{
  "manageEntity": {
    "action": "Save",
    "entityId": "1688706919",
    "entityType": "Track",
    "nonce": "0x9319ae566c5551f2f1c287f524a088367d7f7ff4172a3aa2361b2a9401b99b80",
    "signature": "0x8813923b179fb723cb99c8e62d2a1731a44098378dabfed1f003870c17423c330b5bcc195a13614e92ff72015892b16fd4eafe0508f0c8e328540247aa6d40931b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}