{
  "manageEntity": {
    "action": "Save",
    "entityId": "643956167",
    "entityType": "Track",
    "nonce": "0xec6d0a8b74c68a361d1526405ee4d85f2ba8d273c9a855a0a5c51c32569e4965",
    "signature": "0xfe375b87e62b370fa3c58d56632ba242b46a02a2d5bc38967efd76ddd22010f72dc6ac220d2c345c0b593a27704d86222945b2c6f7a9ce7ebdd06db5a9cfdb051b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}