total amount of gas used by all transactions in this block, expressed in KDA.
- events (BlockEventsConnection, Not Null): Paginated list of events emitted by transactions within this block.
  - edges (BlockEventsConnectionEdge)
  - pageInfo (PageInfo)
  - totalCount (Int)
- minerAccount (FungibleChainAccount, Not Null): The account that mined this block and received the coinbase reward.
  - id (ID): Globally unique identifier for this chain account node.
  - accountName (String): The full name of the account (e.g., `k:abcdef123456...` for a user account or `free.my-contract` for a contract account).
  - balance (Float): The current balance of this account on the specified chain for the given fungible token.
  - chainId (String): The chain ID where this account exists.
  - fungibleName (String): The name of the fungible token module associated with this account (e.g., `coin`).
  - guard (IGuard): The guard that defines the account’s security conditions.
A guard determines who must sign transactions in order to spend from this account.
  - transactions (FungibleChainAccountTransactionsConnection): Paginated list of transactions involving this account on this chain.
Transactions represent operations such as transfers, contract calls, or other state changes.
  - transfers (FungibleChainAccountTransfersConnection): Paginated list of token transfers into or out of this account on this chain.
Transfers are a subset of events focused specifically on balance movements.
- transactions (BlockTransactionsConnection, Not Null): Paginated list of transactions included in this block.
  - edges (BlockTransactionsConnectionEdge)
  - pageInfo (PageInfo)
  - totalCount (Int)