Summary:
To extend the NEP-171 events standard to include contract_metadata_update event.
Motivation:
The existing events standard for NFTs as described in NEP-171 does not include any events to be logged when an NFT contract’s metadata is updated.
This results in situations where, for instance, a contract owner will update the contract’s base_uri after it is initially deployed, likely a reference to a dedicated IPFS gateway, but none of the contract consumers (wallets, marketplaces etc) are aware of this change and continue serving the NFT media from less reliable/available gateways. A contract_metadata_update event would alert listeners of any change to contract metadata and enable them to remain up-to-date.
Specification
contract_metadata_update
Emitted by NFT contract when any field of NFTContractMetadata is updated. Includes fields that have been updated
EVENT_JSON:{
"standard": "nep171",
"version": "1.1.0",
"event": "contract_metadata_update",
"data": [{ "metadata": { "base_uri": "..." }}]
}