{
  "manageEntity": {
    "action": "Save",
    "entityId": "1689202897",
    "entityType": "Track",
    "nonce": "0xe3b17658c2d2889d4333c737ea7278704f2e4e17c25075f8222b5df544c9c408",
    "signature": "0xd5b13493fcfd20e45b3249ff62606ca8b9b0bb22d0a004e25f1357ef003dab6a06c90049eecca17cebb2d5758595497d4669622300d4a0bdbdfd300a8cba2dc01c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}