PAX Gold (PAXG) vs Zcash (ZEC)

PAX Gold (PAXG) is an asset-backed token where one token should represent one fine troy ounce of a London Good Delivery gold bar, stored in professional vault facilities. Anyone who owns PAXG has ownership rights to that gold under the custody of Paxos Trust Company. Since PAXG represents physical gold, its value is tied directly to the real-time market value of that physical gold. PAXG gives customers the benefits of actual physical ownership of specific gold bars with the speed and mobility of a digital asset. Customers are able to have fractional ownership of physical bars. On the Paxos platform, customers can convert their tokens to allocated gold, unallocated gold, or fiat currency (and vice versa) quickly and efficiently, reducing their exposure to settlement risk. PAXG is also available for trading on Paxos’ itBit exchange. PAXG will also be available on other crypto-asset exchanges, wallets, lending platforms and elsewhere within the crypto ecosystem. At any time, PAXG holders can lookup the serial number, value and physical characteristics of their vaulted gold just by entering their Ethereum wallet address on the PAXG lookup tool on Paxos.com/paxgold.

Zcash is a decentralized and open-source cryptocurrency that offers privacy and selective transparency of transactions. Zcash payments are published on a public blockchain, but the sender, recipient, and amount of a transaction remain private. Zcash is based on peer-reviewed cryptographic research, and built by a security-specialized engineering team on an open source platform based on Bitcoin Core's battle-tested codebase. Our improvement over Bitcoin is the addition of privacy. Zcash uses advanced cryptographic techniques, namely zero-knowledge proofs, to guarantee the validity of transactions without revealing additional information about them. How Zcash works Zcash encrypts the contents of shielded transactions. Since the payment information is encrypted, the protocol uses a novel cryptographic method to verify their validity. Zcash uses a zero-knowledge proof construction called a zk-SNARK, developed by our team of experienced cryptographers based on recent breakthroughs in cryptography. These constructions allow the network to maintain a secure ledger of balances without disclosing the parties or amounts involved. Instead of publicly demonstrating spend-authority and transaction values, the transaction metadata is encrypted and zk-SNARKs are used to prove that nobody is cheating or stealing. Zcash also enables users to send public payments which work similarly to Bitcoin. With the support for both shielded and transparent addresses, users can choose to send Zcash privately or publicly. Zcash payments sent from a shielded address to a transparent address reveal the received balance, while payments from a transparent address to a shielded address protect the receiving value.