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Channel Establishment

Channel Establishment Sequence

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

    activate Node-A
    Note over Node-A: Fund New Channel
    Node-A->>+Signer-A: NewChannel
    Signer-A-->>-Node-A: 

    Node-A->>Node-B: open_channel
    activate Node-B

    Node-B->>+Signer-B: NewChannel
    Signer-B-->>-Node-B: 

    Node-B->>Node-A: accept_channel

    Node-A->>+Signer-A: SetupChannel
    Signer-A-->>-Node-A: 
    Note over Signer-A: H[] C[]

    Node-A->>+Signer-A: SignCounterpartyCommitment(0)
    Signer-A-->>-Node-A: 
    Note over Signer-A: H[] C[0]

    Node-A->>Node-B: funding_created

    Node-B->>+Signer-B: SetupChannel
    Signer-B-->>-Node-B: 
    Note over Signer-B: H[] C[]

    Node-B->>+Signer-B: ValidateHolderCommitment(0)
    Signer-B-->>-Node-B: 
    Note over Signer-B: H[0] C[]

    Node-B->>+Signer-B: SignCounterpartyCommitment(0)
    Signer-B-->>-Node-B: 
    Note over Signer-B: H[0] C[0]

    Node-B->>Node-A: funding_signed

    Node-A ->>+Signer-A : ValidateHolderCommitment(0)
    Signer-A -->>-Node-A : 
    Note over Signer-A : H[0] C[0]

    Node-A ->>+Signer-A : SignOnchainTx
    Signer-A -->>-Node-A : 

    Node-A ->>+Signer-A : CheckOutpoint
    Signer-A -->>-Node-A : 

    Node-A->>Node-B: channel_ready

    Node-B  ->>+Signer-B  : CheckOutpoint
    Signer-B  -->>-Node-B  : 

    Node-B  ->>+Signer-B  : LockOutpoint
    Signer-B  -->>-Node-B  : 

    Node-B->>Node-A: channel_ready
    deactivate Node-B

    Node-A  ->>+Signer-A  : LockOutpoint
    Signer-A  -->>-Node-A  : 

    deactivate Node-A

Channel Establishment

Channel Establishment Sequence

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