Contest is over, Second winner.
To mods: I am not sure about right board for this.
This is english translation of my russian topic.

The goal is to send a transaction that will be the last in a block. There will be two winners: the one who will do it first and the one who will do it last (but until 15:00 UTC, March 25).

Rules:
1. All transactions should have output to the address 1GZaDcDTBbSHq3URfUn9gitqD6TFoLcd27. The amount does not matter - at least 1 sat. All these transactions will be visible in the blockchain in real time!
2. If the transaction fits (1) and is the last in any block - this is a candidate for prize. The order of transactions in the block can be viewed, for example, here: https://bitaps.com/567610.
3. Of all the candidates, two receive prizes: the first by block number and the last by block number. The last block should be created before 15:00 UTC on March 25. The first winner gets 0.005 btc, and the last one gets 0.005btc and private key for 1GZaDcDTBbSHq3URfUn9gitqD6TFoLcd27.
4. The winners will somehow prove that these transactions are their: signed message, OP_RETURN,.. - any proof.

The idea of ​​the competition was proposed by amaclin1 (post in russian).

One winner is already determined (post in russian), but you can win second prize!

New last transactions:
568716 transaction
568732 transaction

Contest is over!

Winner's tx: 93a1c4dbcdecbdf45a3c55e87f9749cca2d47631f41ea1588986688af2b15b4f.

Congrats!

If winner will not reply within a day, I will transfer the prize to his address bc1qxj6x782u2tzrejh3qztspyer7kp26apcc2p8dc