util

func BlockToDelOPs ¶

func BlockToDelOPs(
	blk *btcutil.Block) []wire.OutPoint

blockToDelOPs gives all the UTXOs in a block that need proofs in order to be deleted. All txinputs except for the coinbase input and utxos created within the same block (on the skiplist)

func CheckMagicByte ¶

func CheckMagicByte(bytesgiven []byte) bool

CheckMagicByte checks for the Bitcoin magic bytes. returns false if it didn't read the Bitcoin magic bytes. Checks only for testnet3 and mainnet

func DedupeBlock ¶

func DedupeBlock(
	blk *btcutil.Block) (inCount, outCount uint32, inskip, outskip []uint32)

DedupeBlock takes a bitcoin block, and returns two int slices: the indexes of inputs, and idexes of outputs which can be removed. These are indexes within the block as a whole, even the coinbase tx. So the coinbase tx in & output numbers affect the skip lists even though the coinbase ins/outs can never be deduped. it's simpler that way.

func HasAccess ¶

func HasAccess(fileName string) bool

HasAccess reports whether we have access to the named file. Returns true if HasAccess, false if it doesn't. Does NOT tell us if the file exists or not. File might exist but may not be available to us

func IsUnspendable ¶

func IsUnspendable(o *wire.TxOut) bool

IsUnspendable determines whether a tx is spendable or not. returns true if spendable, false if unspendable.

func OutpointToBytes ¶

func OutpointToBytes(op *wire.OutPoint) (b [36]byte)

turns an outpoint into a 36 byte... mixed endian thing. (the 32 bytes txid is "reversed" and the 4 byte index is in order (big)

func PopPrefixLen16 ¶

func PopPrefixLen16(b []byte) ([]byte, []byte, error)

func PrefixLen16 ¶

func PrefixLen16(b []byte) []byte

PrefixLen16 puts a 2 byte length prefix in front of a byte slice