{
  "manageEntity": {
    "action": "Save",
    "entityId": "1343214521",
    "entityType": "Track",
    "nonce": "0x9ec3bceea4366dd8c9262742d322e1d1b5b060873cfe0583da084b688693fd40",
    "signature": "0xa7567b8c6537d81792ed9984613e122e3b9d55f917ec83e1c185100e80aa724740d70b6b892cd6c7ffdc79e887cf3ba38ebb82cc6044353a88a0d4a9bfb0c1fc1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}