{
  "manageEntity": {
    "action": "Save",
    "entityId": "1421618841",
    "entityType": "Track",
    "nonce": "0x9831f8ef1fe684fc2cf5cb865fc051fda9e1981c579a15918163cfdf8efc0ef0",
    "signature": "0x07ce56d484f5ad49afc33e0710a6d7b0595bb85d376d0307c4bb5eb051adcf8a0f3059d1f7447cfb6020914aa4a19049e6c33d8f2e8c11497c8af00647de5ee71c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}