<p>I notice that many coinbase transactions(like in block 720,815) with locktime=0x00000000 and sequence=0xFFFFFFFF, which means UTXO could be spent immediately.
There seems to be no limit to coinbase's immediate use.</p>

CC BY-SA 4.0
2022-01-29T13:03:49.760Z
duplicate of https://bitcoin.stackexchange.com/questions/1991/what-is-the-block-maturation-time
Mike D
CC BY-SA 4.0
2022-01-29T14:26:22.473Z
Does this answer your question? [What is the block maturation time?](https://bitcoin.stackexchange.com/questions/1991/what-is-the-block-maturation-time)
Pieter Wuille
CC BY-SA 4.0
2022-01-30T02:31:17.043Z
I know there is a block maturation time, i just don't understand how to implement it? when nodes verify UTXO, is there extra step to verify coinbase UTXO height ?  why don't just use CLTV or CSV ?
KHJUAF403456ZS3K564WAEF
CC BY-SA 4.0
2022-01-30T06:33:12.227Z
Coinbase maturity is verified here: https://github.com/bitcoin/bitcoin/blob/master/src/consensus/tx_verify.cpp#L182
bordalix
<coinbase-transaction><locktime>
Coinbase transaction UTXOs are prohibited until 100 confirmed? By what?
KHJUAF403456ZS3K564WAEF
# Coinbase transaction UTXOs are prohibited until 100 confirmed? By what?

(Asked by: username_0 on 2022-01-29)

I notice that many coinbase transactions(like in block 720,815) with locktime=0x00000000 and sequence=0xFFFFFFFF, which means UTXO could be spent immediately.
There seems to be no limit to coinbase's immediate use.

**Tags:** coinbase-transaction, locktime

> **Comments:**
> **username_1**: duplicate of https://bitcoin.stackexchange.com/questions/1991/what-is-the-block-maturation-time  
> **username_2**: Does this answer your question? [What is the block maturation time?](https://bitcoin.stackexchange.com/questions/1991/what-is-the-block-maturation-time)  
> **username_0**: I know there is a block maturation time, i just don't understand how to implement it? when nodes verify UTXO, is there extra step to verify coinbase UTXO height ?  why don't just use CLTV or CSV ?  
> **username_3**: Coinbase maturity is verified here: https://github.com/bitcoin/bitcoin/blob/master/src/consensus/tx_verify.cpp#L182  

---

## 0 answers

