{
  "manageEntity": {
    "action": "Save",
    "entityId": "485941",
    "entityType": "Track",
    "nonce": "0xd325da49aa7e8cd193bcd3ef86d10be9c3f778149782f13ef4c1f28a6c082a8b",
    "signature": "0x95146b01adfbef3c3529743718f15cd5c53b1d28f7c40b3a1d96674948b019af5a2613109db01ee3b10536877325e6fd074cb7d7d1d06038c1172a7b64911b1c1b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}