Service: Commitment Model

[nkostoulas]

The Commitment Model will replace the latest Ocean hash being used so far for attestations. This will incorporate the hashes from all clients into a merle tree. Template:

type Commitment struct {
 commitments type map < position , hash >
 root type hash
 updated type bool
}
GetRoot() // calculate and update merkle root
GetHashForPosition(position) // get hash at position
UpdateHash(position, hash) // update commitments and trigger root update

Changes required:

• Commitment model

• Merkle tree util and testing

• Attestation model to move from Hash to Commitment

• AttestService to request/store/use Commitment instead of hash

• Server to store latest Commitment not Hash per client

• Commitment proofs