What is the messageReceiptCount seemingly always zero from the Fuel Node graphql api?

Fuel Network
1

The docs say this value should be “The number of receipt messages in the block.”, however it appears to basically always be 0. What qualifies as a ‘receipt message root’?

query TransactionsThatHadReceipts {
  blocks(first: 1, after: "7723482") {
    edges {
      node {
        header {
          id
          transactionsCount
          height
          messageReceiptCount
        }
      }
    }
  }
}

As an example, this query is for a block with 2 transactions, and in total it has 34 receipts - 33 in this transaction and a mint in the other.

Infact, I didn’t find a block where this value wasn’t 0 - (although I didn’t scan every single block)

2

Message receipts are only generated during bridge withdrawals. The count is included in the header to help with generating withdrawal proofs. I just performed a withdrawal myself on testnet and the message receipt count seems accurate:

curl 'https://testnet.fuel.network/v1/graphql' -H 'Accept-Encoding: gzip, deflate, br' -H 'Content-Type: application/json' -H 'Accept: application/json' -H 'Connection: keep-alive' -H 'DNT: 1' -H 'Origin: https://testnet.fuel.network' --data-binary '{"query":"\n{\n  block(height:\"8752730\") {\n    header {\n      messageReceiptCount\n    }\n  }\n}\n"}' --compressed
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