Thanks. Can u elaborate on how the 1BTC is locked? I assume after the commit & cast spell transactions, the 1BTC utxo is locked by the utxo holding BatchNFT and xBTC charms. BatchNFT and xBTC each have separate app, so we have 2 provers and later 2 verifiers to unlock then 1BTC? What is the difference between these 2 apps for the separate charm?

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When we scroll a bit to the right we see the retirement detail where the mint tx hash of the BatchNFT is displayed! And there it is, the connection between the BCT and the retired VCU by @VerraStandards @ToucanProtocol @bollibolETH

First we have to click on the VCU tab, than we can copy paste the serial number of the info of the BatchNFT into the "serial number block start" field at the registry. This gives us the exact retirement we were looking for!

When we open the contract page of the batchNFT and click on contract --> read as proxy, scroll down to 16.nftList we can put in the number of the NFT and get some extra information polygonscan.com/token/0x8a4d…

So lets take a look at that "fractionalize" TX: We see that there was a NFT involved. In toucan these are called BatchNFT and represent one bridging process. In this case we look at BatchNFT #934 polygonscan.com/tx/0xe7cfe01…

BCT tokens are called carbon reference tokens and are fungible. 1 BCT = ~$6 USD (coinmarketcap.com/currencies…) so I guess that's how an offset project gets paid: Verify (i.e. on Verra) -> BatchNFT -> fractionalize into TCO2 carbon tokens -> convert into carbon reference tokens -> $$$