{
  "manageEntity": {
    "action": "Save",
    "entityId": "759867",
    "entityType": "Track",
    "nonce": "0x1ff301ca083757aa240d6c34ec575752e8eb5833b5c810c259e9ea25297f67d5",
    "signature": "0x53e3ab430362f27e0572664fc53efe5ae54a68d75ec83b6ff90a83d58e7e749a197c64e9e56fc872248a901c5905a21f3ffd2eac9bfcb172f587797906c83bd21b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}