The ledger of record is the set of all cryptographically signed...

- digital signatures
- hash functions
- blockchain timestamps
- Nakamoto consensus
- Merkle trees
- crypto oracles
Every new proof-of-X (like proof-of-location) expands the scope of what the ledger of record can prove.

Layer 0 (ie @bloXrouteLabs)
New Layer 1 (ie @withflow_)
Succinct (ie @CodaProtocol)
Build your own (ie Cosmos SDK)
State channels (ie @ConnextNetwork)
Sidechains (ie @poanetwork)
ZK rollup (ie @the_matter_labs)
en.wikipedia.org/wiki/Akashic_r…


