Each transaction on the blockchain is identified by a transaction hash. This is the unique identifier of a transaction. You can find your transaction hash in your application that you use to manage your Ehtereum or Gnosis Chain address (MetaMask, RealT Wallet, etc.) or directly on a blockchain explorer as displayed below.
Please note the transaction hash is only generated automatically after the RealTokens are sent back.
Here is an example where the transaction hash is indicated on Etherscan (Ethereum):
Here is an example where the transaction hash is indicated on Blockscout (Gnosis Chain):