Testnet - v1.6.2

This is a Testnet release. It is not recommended for Mainnet Beta

Changes

• Adds loader instruction and cli tooling for closing program buffer accounts
• solana cli now supports dumping the transaction message in sign-only mode
• RPC improvements:
  • getConfirmedBlock response data can now be limited via request args: transaction data may be full, just signatures, or skipped altogether; rewards info may be skipped
  • new getSlotLeaders endpoint
  • getBlockTime now returns the block time for any processed block (previously only finalized)
  • several endpoints now return confirmed data when specified with the commitment parameter (default finalized): getConfirmedBlock, getConfirmedBlocks, getConfirmedBlocksWithLimit, and getConfirmedTransaction
• Fixes pesky cli crash when calling solana epoch-info against non-RPC nodes
• Solana Ledger app settings now available via the remote-wallet crate
• Update BPF Toolchain to v1.4
• Program Test now properly handles duplicate accounts
• Improved handling of duplicate shreds
• solana-keygen grind can now output BIP39 mnemonics (see --use-mnemonic)

BREAKING CHANGES

• solana transfer will no longer transfer to an unfunded recipient by default to prevent accidental loss of funds. Add the --allow-unfunded-recipient flag to override

Updating to solana-program-test v1.6

See https://github.com/solana-labs/solana/wiki/Migrating-Rust-programs-from-v1.5-to-v1.6 for information on how to upgrade a Rust program from v1.5 to v1.6