{
  "manageEntity": {
    "action": "Save",
    "entityId": "421384",
    "entityType": "Track",
    "nonce": "0x1e3bca06a1efef9aba8d2635d8be3de91604af871ec124cdfc3648da810cb559",
    "signature": "0xb924da0e5aa4e3dfdd7ede82e9437a1b763aac533afb76646f32c404638c93a74e5c3579865bb7a6b201f08969034abdedde0acf4e2ef4dab7d60d054cfcbc021c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}