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Centrifuge ZK NFT Demo
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| # See: https://github.com/centrifuge/zk-nft-demo-contract/blob/5ef74b64a9500937a26a0a3abc4db7539c39c2b8/src/circuit/nft.code#L45-L82 | |
| def main(field[2] creditRatingRootHashField, field buyerRatingField, privatefield[160] buyerID, privatefield[256] buyerPubkey, privatefield[2] directionCreditRatingTree, privatefield[256] creditRatingTreeDigest0, privatefield[256] creditRatingTreeDigest1, field nftAmount, field[2] documentRootHashField, privatefield[256] invoiceAmountValue, privatefield[64] invoiceAmountProperty, privatefield[256] invoiceAmountSalt, privatefield[8] invoiceAmountTreeDirection, privatefield[256] invoiceAmountTreeDigests0, privatefield[256] invoiceAmountTreeDigests1, privatefield[256] invoiceAmountTreeDigests2, privatefield[256] invoiceAmountTreeDigests3, privatefield[256] invoiceAmountTreeDigests4, privatefield[256] invoiceAmountTreeDigests5, privatefield[256] invoiceAmountTreeDigests6, privatefield[256] invoiceAmountTreeDigests7, privatefield[160] invoiceBuyerValue, privatefield[64] invoiceBuyerProperty, privatefield[256] invoiceBuyerSalt, privatefield[8] invoiceBuyerTreeDirection, privatefield[256] invoiceBuyerTreeDigests0, privatefield[256] invoiceBuyerTreeDigests1, privatefield[256] invoiceBuyerTreeDigests2, privatefield[256] invoiceBuyerTreeDigests3, privatefield[256] invoiceBuyerTreeDigests4, privatefield[256] invoiceBuyerTreeDigests5, privatefield[256] invoiceBuyerTreeDigests6, privatefield[256] invoiceBuyerTreeDigests7, privatefield[2] SignatureR, privatefield SignatureS, privatefield[2] BuyerPubKey) -> (field): | |
| context = context() | |
| field[128] creditRatingRootHash0 = unpack128(creditRatingRootHashField[0]) | |
| field[128] creditRatingRootHash1 = unpack128(creditRatingRootHashField[1]) | |
| field[256] creditRatingRootHash = [...creditRatingRootHash0, ...creditRatingRootHash1] | |
| // Verifies that the buyer is in the registry and the score matches | |
| field[254] buyerRatingFieldBits = split(buyerRatingField) | |
| field[8] buyerRating = buyerRatingFieldBits[246..254] | |
| field[512] buyerRatingProofValue = concatBuyerRatingProofValue(buyerID, buyerPubkey, buyerRating) | |
| field[256] leafCreditRatingTree = sha512(buyerRatingProofValue[0..256], buyerRatingProofValue[256..512]) | |
| field ratingTreeResult = verifyMerkleHash2(creditRatingRootHash, leafCreditRatingTree, directionCreditRatingTree, creditRatingTreeDigest0, creditRatingTreeDigest1) | |
| // Verfies that the document is owned by the buyer | |
| field[128] documentRootHash0 = unpack128(documentRootHashField[0]) | |
| field[128] documentRootHash1 = unpack128(documentRootHashField[1]) | |
| field[256] documentRootHash = [...documentRootHash0, ...documentRootHash1] | |
| field[1024] invoiceAmountTreeValue = concatInvoiceAmountLeaf(invoiceAmountProperty, invoiceAmountValue, invoiceAmountSalt) | |
| a, b, c, d = splitTo256bitChunks(invoiceAmountTreeValue) | |
| field[256] leafInvoiceAmountTree = sha1024(a, b, c, d) | |
| field invoiceAmountTreeResult = verifyMerkleHash8(documentRootHash, leafInvoiceAmountTree, invoiceAmountTreeDirection, invoiceAmountTreeDigests0, invoiceAmountTreeDigests1, invoiceAmountTreeDigests2, invoiceAmountTreeDigests3, invoiceAmountTreeDigests4, invoiceAmountTreeDigests5, invoiceAmountTreeDigests6, invoiceAmountTreeDigests7) | |
| field[1024] invoiceBuyerTreeValue = concatInvoiceBuyerLeaf(invoiceBuyerProperty, invoiceBuyerValue, invoiceBuyerSalt) | |
| a, b, c, d = splitTo256bitChunks(invoiceBuyerTreeValue) | |
| field[256] leafInvoiceBuyerTree = sha1024(a, b, c, d) | |
| field invoiceBuyerTreeResult = verifyMerkleHash8(documentRootHash, leafInvoiceBuyerTree, invoiceBuyerTreeDirection, invoiceBuyerTreeDigests0, invoiceBuyerTreeDigests1, invoiceBuyerTreeDigests2, invoiceBuyerTreeDigests3, invoiceBuyerTreeDigests4, invoiceBuyerTreeDigests5, invoiceBuyerTreeDigests6, invoiceBuyerTreeDigests7) | |
| // Ensures that the signature is valid | |
| field[256] padding = [0; 256] | |
| field isVerified = verifyEddsa(SignatureR, SignatureS, BuyerPubKey, documentRootHash, padding, context) | |
| // NFT amount needs to be smaller than invoice amount | |
| invoiceAmountValueField = pack256(invoiceAmountValue) | |
| field out = if invoiceAmountValueField > nftAmount then 1 else 0 fi | |
| return out |
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