{
  "manageEntity": {
    "action": "Save",
    "entityId": "540260",
    "entityType": "Track",
    "nonce": "0x037b382828191dc0f9a8ef73403ae6788dd8fe4ce9a3ee9e255e660676092474",
    "signature": "0xb26e21e124dc0604c1dde452e32f7d9a0afb15b7a9c28eac3f3e567c90fcf3413c3f584af9d28a4f67b4a536c787cda6322b0149be2f168341306411e24b37161b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}