{
  "manageEntity": {
    "action": "Save",
    "entityId": "788575754",
    "entityType": "Track",
    "nonce": "0x6e10eceff4930c29431d8f31c7285837f14c8733004e099989c2bc9de4a4647d",
    "signature": "0x4174cffb4c48e4defbfb6255238de7383e9a8782968dc7d78e6dfa80b0d45ff40e6355f32f7133b1a6ec102df4ccc8399b3c3057c2c7b8a71af1e2be23aa0bcb1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}