{
  "manageEntity": {
    "action": "Save",
    "entityId": "257429",
    "entityType": "Track",
    "nonce": "0xceaac18790db6cd12a590e7c24ea295f713397db9f414745db7be811a8de1fdb",
    "signature": "0x28b3242293bd8f08dfe9bee4d54975881ff4599d1dfcadb7352348feca5b78c050528c817743d91dae774c99bc14a9d32fcb7865ddb23285e423209aec25d9801b",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}