Can my music NFTs disappear? How secure is Pianity?

NFTs & permanent storage: collect Atomic NFTs

Pianity is a music NFT marketplace built on Arweave a new type of storage that backs data with sustainable and perpetual endowments.  

Atomic NFTs Offer a Permanent Alternative to Ethereum and IPFS. Because the music asset and the smart contract are immutably stored together on Arweave, our NFTs are forever stored on the blockchain and truly eternal.