Feature/373 nft transfer history#557
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Samuel1-ona merged 2 commits intoJun 30, 2026
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Add persistent transfer history for each NFT to enable provenance tracking. The implementation: - TransferRecord struct: stores from (Option<Address>, None for mint), to (Address), and timestamp (u64) - MAX_TRANSFER_HISTORY = 20 bounded storage per NFT via Vec trimming - Storage::save_transfer_record / Storage::get_transfer_history in storage.rs using THST key prefix - Mint recorded as first transfer (from = None) in mint_reward_nft_impl - Each transfer_nft call appends a record with from = Some(previous_owner) - get_nft_transfer_history(nft_id) public query returning Vec<TransferRecord> Closes Samuel1-ona#373
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closes #373