refactor: using the hathor prefix on verifyMessage

[andreabadesso]

Acceptance Criteria

• After feat: sign message hathor-wallet-lib#546 is merged, we need to expect the new message prefix on the wallet-service to verify signatures

Security Checklist

• Make sure you do not include new dependencies in the project unless strictly necessary and do not include dev-dependencies as production ones. More dependencies increase the possibility of one of them being hijacked and affecting us.

[codecov]

Codecov Report

Merging #426 (b2b2c80) into master (a3a71a4) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #426   +/-   ##
=======================================
  Coverage   95.60%   95.60%           
=======================================
  Files          40       40           
  Lines        2458     2458           
  Branches      278      278           
=======================================
  Hits         2350     2350           
  Misses        108      108           

Impacted Files	Coverage Δ
src/utils.ts	94.17% <100.00%> (ø)

[r4mmer]

Since we're using bitcoinjs for verification, do we need this?

[andreabadesso]

Since the lib is using bitcore-lib, I thought it would be a good idea to also use bitcore-lib to generate the mesages