diff --git a/content/notes/blockchain-project.md b/content/notes/blockchain-project.md
index f2fb4125c..a9b9ef6be 100644
--- a/content/notes/blockchain-project.md
+++ b/content/notes/blockchain-project.md
@@ -64,6 +64,7 @@ Blockchain technology falls into two distinct classes: open (permissionless) blo
 - https://www.r3.com/blog/how-public-permissioned-blockchains-are-not-an-oxymoron-2/
 - https://blog.dshr.org/2022/02/ee380-talk.html
 - https://ethereum.org/669c9e2e2027310b6b3cdce6e1c52962/Ethereum_Whitepaper_-_Buterin_2014.pdf
+- https://www.investopedia.com/terms/b/blockchainasaservice-baas.asp
 
 - https://en.wikipedia.org/wiki/Futarchy
 - https://pluralistic.net/2022/02/14/externalities/#dshr
diff --git a/content/notes/think-writing.md b/content/notes/think-writing.md
index 19b3fdfd2..369a28317 100644
--- a/content/notes/think-writing.md
+++ b/content/notes/think-writing.md
@@ -158,4 +158,12 @@ doi: 10.1109/TEM.2020.3003565: Permissionless and Permissioned, Technology-Focus
 	- hard: a complete separate copy of a blockchain
 - How will the blockchain be funded? Maybe I need to consider this.
 - Blockchain as a service?
+	- https://www.investopedia.com/terms/b/blockchainasaservice-baas.asp
+	- amazon managed blockchain
+	- microsoft ethereum blockchain-as-a-service
+	- r3
+	- paystand
+	- hyperledger cello
+	- [IBM Blockchain Platform](https://www.trustradius.com/products/ibm-blockchain-platform/reviews "IBM Blockchain Platform reviews."), [Oracle Blockchain Cloud](https://www.trustradius.com/products/oracle-blockchain-cloud/reviews "Oracle Blockchain Cloud reviews."), [Azure Blockchain Service](https://www.trustradius.com/products/azure-blockchain-service/reviews "Azure Blockchain Service reviews."), [Alchemy](https://www.trustradius.com/products/alchemy/reviews "Alchemy reviews."), [Infura Ethereum API](https://www.trustradius.com/products/infura-ethereum-api/reviews "Infura Ethereum API reviews."), [Kaleido](https://www.trustradius.com/products/kaleido/reviews "Kaleido reviews."), [Amazon Managed Blockchain](https://www.trustradius.com/products/amazon-managed-blockchain/reviews "Amazon Managed Blockchain reviews."), [Crypto APIs](https://www.trustradius.com/products/crypto-apis/reviews "Crypto APIs reviews."), [VMware Blockchain](https://www.trustradius.com/products/vmware-blockchain/reviews "VMware Blockchain reviews."), and [Cryptomat](https://www.trustradius.com/products/cryptomat/reviews "Cryptomat reviews.").
+- permissioned blockchain "connected" to permionless blockchain