Chapter 1 assessment 3

Help me Todd. Please.

Question 1

The time is 1673585961 as a UNIX epoch and the block height is 774471. A transaction is made that spends three inputs with UINTMAX nSequences, one input with an nSequence of 0x000000FF and an nLockTime of 0x000BD1D7. Assuming regular 10 minute block intervals, after which time will the transaction be included in a block if broadcast ?

• Now

• 12 hours

• 24 hours

• 48 hours

• 72 hours

• Not until input 4's nSequence is UINTMAX.

Question 2

Flag	SIGHASH Value	Functional Meaning
SIGHASH_ALL	0x41 / 0100 0001	Sign all inputs and outputs
SIGHASH_NONE	0x42 / 0100 0010	Sign all inputs and no output
SIGHASH_SINGLE	0x43 / 0100 0011	Sign all inputs and the output with the same index
SIGHASH_ALL | ANYONECANPAY	0xC1 / 1100 0001	Sign its own input and all outputs
SIGHASH_NONE | ANYONECANPAY	0xC2 / 1100 0010	Sign its own input and no output
SIGHASH_SINGLE | ANYONECANPAY	0xC3 / 1100 0011	Sign its own input and the output with the same index

A transaction input has the following raw hexidecimal data: b272ec0ffa4cfd1f3446d87927004fa97177cb1569cf2008c57360a584306062320000006b483045022100c80b04357fd4daf4a0a8743bee485e40181ddc47ec81307dc1e9756ef6becc0402200d834912b5e7d071581d49373682130cd9a1f293f0552ac0194c25e7741107b04121020824bb65d1cc92de2a37410e4279211a0d53788140a528b17f7ada7f4ad8a9a9ffffffff What is the index of the UTXO being consumed in the transaction, what is the byte length of the DER signature (excluding SIGHASH flag) and which SIGHASH flag was used?

• 32, 106 , SIGHASH_ALL

• 32, 71, SIGHASH_SINGLE

• 50, 70, SIGHASH_ALL|SIGHASH_ANYONECANPAY

• 50, 71, SIGHASH_ALL

• 50, 106, SIGHASH_NONE

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