{
  "manageEntity": {
    "action": "Save",
    "entityId": "447258199",
    "entityType": "Track",
    "nonce": "0xf41d1d920ae6013f2c99e80edb08961d44f2b0aa64a8f5dc64632fb6a3c83bea",
    "signature": "0x9323fd3e0f44eddb63888e670656cf6c8198d2dfc0467d5ede88bdbb493cf68816f5cec430e2a60405fce3649b8e69f3a04e8220b85448f55dea5bc41841cde71b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}