{
  "manageEntity": {
    "action": "Save",
    "entityId": "754459507",
    "entityType": "Track",
    "nonce": "0xde7b13ad3bbc92fa20f054c17553a894dc77d21bfb519845e921055503570f1c",
    "signature": "0xf7703d89b4602b61daa58b36ab6183f6ea70f5a7d4f6f324e9fadd6d21a056104e71b37d5a7c65bf571ef30a6747feedffe661bac21baadfa9f325d23204ef531c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}