{
  "manageEntity": {
    "action": "Save",
    "entityId": "1574385252",
    "entityType": "Track",
    "nonce": "0x413afd113c17b6e70d68dd185cb4dddadee1d9c7b1e267ac1cdef6e7b9a0e393",
    "signature": "0x75cca1bc1be1ccc3f1c28fdc44616419545bd42707da5b79ca74960a0bc4467f518000a7ababd38ae19f45a8da43fd09d9f2ebfce7cc5ceef730f1b2bd46a41c1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}