{
  "manageEntity": {
    "action": "Save",
    "entityId": "1940654553",
    "entityType": "Track",
    "nonce": "0x21b4f199c2dc5e50f8d86e97747e0b09a1744dab6d5d5805a8bb448dc03f9008",
    "signature": "0x991a63169d0daf7b5f2b33daeb5c7bb3aaa31911c640e22b3f4fd671e1376a31674df0e1d5824c0b8feb495d5ad176439be8dbe5cb0bcc2a79b0b9e5eead9fbf1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}