Protocol Proposals

What is up next: Short Listed

Stronger network semantics

Enabling invariants at the protocol level
https://github.com/stellar/stellar-protocol/issues/125

Base reserve requirement for data fields is not sufficient for preventing the bloat
https://github.com/stellar/stellar-protocol/issues/112

Order book improvements

CoSigned Assets
https://github.com/stellar/stellar-protocol/issues/146

Expiring offers
https://github.com/stellar/stellar-protocol/issues/175

Indivisible Assets
https://github.com/stellar/stellar-protocol/issues/113

Allow buy offers
https://github.com/stellar/stellar-protocol/issues/180

Payment channels and other "smart contracts"

Signatures or preauthorizations specifying flexible sequence numbers (so order doesn't matter)
https://github.com/stellar/stellar-protocol/issues/88

Ability to create accounts with predefined signers and predictable sequence numbers
https://github.com/stellar/stellar-protocol/issues/99

Non-atomic operations
It would be helpful if there were a way to have a single failed Payment operation (because the destination account does not exist) or failed CreateAccount operation (because the account already exists) not cause all other operations to fail.

Improve Issuer Experience

Allow sending account to add trustline on receiving account
https://github.com/stellar/stellar-protocol/issues/188