{
  "manageEntity": {
    "action": "Save",
    "entityId": "621238",
    "entityType": "Track",
    "nonce": "0x892ed837a3472bc273e2e6eecbd26e8eb45d9ae9b5d1a33e90303351a18ba586",
    "signature": "0x549625c7a65fc53a72af722fb62b123b296f353080640d04ddb54fdc16da33715c836984a2fdb6e270e647a71002186a9d4c8d526f047571697380479f6df0871c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}