Change Details

Description of PR: > There is a common misconception that the block count returned by the blockchain rpcs includes the genesis block. > However, it really returns the height, which is 0 for the genesis block. > So clarify that and also remove the misleading "longest blockchain" comment. > Finally, fix the wallet test that incorrectly used this rpc. Backport of Core PR16325

Description of PR: > There is a common misconception that the block count returned by the blockchain rpcs includes the genesis block. > However, it really returns the height, which is 0 for the genesis block. > So clarify that and also remove the misleading "longest blockchain" comment. > Finally, fix the wallet test that incorrectly used this rpc. Backport of Core [[https://github.com/bitcoin/bitcoin/pull/16325 | PR16325]]

Description of PR: > There is a common misconception that the block count returned by the blockchain rpcs includes the genesis block. > However, it really returns the height, which is 0 for the genesis block. > So clarify that and also remove the misleading "longest blockchain" comment. > Finally, fix the wallet test that incorrectly used this rpc. Backport of Core [[https://github.com/bitcoin/bitcoin/pull/16325 | PR16325]]