<p>The original Bitcoin software (and even the current Bitcoin Core) always used a new private key (and thus public key) for every transaction. Keys were never reused. Since the Coinbase transaction for each block is a new transaction, the software would use a new key for each one. It is the same behavior as asking for a new receiving address; a new one will be generated and given to you.</p>

CC BY-SA 4.0
2018-08-28T15:21:08.087Z
Do you mean there is no chance to connect the “same account” in blocks? If the software generate a new address for every transaction how could people have a stable address for use in the site like blockchain.info?
Carpemer
CC BY-SA 4.0
2018-08-28T15:23:39.320Z
Bitcoin does not use accounts. It is actually possible to determine whether blocks were mined by the same person, but not through the keys themselves.
Ava Chow
CC BY-SA 4.0
2018-08-28T15:28:01.683Z
Actually I mean address above. Through what?
Carpemer
CC BY-SA 4.0
2018-08-28T15:37:25.547Z
You can look at things like the extranonce (in the coinbase script of the coinbase transaction). Even though the software generates a new address everytime you want to receive, addresses are reusable. They do not expire and can be sent to multiple times. It is just not advisable and almost no modern wallet will give you the same address multiple times even though they can be reused.
Ava Chow
CC BY-SA 4.0
2018-08-28T23:32:03.340Z
My understanding is the coinbase' input script is arbitrary, do you mean we could collect the coinbase which have the script like this as satoshi's coinbase?
04 -> PUSH 4  bytes (FFFF001D)
01 -> PUSH 1  byte  (04), described in 
https://bitcoin.stackexchange.com/questions/9918/how-is-the-encoding-of-extranonce-done-in-the-genesis-block
Carpemer
CC BY-SA 4.0
2018-08-28T23:53:03.973Z
No, more people than just satoshi used those kinds of scripts because that was the default behavior in the original Bitcoin client. However you can look at the numbers, and due to a quirk of how the original Bitcoin client worked, the number that is pushed will increase for each block that was mined by the same person in the same mining session.
Ava Chow
CC BY-SA 4.0
2018-08-29T04:32:39.530Z
Thanks! I believe I will never understand this without the help of bitcoin expert like you.
Carpemer
CC BY-SA 4.0
2018-08-29T14:42:43.043Z
But now many pool looks use the same address. in the coinbase. For example:
https://www.blockchain.com/btc/tx/29aa3c778e2e8d99545441f6602a07a00e2214b1980713e4f09ad62279f88caa
https://www.blockchain.com/btc/tx/b80030e5ea1adc68fe2e134480d75cfa9289a7b237f41f8cea952c1c14a2d60e
Carpemer
CC BY-SA 4.0
2018-08-28T14:58:54.083Z
2018-08-28T14:58:54.083Z
Ava Chow
<p>A miner creates the coinbase transaction, which can have any valid payment address. So, it could be that there were multiple miners running, or that the miner was changing payment addresses.</p>

CC BY-SA 4.0
2018-08-28T14:49:24.073Z
2018-08-28T14:49:24.073Z
JBaczuk
<p>For example: the pubkey in the first 3 coinbase's output are</p>

<ol>
<li><p>04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f</p></li>
<li><p>0496b538e853519c726a2c91e61ec11600ae1390813a627c66fb8be7947be63c52da7589379515d4e0a604f8141781e62294721166bf621e73a82cbf2342c858ee  </p></li>
<li><p>047211a824f55b505228e4c3d5194c1fcfaa15a456abdf37f9b9d97a4040afc073dee6c89064984f03385237d92167c13e236446b417ab79a0fcae412ae3316b77</p></li>
</ol>

<p>Actually, I checked the first 6k transaction, most of the pubKey in the pay-to-pubkey script is different, less than 10 pubKeys have duplications.
Is that means satoshi use multi miner jobs to mine the block at the beginning or anything I misunderstood?</p>

<p>The reference link is here.
block0:
<a href="https://www.blockchain.com/btc/tx/4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b" rel="nofollow noreferrer">https://www.blockchain.com/btc/tx/4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b</a>
block1:
<a href="https://www.blockchain.com/btc/tx/0e3e2357e806b6cdb1f70b54c3a3a17b6714ee1f0e68bebb44a74b1efd512098" rel="nofollow noreferrer">https://www.blockchain.com/btc/tx/0e3e2357e806b6cdb1f70b54c3a3a17b6714ee1f0e68bebb44a74b1efd512098</a>
block2:
<a href="https://www.blockchain.com/btc/tx/9b0fc92260312ce44e74ef369f5c66bbb85848f2eddd5a7a1cde251e54ccfdd5" rel="nofollow noreferrer">https://www.blockchain.com/btc/tx/9b0fc92260312ce44e74ef369f5c66bbb85848f2eddd5a7a1cde251e54ccfdd5</a></p>

<transactions><block><public-key><p2pk>
Why most of pubkeys in the first batch of blocks in blk00000.dat are different
Carpemer
# Why most of pubkeys in the first batch of blocks in blk00000.dat are different

(Asked by: username_0 on 2018-08-28)

For example: the pubkey in the first 3 coinbase's output are

1. 04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f
2. 0496b538e853519c726a2c91e61ec11600ae1390813a627c66fb8be7947be63c52da7589379515d4e0a604f8141781e62294721166bf621e73a82cbf2342c858ee
3. 047211a824f55b505228e4c3d5194c1fcfaa15a456abdf37f9b9d97a4040afc073dee6c89064984f03385237d92167c13e236446b417ab79a0fcae412ae3316b77

Actually, I checked the first 6k transaction, most of the pubKey in the pay-to-pubkey script is different, less than 10 pubKeys have duplications.
Is that means satoshi use multi miner jobs to mine the block at the beginning or anything I misunderstood?

The reference link is here.
block0:
<https://www.blockchain.com/btc/tx/4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b>
block1:
<https://www.blockchain.com/btc/tx/0e3e2357e806b6cdb1f70b54c3a3a17b6714ee1f0e68bebb44a74b1efd512098>
block2:
<https://www.blockchain.com/btc/tx/9b0fc92260312ce44e74ef369f5c66bbb85848f2eddd5a7a1cde251e54ccfdd5>

**Tags:** transactions, block, public-key, p2pk


---

## 2 answers

### Answer by username_1 on 2018-08-28. Score: 3 | Accepted answer

The original Bitcoin software (and even the current Bitcoin Core) always used a new private key (and thus public key) for every transaction. Keys were never reused. Since the Coinbase transaction for each block is a new transaction, the software would use a new key for each one. It is the same behavior as asking for a new receiving address; a new one will be generated and given to you.

> **Comments:**
> **username_0**: Do you mean there is no chance to connect the “same account” in blocks? If the software generate a new address for every transaction how could people have a stable address for use in the site like blockchain.info?  
> **username_1**: Bitcoin does not use accounts. It is actually possible to determine whether blocks were mined by the same person, but not through the keys themselves.  
> **username_0**: Actually I mean address above. Through what?  
> **username_1**: You can look at things like the extranonce (in the coinbase script of the coinbase transaction). Even though the software generates a new address everytime you want to receive, addresses are reusable. They do not expire and can be sent to multiple times. It is just not advisable and almost no modern wallet will give you the same address multiple times even though they can be reused.  
> **username_0**: My understanding is the coinbase' input script is arbitrary, do you mean we could collect the coinbase which have the script like this as satoshi's coinbase? 04 -> PUSH 4  bytes (FFFF001D) 01 -> PUSH 1  byte  (04), described in  https://bitcoin.stackexchange.com/questions/9918/how-is-the-encoding-of-extranonce-done-in-the-genesis-block  
> **username_1**: No, more people than just satoshi used those kinds of scripts because that was the default behavior in the original Bitcoin client. However you can look at the numbers, and due to a quirk of how the original Bitcoin client worked, the number that is pushed will increase for each block that was mined by the same person in the same mining session.  
> **username_0**: Thanks! I believe I will never understand this without the help of bitcoin expert like you.  
> **username_0**: But now many pool looks use the same address. in the coinbase. For example: https://www.blockchain.com/btc/tx/29aa3c778e2e8d99545441f6602a07a00e2214b1980713e4f09ad62279f88caa https://www.blockchain.com/btc/tx/b80030e5ea1adc68fe2e134480d75cfa9289a7b237f41f8cea952c1c14a2d60e  

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### Answer by username_2 on 2018-08-28. Score: 0

A miner creates the coinbase transaction, which can have any valid payment address. So, it could be that there were multiple miners running, or that the miner was changing payment addresses.


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