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@ -50,6 +50,48 @@ minimum time after proof-of-publication. This enables a wide variety
of applications in phased protocols such as escrow, payment channels, of applications in phased protocols such as escrow, payment channels,
or bidirectional pegs. or bidirectional pegs.
===Examples===
====Escrow with Timeout====
An escrow that times out automatically 30 days after being funded can be
established in the following way. Alice, Bob and Escrow create a 2-of-3
address with the following redeemscript.
IF
2 <Alice's pubkey> <Bob's pubkey> <Escrow's pubkey> 3 CHECKMULTISIGVERIFY
ELSE
<LOCKTIME_THRESHOLD + 30*24*60*60> CHECKSEQUENCEVERIFY DROP
<Alice's pubkey> CHECKSIGVERIFY
ENDIF
At any time funds can be spent using signatures from any two of Alice,
Bob or the Escrow.
After 30 days Alice can sign alone.
The clock does not start ticking until the payment to the escrow address
confirms.
====Payment Channel Revokation====
Scriptable relative locktime provides a predictable amount of time to respond in
the event a counterparty broadcasts a revoked transaction: Absolute locktime
necessitates closing the channel and reopen it when getting close to the timeout,
whereas with relative locktime, the clock starts ticking the moment the
transactions confirms in a block. It also provides a means to know exactly how
long to wait (in number of blocks) before funds can be pulled out of the channel
in the event of a noncooperative counterparty.
====Hash Time-Locked Contracts====
Hashed Timelock Contracts (HTLCs) can be used to create chains of payments which
is required for lightning network payment channels. The scheme requires both
CHECKSEQUENCEVERIFY and CHECKLOCKTIMEVERIFY to enforce HTLC timeouts and
revokation.
==Specification== ==Specification==
@ -155,49 +197,6 @@ semantics and detailed rationale for those semantics.
} }
==Examples==
===Escrow with Timeout===
An escrow that times out automatically 30 days after being funded can be
established in the following way. Alice, Bob and Escrow create a 2-of-3
address with the following redeemscript.
IF
2 <Alice's pubkey> <Bob's pubkey> <Escrow's pubkey> 3 CHECKMULTISIGVERIFY
ELSE
<LOCKTIME_THRESHOLD + 30*24*60*60> CHECKSEQUENCEVERIFY DROP
<Alice's pubkey> CHECKSIGVERIFY
ENDIF
At any time funds can be spent using signatures from any two of Alice,
Bob or the Escrow.
After 30 days Alice can sign alone.
The clock does not start ticking until the payment to the escrow address
confirms.
===Payment Channel Revokation===
Scriptable relative locktime provides a predictable amount of time to respond in
the event a counterparty broadcasts a revoked transaction: Absolute locktime
necessitates closing the channel and reopen it when getting close to the timeout,
whereas with relative locktime, the clock starts ticking the moment the
transactions confirms in a block. It also provides a means to know exactly how
long to wait (in number of blocks) before funds can be pulled out of the channel
in the event of a noncooperative counterparty.
===Hash Time-Locked Contracts===
Hashed Timelock Contracts (HTLCs) can be used to create chains of payments which
is required for lightning network payment channels. The scheme requires both
CHECKSEQUENCEVERIFY and CHECKLOCKTIMEVERIFY to enforce HTLC timeouts and
revokation.
==Reference Implementation== ==Reference Implementation==
A reference implementation is provided in the following git repository: A reference implementation is provided in the following git repository: