try not to re-validate txns in blocks that we've signed

[evanmcc]

No description provided.

[codecov]

Codecov Report

Merging #337 into master will decrease coverage by 3.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #337      +/-   ##
==========================================
- Coverage   68.31%   65.28%   -3.03%     
==========================================
  Files          67       67              
  Lines        6518     6534      +16     
==========================================
- Hits         4453     4266     -187     
- Misses       2065     2268     +203

Impacted Files	Coverage Δ
src/blockchain.erl	68.17% <100%> (+0.76%)	⬆️
.../transactions/v1/blockchain_txn_redeem_htlc_v1.erl	38.46% <0%> (-41.54%)	⬇️
.../transactions/v1/blockchain_txn_poc_request_v1.erl	56.16% <0%> (-26.03%)	⬇️
...nsactions/v1/blockchain_txn_assert_location_v1.erl	67.78% <0%> (-22.82%)	⬇️
src/transactions/v1/blockchain_txn_routing_v1.erl	65.85% <0%> (-21.96%)	⬇️
...actions/v1/blockchain_txn_security_exchange_v1.erl	65% <0%> (-21.67%)	⬇️
.../transactions/v1/blockchain_txn_add_gateway_v1.erl	71.18% <0%> (-19.5%)	⬇️
src/transactions/v1/blockchain_txn_oui_v1.erl	69.49% <0%> (-19.5%)	⬇️
.../transactions/v1/blockchain_txn_create_htlc_v1.erl	66.19% <0%> (-18.31%)	⬇️
...c/transactions/v1/blockchain_txn_token_burn_v1.erl	72.13% <0%> (-16.4%)	⬇️
... and 6 more

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