Sending Action
Explanation
There are many ways to get the signature signed by users. No matter which way NFT Data Chain will need the signature with a signed message, as shown below.
# Message used to sign
nft_schema_code: <schema_code> # required
token_id: <token_id> # optional, first one will be pick in case holder holds more than one
action: <action_name>
timestamp: <expired_datetime> # the expired time in epoch format. NFT Data Chain will validate at the runtime whether the signed message is expired or not.This is the protection to the users to ensure that no one can make a call on their behalf or use a signature on another action. But anyway, in this mode, the creator has complete control of the NFT, so the creator must verify this message by themselves.
Creator Backend System
Cause in this mode, the creator has complete control of NFT Data. The creator needs to verify incoming data by themselves. Needed verifications are:
Verify that the signer is the same as the NFT holder
Verify that the metadata on NFT Data Chain is up to date with origin data
Verify that action is correct
Verify that signature is not expired.
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