Execute plugin collects and transmits CCTPv2 attestations #1042
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Implements CCTP v2 token data observation for Chainlink CCIP.
Cross-Chain Transfer Protocol (CCTP) is Circle's protocol for transferring USDC natively across
blockchains.
Attestations are cryptographic proofs that validate cross-chain token transfers. When USDC is
burned on a source chain, Circle's attestation service provides signed attestations that can be
used to mint the equivalent amount on the destination chain. These attestations contain the
original message data and Circle's signature, proving the burn occurred.
The CCTPv2 Token Data Observer implemented in this PR iterates through a batch of CCIP messages, determines which messages' token transfers are CCTPv2 transfers, calls the Circle CCTPv2 API to fetch attestations, and converts the attestations to
TokenDatathat can be processed by on-chain contracts to mint the associated USDC.