{
  "manageEntity": {
    "action": "Save",
    "entityId": "344829551",
    "entityType": "Track",
    "nonce": "0xc77f548efbe5e98654baa314d731b069ea6210701f6958fcdff7d1dc1d96dc80",
    "signature": "0xab1ce1f08f12613dc109ee6d2c08d7a834b582b3d325a059b933ab272f49987c5478e3f634ca965656a903977ec9610eab6d8612c1bedfd769dc6c71ca86d86d1b",
    "signer": "0x45c4f1dcE13eeF476C74C5758696D56137253980",
    "userId": "824478223"
  }
}