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Normal Operation

State Notation	Signer State
`H[] C[]`	no holder commitment, no counterparty commitment
`H[0] C[0]`	holder initial commitment, counterparty initial commitment
`H[n] C[m]`	holder commitment n, counterparty commitment m
`H[n,n+1] C[m]`	holder commitment n and n+1, counterparty commitment m
`H[n]*`	holder base commitment, splice, and RBF candidates for n
`H[n,n+1]*`	holder base commitment, splice, and RBF candidates for n and n+1

sequenceDiagram
    autonumber

    participant Signer-A
    participant Node-A
    participant Node-B
    participant Signer-B

    par
        %% Node-A initiated, nantucket red
        rect rgb(254, 126, 136)

            activate Node-A
            Note over Node-A: Update Node B's Commitment
            Note over Signer-A: H[n] C[m]
            Node-A->>+Signer-A: SignCounterpartyCommitment(m+1)
            Signer-A-->>-Node-A: 
            Note over Signer-A: H[n] C[m,m+1]

            Node-A->>+Node-B: commitment_signed(m+1)

            Note over Signer-B: H[m] C[n]
            Node-B->>+Signer-B: ValidateHolderCommitment(m+1)
            Signer-B-->>-Node-B: 
            Note over Signer-B: H[m,m+1] C[n]

            Note over Node-B: persist H[m+1]

            Node-B->>+Signer-B: RevokeHolderCommitment(m)
            Signer-B-->>-Node-B: 
            Note over Signer-B: H[m+1] C[n]

            Node-B->>Node-A: revoke_and_ack(m)

            deactivate Node-B
            Node-A->>+Signer-A: ValidateCounterpartyRevocation(m)
            Signer-A-->>-Node-A: 
            Note over Signer-A: H[n] C[m+1]
            deactivate Node-A

        end
    and
        %% Node-B initiated, soft teal
        rect rgb(143, 188, 187)

            activate Node-B
            Note over Node-B: Update Node A's Commitment
            Note over Signer-B: H[m] C[n]
            Node-B->>+Signer-B: SignCounterpartyCommitment(n+1)
            Signer-B-->>-Node-B: 
            Note over Signer-B: H[m] C[n,n+1]

            Node-B->>+Node-A: commitment_signed(n+1)

            Note over Signer-A: H[n] C[m]
            Node-A->>+Signer-A: ValidateHolderCommitment(n+1)
            Signer-A-->>-Node-A: 
            Note over Signer-A: H[n,n+1] C[m]

            Note over Node-A: persist H[n+1]

            Node-A->>+Signer-A: RevokeHolderCommitment(n)
            Signer-A-->>-Node-A: 
            Note over Signer-A: H[n+1] C[m]

            Node-A->>Node-B: revoke_and_ack(n)

            deactivate Node-A
            Node-B->>+Signer-B: ValidateCounterpartyRevocation(n)
            Signer-B-->>-Node-B: 
            Note over Signer-B: H[m] C[n+1]
            deactivate Node-B

        end
    end

Normal Operation

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