{
  "manageEntity": {
    "action": "Save",
    "entityId": "947915455",
    "entityType": "Track",
    "nonce": "0x777cc49385acc599ea3606563100550d19a6bb40a61f28f97a374cd8bd27f7d7",
    "signature": "0x6c64dfdccd9285348d306754377c28f18a193cc5190e8a14b010cc8713e075db1b4dc9309e707be1c27b1390874b6793c5e7693e92a7e679f23b3fa23f1680651c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}