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BOLT2: Increase Bitcoin max chan size to 2^28-1 (~$10K) #579

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BOLT2: Increase Bitcoin max chan size to 2^28-1 (~$10K) #579

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8 changes: 5 additions & 3 deletions 02-peer-protocol.md
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Original file line number Diff line number Diff line change
Expand Up @@ -783,7 +783,7 @@ Fees") while maintaining its channel reserve.
- MUST NOT offer `amount_msat` below the receiving node's `htlc_minimum_msat`
- MUST set `cltv_expiry` less than 500000000.
- for channels with `chain_hash` identifying the Bitcoin blockchain:
- MUST set the four most significant bytes of `amount_msat` to 0.
- MUST set the seven most significant nibbles of `amount_msat` to 0.
- if result would be offering more than the remote's
`max_accepted_htlcs` HTLCs, in the remote commitment transaction:
- MUST NOT add an HTLC.
Expand All @@ -807,7 +807,7 @@ A receiving node:
- SHOULD fail the channel.
- if sending node sets `cltv_expiry` to greater or equal to 500000000:
- SHOULD fail the channel.
- for channels with `chain_hash` identifying the Bitcoin blockchain, if the four most significant bytes of `amount_msat` are not 0:
- for channels with `chain_hash` identifying the Bitcoin blockchain, if the seven most significant nibbles of `amount_msat` are not 0:
- MUST fail the channel.
- MUST allow multiple HTLCs with the same `payment_hash`.
- if the sender did not previously acknowledge the commitment of that HTLC:
Expand Down Expand Up @@ -843,7 +843,9 @@ seconds, and the protocol only supports an expiry in blocks.

`amount_msat` is deliberately limited for this version of the
specification; larger amounts are not necessary, nor wise, during the
bootstrap phase of the network.
bootstrap phase of the network. The amount was initially limited to the
four most significant bytes being 0, but was changed to limiting
the seven most significant nibbles being 0 on February 23, 2019.

### Removing an HTLC: `update_fulfill_htlc`, `update_fail_htlc`, and `update_fail_malformed_htlc`

Expand Down