@crysx
and other like minds...
I would suggest sticking with the exchange as it is model FIRST.
EXCEPTION ... like minded exchanges participate in a ARB pool so bids/offers can be pooled.
This allows for multiple custodial hands, lessens systematic risk.
NEXT step, coin communities offer MULTIsig cold storage (and book bid nodes), so an open source platform gets shared and is available to coin communities. [more multiple custodial hands, lessens systematic risk more, and coin communities sponsor these nodes] This expands vector points and the funds are in cold storage not hot wallets thus hardens the security layer bunkers. What do these nodes do? Participate in the above ARB pool but also are watchtowers of blockchain (limiting reorgs or alerting of a possible reorg), and unwind slower than direct or immediate settlement because cases of reorgs.
NEXT step, a joint venture coinmarketcap like facility to fast track ARB pool. [charts, spot api service]
NEXT look back into blocknet / waves like DEX projects.
https://komodoplatform.com/atomic-swaps/NEXT fund a unified dev project to integrate all the above solutions that are proven pure DEX, into a hold your own keys model. I think this is already possible, copy paste Steem/Golos federation type systems to provide exchange services for 100s of chains.
FINAL step all the above models can evolve into MULTIsig mechanisms to analyse bid/ask offers on the high capacity TPS federation chains to underwrite (insure) and arbitrate failed P2P settlements.
TLDR;
1. exchanges settlements POOLED
2. exchanges + coin-communities settlements POOLED
3. exchanges + coin-communities settlements POOLED +public API broadcast network
4. exchanges + coin-communities settlements POOLED +public API broadcast network +P2P 'steem' feed
5. exchanges + coin-communities settlements POOLED +public API broadcast network +P2P 'steem' feed +arbitration board/commissions
*arbitration board/commissions MIGHT not be necessary, only open ledger of peers reading the record of the open web of trust, said arbitration board/commission just provides credit scores, but does not can not enforce settlement beyond bonds already held.