{
  "manageEntity": {
    "action": "Save",
    "entityId": "719846",
    "entityType": "Track",
    "nonce": "0x9efbb403691d45bbd7741553fb6c20d3aa1b9829bd9a42f17ee49a7e5a6ef78e",
    "signature": "0xd80b2f49c363543daf2a6a23550bdb3aa9c77b0c1b105c069da260d6fe7c20b05c3f80e4e4b32fe0249f84d16d4684e363b4066babd819b77ed620b397971ef31b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}