{
  "manageEntity": {
    "action": "Save",
    "entityId": "454690",
    "entityType": "Track",
    "nonce": "0xde2acb5065bb9254d1f0a24afa11707b4dc2944f1dce8b7d9bacc2c1fa04e6bc",
    "signature": "0xa4e634e33d93e65ce1e133d6e1a707a4014f5db96e6cbde49860c59906478bcd00b065c1c6499caeb3af6969835f97ffcfa20040881cc9ed3037b29a76ea9d231b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}