{
  "manageEntity": {
    "action": "Save",
    "entityId": "1573317509",
    "entityType": "Track",
    "nonce": "0xe343dd5daa1d06e42a6ba81990a54459b94144afc54c268cc895874693c30d49",
    "signature": "0x803655ae46d64b602683b62b9fe0d6283642045a334c1e16f3bc5137fbee479e0327c1ab0b0e31982bae37fdfa2ac2a8977fd973a47e990438655d98b52ddeb41b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}