{
  "manageEntity": {
    "action": "Save",
    "entityId": "370500",
    "entityType": "Track",
    "nonce": "0x38d7cd0157fc4f214ec10be5e7bc2479709d2c0483017b7af49ca110e2eff04a",
    "signature": "0x5098ee6a7dd787befc0e1ac5a9e8830b78c382b96b176b8bcb4e11e5792b5016351befe6a9367fa1a10167a953e6346a61f7eaa039097dd00703dd39297a240a1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}