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It was definitely on August 24th 2017, but not sure about the block number. Many sources reference block 481,822; but others state 481,824.

Also, even if this was the first block to allow segwit transactions, what was the first very block that contained one of them?

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  • I believe the first transaction is in block 481825, because this is the block where my parser fails.
    – Jus12
    Commented Dec 15, 2017 at 11:30

2 Answers 2

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This is a very old question but probably someone else needs to know the same:

SegWit was activated in block 481824 and that block has two p2wpkh txs:

dfcec48bb8491856c353306ab5febeb7e99e4d783eedf3de98f3ee0812b92bad in block 0000000000000000001c8018d9cb3b742ef25114f27563e3fc4a1902167f9893
f91d0a8a78462bc59398f2c5d7a84fcff491c26ba54c4833478b202796c8aafd in block 0000000000000000001c8018d9cb3b742ef25114f27563e3fc4a1902167f9893

I have to run my script against testnet in order to find the best p2wpk tx.

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  • 1
    So, block 481824 is the first block that could contain a SwgWit transaction according to consensus or is it just the first block that actually does?
    – Willtech
    Commented Feb 24, 2018 at 0:41
  • 1
    it is the first block that actually does. There is no mention of any specify block height in the segwit activation mechanism, there is a start time and a timeout time (a time frame) when it was possible to activate it. Take a look at the code github.com/bitcoin/bitcoin/blob/master/src/chainparams.cpp#L101
    – lontivero
    Commented Feb 24, 2018 at 4:56
  • I will try and find out exactly.
    – Willtech
    Commented Feb 24, 2018 at 6:49
  • According to this Question it was indeed block 481824.
    – Willtech
    Commented Feb 24, 2018 at 6:54
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    @lontivero just for others "now" is line github.com/bitcoin/bitcoin/blob/…
    – WebOrCode
    Commented Feb 26, 2023 at 10:33
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Blockchair indexes this BTW: https://blockchair.com/bitcoin/transactions?s=block_id(asc)&q=has_witness(true)#f=hash,block_id,input_count,output_count,time,output_total,output_total_usd,fee_usd,has_witness which confirms the 481,824. I filtered by "has witness" and sorted by block.

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