{
  "manageEntity": {
    "action": "Save",
    "entityId": "1684766280",
    "entityType": "Track",
    "nonce": "0x42d9841577fb26cc01e90645a1e502ae144be5e2fb9e4eda664a6250637a6f7f",
    "signature": "0x84db2776514e15572c6a29bc83aee5171fad3074d23e4a4751e139cac522f75f17e8762b376450955142f589475bb0cd9013bf4e7a7f7ec61a57bd1547c694f21b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}