{
  "manageEntity": {
    "action": "Save",
    "entityId": "536670",
    "entityType": "Track",
    "nonce": "0xd4d75b8d5a31a95e97a0aea3ccb1d943293ba1aa445f38af7252a5cefeac1ada",
    "signature": "0x993857b43cdfcae128c390be8dcf19520e814582d26325c534accf5c83a5d1f878b8a570d2ca8268616b113e10e431943d4fa84bf6e149b2fcce36524d423a151c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}