{
  "manageEntity": {
    "action": "Save",
    "entityId": "1554868135",
    "entityType": "Track",
    "nonce": "0x8ffaf8f9dad80342fbd490a204fafed4daf492dad885ba4759ffadd9c634c9d2",
    "signature": "0x1f786527f1f629da6d575b754d697390ce4d4d5c56fb68bc24884bdfd13fd7797496e3bd7a7a07559709c75def98eccd5a1dd44e6b3c1c5892e39fa746decd8f1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}