History

History of a blockchain system is some blocktree in fact(like this: http://image.slidesharecdn.com/sfbitcoindev-chepurnoy-2015-150322043044-conversion-gate01/95/proofofstake-its-improvements-san-francisco-bitcoin-devs-hackathon-12-638.jpg), where longest chain is being considered as canonical one, containing right kind of history.

In cryptocurrencies of today blocktree view is usually implicit, means code supports only linear history, but other options are possible.

To say "longest chain" is the canonical one is simplification, usually some kind of "cumulative difficulty" function has been used instead, even in PoW systems.

Linear Supertypes

AnyRef, Any

Known Subclasses

BlockChain, BlockTree

Abstract Value Members

abstract def appendBlock(block: Block): Try[BlocksToProcess]

Use BlockStorage.appendBlock(block: Block) if you want to automatically update state
Use BlockStorage.appendBlock(block: Block) if you want to automatically update state
Append block to a chain, based on it's reference
block
- block to append
returns
Blocks to process in state
abstract def blockAt(height: Int): Option[Block]
abstract def blockById(blockId: BlockId): Option[Block]
abstract def generatedBy(account: Account, from: Int, to: Int): Seq[Block]

returns
Get list of blocks generated by specified address in specified interval of blocks
abstract val genesis: Block
abstract def getCheckpoint: Option[Checkpoint]
abstract def height(): Int

Height of the a chain, or a longest chain in the explicit block-tree
abstract def heightOf(blockId: BlockId): Option[Int]
abstract def lastBlocks(howMany: Int): Seq[Block]
abstract def lookForward(parentSignature: BlockId, howMany: Int): Seq[BlockId]

Return $howMany blocks starting from $parentSignature
abstract def parent(block: Block, back: Int = 1): Option[Block]
abstract def score(): BlockchainScore

Quality score of a best chain, e.g.
Quality score of a best chain, e.g. cumulative difficulty in case of Bitcoin / Nxt
abstract def scoreOf(id: BlockId): BlockchainScore
abstract def setCheckpoint(checkpoint: Option[Checkpoint]): Unit

Concrete Value Members

final def !=(arg0: Any): Boolean

Definition Classes
AnyRef → Any
final def ##(): Int

Definition Classes
AnyRef → Any
final def ==(arg0: Any): Boolean

Definition Classes
AnyRef → Any
final def asInstanceOf[T0]: T0

Definition Classes
Any
def averageDelay(block: Block, blockNum: Int): Try[Long]

Average delay in milliseconds between last $blockNum blocks starting from $block
def blockById(blockId: String): Option[Block]
def clone(): AnyRef

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( ... )
def confirmations(block: Block): Option[Int]
def contains(id: BlockId): Boolean
def contains(block: Block): Boolean
final def eq(arg0: AnyRef): Boolean

Definition Classes
AnyRef
def equals(arg0: Any): Boolean

Definition Classes
AnyRef → Any
def finalize(): Unit

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( classOf[java.lang.Throwable] )
final def getClass(): Class[_]

Definition Classes
AnyRef → Any
def hashCode(): Int

Definition Classes
AnyRef → Any
def heightOf(block: Block): Option[Int]

Height of a block if it's in the blocktree
def isEmpty: Boolean

Is there's no history, even genesis block
final def isInstanceOf[T0]: Boolean

Definition Classes
Any
def lastBlock: Block

Block with maximum blockchain score
def lastBlockIds(howMany: Int): Seq[BlockId]
final def ne(arg0: AnyRef): Boolean

Definition Classes
AnyRef
final def notify(): Unit

Definition Classes
AnyRef
final def notifyAll(): Unit

Definition Classes
AnyRef
final def synchronized[T0](arg0: ⇒ T0): T0

Definition Classes
AnyRef
def toString(): String

Definition Classes
AnyRef → Any
final def wait(): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )
final def wait(arg0: Long, arg1: Int): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )
final def wait(arg0: Long): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )

Related Docs: object History | package transaction

trait History extends AnyRef

Abstract Value Members

abstract def appendBlock(block: Block): Try[BlocksToProcess]

abstract def blockAt(height: Int): Option[Block]

abstract def blockById(blockId: BlockId): Option[Block]

abstract def generatedBy(account: Account, from: Int, to: Int): Seq[Block]

abstract val genesis: Block

abstract def getCheckpoint: Option[Checkpoint]

abstract def height(): Int

abstract def heightOf(blockId: BlockId): Option[Int]

abstract def lastBlocks(howMany: Int): Seq[Block]

abstract def lookForward(parentSignature: BlockId, howMany: Int): Seq[BlockId]

abstract def parent(block: Block, back: Int = 1): Option[Block]

abstract def score(): BlockchainScore

abstract def scoreOf(id: BlockId): BlockchainScore

abstract def setCheckpoint(checkpoint: Option[Checkpoint]): Unit

Concrete Value Members

final def !=(arg0: Any): Boolean

final def ##(): Int

final def ==(arg0: Any): Boolean

final def asInstanceOf[T0]: T0

def averageDelay(block: Block, blockNum: Int): Try[Long]

def blockById(blockId: String): Option[Block]

def clone(): AnyRef

def confirmations(block: Block): Option[Int]

def contains(id: BlockId): Boolean

def contains(block: Block): Boolean

final def eq(arg0: AnyRef): Boolean

def equals(arg0: Any): Boolean

def finalize(): Unit

final def getClass(): Class[_]

def hashCode(): Int

def heightOf(block: Block): Option[Int]

def isEmpty: Boolean

final def isInstanceOf[T0]: Boolean

def lastBlock: Block

def lastBlockIds(howMany: Int): Seq[BlockId]

final def ne(arg0: AnyRef): Boolean

final def notify(): Unit

final def notifyAll(): Unit

final def synchronized[T0](arg0: ⇒ T0): T0

def toString(): String

final def wait(): Unit

final def wait(arg0: Long, arg1: Int): Unit

final def wait(arg0: Long): Unit

Inherited from AnyRef

Inherited from Any

Ungrouped