A spam phone number database on solana blockchain, for app SpamBlocker

• Instant query
  • Query a number on the fly.
• Offline check
  • Download numbers reported in the last N days to the local database. (1<= N <= 60)
• Reporting
  • Report a number as spam with category.
• Privacy
  • No account required, no email registration. Just generate a wallet locally.

• Ethereum
  • only ~15 TPS(transaction per second), too low for reporting numbers
• Solana
  • current solution, 400~65000 TPS
• Sui
  • yet to learn
• IPFS
  • too slow for instant query

• Use testnet instead of mainnet to avoid transaction fee...
• Schedule a daily workflow to airdrop 1 SOL when the balance < 1 SOL.

• Support SHA1, store/query a number's SHA1 hash instead of the plain number.