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Assume the ring size = 11.

If I have 1 input, 10 decoys are added. 1 key image.

If I have N input, 11 - N decoys are added. N key image.

Is the above statement true?

Does it mean that if the number of inputs increases, there is less privacy?

1 Answer 1

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What is the max no of input for Monero tx?

The only restriction affecting the quantity of inputs a tx can include is the overall tx size maximum, 149.4kB [src].

How does it affect the no of decoys?

Each input has its own ring. Thus for each input being spent there is the input itself, 10 decoys and 1 key image.

Does it mean that if the number of inputs increases, there is less privacy?

No. See previous point.

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  • i check the xmr block explorer. Is it 1 input is approx 830 bytes, 1 output is 472 bytes?
    – Cisco Mmu
    Commented Jun 15, 2020 at 12:28
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    I believe CRYPTONOTE_MAX_TX_SIZE can never be reached, since get_transaction_weight_limit() will always return 149.4kB.
    – koe
    Commented Jun 15, 2020 at 14:17
  • @koe good spot. I'll update.
    – jtgrassie
    Commented Jun 15, 2020 at 17:10
  • @CiscoMmu very roughly speaking, yes, each additional input adds ~800 bytes. Outputs, much less. See this answer.
    – jtgrassie
    Commented Jun 15, 2020 at 18:08

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