Smart Contract Code - https://gist.github.com/ankitzm/aab36f91fb12ce3c094b4b3a41a5e553#file-contracts-proofofbuilding-sol
Deployed Contract - https://mumbai.polygonscan.com/address/0x5547c16e81b782d626395faac1aee47f93691cda
OpenSea link(collection) - https://testnets.opensea.io/collection/proof-of-building