get https://api.zan.top/node/v1/eth/mainnet//eth/v1/validator/attestation_data
Produce an attestation data.
Requests that the beacon node produce an AttestationData.
A 503 error must be returned if the block identified by the response
beacon_block_root is optimistic (i.e. the attestation attests to a block
that has not been fully verified by an execution engine).