Verify

Cross Chain Transaction Verification#

This section provides guidance on verifying transactions across different blockchain chains, assuming that a side chain has already been deployed and indexed by the main chain.

Sending a Transaction#

Any transaction with the status "Mined" can be verified, provided that the transaction has been indexed.

Verifying the Transaction#

There are two scenarios for verification:

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rpc VerifyTransaction (VerifyTransactionInput) returns (google.protobuf.BoolValue) {
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  option (aelf.is_view) = true;
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}
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message VerifyTransactionInput {
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    aelf.Hash transaction_id = 1;
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    aelf.MerklePath path = 2;
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    int64 parent_chain_height = 3;
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    int32 verified_chain_id = 4;
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}

The VerifyTransaction method is used for verification and returns whether the transaction was mined and indexed by the destination chain. The method is the same for both scenarios; only the input values differ.

Verifying a Main Chain Transaction#

To verify a main chain transaction on a side chain, use the VerifyTransaction method on the side chain with the following input values:

You can retrieve the Merkle path of a transaction in a block by using the chain's API method GetMerklePathByTransactionIdAsync.

Verifying a Side Chain Transaction#

For verifying a side chain transaction:

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rpc GetBoundParentChainHeightAndMerklePathByHeight (google.protobuf.Int64Value) returns (CrossChainMerkleProofContext) {
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    option (aelf.is_view) = true;
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}
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message CrossChainMerkleProofContext {
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    int64 bound_parent_chain_height = 1;
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    aelf.MerklePath merkle_path_from_parent_chain = 2;
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}

Using the result from the above API, call VerifyTransaction on the target chain with:

Edited on: 18 July 2024 04:28:53 GMT+0