{
  "manageEntity": {
    "action": "Save",
    "entityId": "1040800705",
    "entityType": "Track",
    "nonce": "0x421718d917c1023676106b16556c317748f4f02046b6e9f6fd5f5eafd70f64f0",
    "signature": "0x4b09f37fb5e12d9a2e0dd52a420b04c98e65bf9ad2f7767ee7ceb17d2cc878697dee5e590e07007a7564619ea4d3edd8e68f1cc5e1741236fe26c91ab1ba0bd21b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}