{
  "manageEntity": {
    "action": "Save",
    "entityId": "408183",
    "entityType": "Track",
    "nonce": "0xfd3d573028741c747178f664c5b9672083c7014e1bd062c1aaff0139434a0a5c",
    "signature": "0x974147e9472985d5a6389cc81f09b1073bd10ae63a322e9cb3d9d2f5ef6eabbc2689ed4f98db947f77ae0fe72cc7578925a0fb32fc1583ced5fb1137b3077e331b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}