{
  "manageEntity": {
    "action": "Save",
    "entityId": "1886100026",
    "entityType": "Track",
    "nonce": "0x52efc2d89351b16a64c6918a1d292b48b2b4aaa80ed93b5a27cc0d473bb9a986",
    "signature": "0x951fca2e7f9ab369bdfd17be433bbc0b74b64b6706413a1607aa7d7f497a97633bd74bc5c8c272ec371c103403184159042b8416da3d194f1be897dfe9efe9461b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}