{
  "manageEntity": {
    "action": "Save",
    "entityId": "971817",
    "entityType": "Track",
    "nonce": "0xf1fb740ce8bd1e612d5dd3b9530674b840a6f5bdf1bf9a83ef38fe2956cfd1cb",
    "signature": "0x55b0c8521011196041e29f4667efa85c5b748d037ce16d452c7e4651372c1f920efd013e9fbe3f1a4a544bc2e1b88123c0901ae4bbdb4ed17f9fda9645372ab41b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}