[taler-marketing] branch master updated: blockchain integration

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dold pushed a commit to branch master
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     new de5a660  blockchain integration
de5a660 is described below

commit de5a660dc7a48d4403d0c3c682704096f84dafe0
Author: Florian Dold <florian@dold.me>
AuthorDate: Sun Mar 5 19:04:31 2023 +0100

    blockchain integration
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 1 file changed, 29 insertions(+)

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+# Taler/Blockchain Synergies
+
+Two types of complementary Blockchain integration are possible:
+
+1. Blockchain as underlying account-based settlement layer (RTGS, wholesale 
CBDC)
+2. Blockchain as decentralized, durable, append-only data storage
+
+# Taler + RTGS Blockchain
+
+* Blockchain is used as the underlying account-based settlement layer
+ * Incoming transactions to exchange are monitored as part of issuing digital 
cash
+ * Outgoing payments are initiated by exchange to pay merchants/customers for 
deposited digital cash
+* Requires adapter that exposes HTTP/JSON interface to exchange (called a wire 
gateway)
+* Depolymerizer project implements this for ETH and BTC Blockchains
+
+Implementation estimates (person-days):
+* Subsequent integration w/ different Blockchain: 15-30
+
+# Taler + Data Storage Blockchain
+
+* Taler Exchange uses Blockchain as append-only database for crucial records
+  (coin invalidations, deposit confirmations, ...)
+* Architecture: Exchange has postgresql as caching layer, Blockchain as
+  source-of-truth. Two-way synchronization between Blockchain and Taler 
exchange
+* Can also be used to improve quantum resilience (c.f. Chaum)
+
+Implementation estimates (person-days):
+* Implementation with first Blockchain: 40-70
+* Subsequent integration w/ different Blockchain: 15-30

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