if you run commands inside a folder

/temp

it will be created a /temp/data/keypair inside.

if then you run in a diferent folder, a new keypair will be create, otherwise it will use the same.

so, be sure that you run the commands inside the same folder (/temp) to use the same wallet/account/keypair.

docker pull soldate/mbtc
docker run -it -p 10762:10762 -p 8080:8080 -v "${PWD}/data/keypair:/tmp/data/keypair" --rm soldate/mbtc

http://localhost:8080

http://localhost:8080/chain

height = 1055