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I would like to know is there a limit after which a miner cannot include a transaction into his block.

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Each transaction can only be included into one block since it spends the coins (outputs) of the origin address. Including it in a second block would be invalid because the coins are already spent.

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  • it says that in order to see that your transaction is definitely validated, i'ts a good practice to wait for 6 confirmations. Something is obscure at this level. Does that mean that you have to wait for 6 blocks to be added to the blockchain. – user114154 Jan 15 at 17:44
  • Yes transaction is only included in one block. This is 1 confirmation. All miners then use this block hash in their next block header. Next block mined makes confirmation count 2 and that's how number of confirmations keep increasing for a transaction but it was included only in one block. – Prayank Jan 15 at 18:32
  • This transaction was included in block 666206: blockstream.info/tx/… had 1 confirmation while writing this comment. Confirmations will keep increasing as we see more blocks mined. – Prayank Jan 15 at 18:35
  • Since a later block can only be valid if all content of all prior blocks was valid, each block makes a transaction harder to change. Therefore, we count additional blocks as additional "confirmations" of events included in prior blocks. – Murch Jan 15 at 20:20

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