{
  "manageEntity": {
    "action": "Save",
    "entityId": "509002",
    "entityType": "Track",
    "nonce": "0xfc5343d44e080da4b114ec3bc7495f545129e9def566a8c2c7e9ea5f5c1b2856",
    "signature": "0x25177be1700c9142e97f33182794382ed853d28e855cb0a111c1645068938cb2654942c5da61c49c345af19ea104d68351b170d3f4833929d266cd3887b5b1e61b",
    "signer": "0x0168976438910D2f5330323a0d0141Fb4Af95032",
    "userId": "317847"
  }
}