{
  "manageEntity": {
    "action": "Save",
    "entityId": "1644130886",
    "entityType": "Track",
    "nonce": "0x00cd0903fa0f15f3e65e8a8d28fb25a250e87af7fbc31c6ec66e13f5208ac9b9",
    "signature": "0x74a91a8f5403d48d9256e80cf7049cc10883f7c9161af61f8f9e1c00a275d9112038918df151a518248a5a0dd1ac483021dd6f0b664ebaa683c7a324bc6f66a31b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}