{
  "manageEntity": {
    "action": "Save",
    "entityId": "642654059",
    "entityType": "Track",
    "nonce": "0x43c19d75fcaa95876030a3981b930a0de03f63dc77f43762392096cab2da11bb",
    "signature": "0x81254d1d57b56817e03e67decad2069a2545a1ef6cc3d39c3b2df48083e6747a3c94a39bfcce39b2234f73e7642bc29c6d85be21abe9484e1f761a2c73b0edad1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}