{
  "manageEntity": {
    "action": "Save",
    "entityId": "700069123",
    "entityType": "Track",
    "nonce": "0xe88cc2c635062b7735418bccfff1f2a9b50fbf20c4737bc3f21bf925fc4ff3e1",
    "signature": "0x56dc860cebffd5fb55965f62bfcb4f868e0fac75706586665066338b2a58cf470711ec302d0ef131a28c8a8ec0a43e121be4c52c2c9b145bff75a3b59b0828971c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}