Good morning Antoine,

> While approaching this question, I think you should consider economic weight 
> of nodes in evaluating miner consensus-hijack success. Even if you expect a 
> disproportionate ratio of full-nodes-vs-SPV, they may not have the same  
> economic weight at all, therefore even if miners are able to lure a majority 
> of SPV clients they may not be able to stir economic nodes. SPV clients users 
> will now have an incentive to cancel their hijacked history to stay on the 
> most economic meaningful chain. And it's already assumed, that if you run a 
> bitcoin business or LN routing node, you do want to run your own full-node.

One hope I have for Lightning is that it will replace centralized custodial 
services, because:

* Lightning gains some of the scalability advantage of centralized custodial 
services, because you can now transfer to any Lightning client without touching 
the blockchain, for much reduced transfer fees.
* At the same time, it retains your-keys-your-coins noncustodiality, because 
every update of a Lightning channel requires your keys to sign off on it.

If most Lightning clients are SPV, then if we compare these two worlds:

* There are a few highly-important centralized custodial services with 
significant economic weight running fullnodes (i.e. now).
* There are no highly-important centralized custodial services, and most 
everyone uses Lightning, but with SPV (i.e. a Lightning future).

Then the distribution of economic weight would be different between these two 
It may even be possible, that the Lightning future with massive SPV might end 
up with more economic weight in SPV nodes, than in the world without Lightning 
and dependent on centralized custodial services to scale.

It is also entirely possible that custodial services for Lightning will arise 
anyway and my hope is already dashed, come on universe, work harder will you, 
would you really disappoint some randomly-generated Internet person like that.

> I agree it may be hard to evaluate economic-weight-to-chain-backend segments, 
> specially with offchain you disentangle an onchain output value from its real 
> payment traffic. To strengthen SPV, you may implement forks detection and 
> fallback to some backup node(s) which would serve as an authoritative source 
> to arbiter between branches. Such backup node(s) must be picked up manually 
> at client initialization, before any risk of conflict to avoid Reddit-style 
> of hijack during contentious period or other massive social engineering. You 
> don't want autopilot-style of recommendations for picking up a backup nodes 
> and avoid cenralization of backups, but somehow a uniform distribution. A 
> backup node may be a private one, it won't serve you any data beyond headers, 
> and therefore you preserve public nodes bandwidth, which IMO is the real 
> bottleneck. I concede it won't work well if you have a ratio of 1000-SPV for 
> 1-full-node and people are not effectively able to pickup a backup among 
> their social environment.
> What do you think about this model ?

Money makes the world go round, so such backup servers that are publicly-facing 
rather than privately-owned should be somehow incentivized to do so, or else 
they would not exist in the first place.
Of course, a free market tends towards monopoly, because any entity that 
happens to have even a slight advantage at the business will have more money to 
use towards business reinvestment and increase its advantage further, until 
they beat the competition to dust, anyone who has won a 4X game knows to search 
for and stack those little advantages until you snowball and conquer the 
world/galaxy/petri dish which is why the endgame of 4X games is so boring 
compared to the start, we have seen this happen in mining and exchanges and so 
on, and this works against your desire to have a uniform distribution.

If everyone runs such a privately-owned server, on the other hand, this is not 
so different from having a Lightning node you run at your home that has a 
fullnode as well and which you access via a remote control mobile device, and 
it is the inconvenience of having such a server at your home that prevents this 
in the first place.

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