{
  "manageEntity": {
    "action": "Save",
    "entityId": "742110617",
    "entityType": "Track",
    "nonce": "0x57c50e2ba03d8e67279345b09f49a6dad77b59ce7b5154da47ca01f7a2ae8181",
    "signature": "0xf6cd678316a6296dce04e7736f0ab4a5b8b6d5e08b01ff865d0b760e7f6094114e033c6e39c20927fffe384521d8504cbb8df334d44c8f4444be20e45443c2151b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}