| /** | |
| * Base contract that all upgradeable contracts should use. | |
| * | |
| * Contracts implementing this interface are all called using delegatecall from | |
| * a dispatcher. As a result, the _sizes and _dest variables are shared with the | |
| * dispatcher contract, which allows the called contract to update these at will. | |
| * | |
| * _sizes is a map of function signatures to return value sizes. Due to EVM | |
| * limitations, these need to be populated by the target contract, so the | |
| * dispatcher knows how many bytes of data to return from called functions. |
(That's my attempt to understand what problem Impulse solves and how. I am not a designer/developer of this scheme.)
Regular Bitcoin transactions are not guaranteed until mined sufficiently deep in the blockchain. Unconfirmed transactions can be observed nearly instantly, but they cannot be trusted (could drop out because of insufficient fees, or double-spent).
Impulse Overview