{
  "manageEntity": {
    "action": "Save",
    "entityId": "457219352",
    "entityType": "Track",
    "nonce": "0x04725c113a099751f19102e4bb4e1000a2c4472eeb8a6fb7910e26ea77d6b225",
    "signature": "0x7fcda417f68ae442b77aa42328f9485d850fe0ff4dc8273a7e815222956219d83cc44b25a0d853fb9f5fa4409393f392068474147e7a63706d5b498e4450a9781c",
    "signer": "0x37C656432bDD87630C13F60036e9857B5ee36154",
    "userId": "288167767"
  }
}