It's absolutely enormous. Was it revealed why it's used?

This is a Minergate block:


This is a regular pool block: http://explore.moneroworld.com/tx/7cddf2da09ec9c890d14ad18b9df7d4cd88e96103a739760a06dc5f91541ba05

Notice in the Minergate block there is this huge tx extra thing: 01c4230d59c83b3042fd82999cfda5be6b77c1673d9442d1f21c7ab9215bdc6c18021198414900000000000000000000000000000321004bff195014248ae22838853bcf293b8945f9baaac693c2d05bafe2f0f3e6c69e

  • Could you supply an example ?
    – user36303
    Jan 26 '18 at 11:58
  • @user36303 added
    – Joss Bird
    Jan 28 '18 at 12:36
  • I was thrown off by the "enormous", I thought you had found something else :) I added a partial answer.
    – user36303
    Jan 28 '18 at 15:20
  • @user36303 whoops sorry
    – Joss Bird
    Jan 28 '18 at 15:22

The extra payload appears to be for merged mining, as per the definitions in src/cryptonote_basic/tx_extra.h: field 0: extra pub key: <c4230d59c83b3042fd82999cfda5be6b77c1673d9442d1f21c7ab9215bdc6c18> field 1: extra nonce: 9841490000000000000000000000000000 field 2: extra merge mining tag: depth 0, merkle root <4bff195014248ae22838853bcf293b8945f9baaac693c2d05bafe2f0f3e6c69e> I believe XDN was switching to merge mining with Monero, so it could be this. XDN was abandoned a year ago though. Fantomcoin was also merged mined, but has been dead even longer.

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