{
  "manageEntity": {
    "action": "Save",
    "entityId": "740846241",
    "entityType": "Track",
    "nonce": "0x1c7a118d7c32c5a146e3a18a6545ad28618060e5767d755c107b976f05fd6d5e",
    "signature": "0x8eb39f3a1d32eae9bffccde5b5256acd0e03bc8c1052c146f26b556fbdfaa1f34a57a1deb6fff8182aea18e67ea8fced5fda1f87268fb7d83124cbba7e46f5a31c",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}