{
  "manageEntity": {
    "action": "Save",
    "entityId": "1049602729",
    "entityType": "Track",
    "nonce": "0xc8508ef2e60420598cfecca8e13bec222991fedcdf19684bfb176f5eb8673ee9",
    "signature": "0xc0d15ea4e90686c51bf3d97e0bb05ef4b68650654b519eef4d745279660dad9c3a780d10e41da8e58a5e6c2153ff78b4ec1be16cfba96e1d427a2999a87020781b",
    "signer": "0xf39D3e3Ea8b52437CD50Aa1EE0BD56d4431FC6CD",
    "userId": "183245"
  }
}