Add /hdc/transactions/sender/[PGP_FINGERPRINT]
Add /hdc/transactions/sender/[PGP_FINGERPRINT]/issuance
Add /hdc/transactions/sender/[PGP_FINGERPRINT]/dividend
Add /hdc/transactions/sender/[PGP_FINGERPRINT]/fusion
Add /hdc/transactions/sender/[PGP_FINGERPRINT]/transfert
Add /hdc/transactions/recipient/[PGP_FINGERPRINT]
Better merkle leaf finders