{
  "manageEntity": {
    "action": "Save",
    "entityId": "402473953",
    "entityType": "Track",
    "nonce": "0x7c27b9ea72e8c68598e94c1650f7baacd3975872665c61100ff5e1882fa392a2",
    "signature": "0x5662409c8fc411e64486b74df116c9547301a37bc0cc62c3a0af9f0d3465befa21c267b67d9176eb3d88695491a60e253e66bd157b09fc4520c21ce5969d1b021b",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}