{
  "manageEntity": {
    "action": "Save",
    "entityId": "1896389841",
    "entityType": "Track",
    "nonce": "0x1d405cef2fb12bc75e788757bd1b5b70ec1f48b413712519b769e43d961f86fb",
    "signature": "0xbb1955735c9c380dc4745aa9a1d650753723d903ebf5b0b12d30d65a16ae82e25baa21400016adf1e891215fb3dd02556337031ede563611d444b493826bb5e91c",
    "signer": "0x5b1BC6b15bFD49D3991AD6E84621e7f0FBF2a77e",
    "userId": "548409021"
  }
}