{
  "manageEntity": {
    "action": "Save",
    "entityId": "511978",
    "entityType": "Track",
    "nonce": "0xf555cc88aed5e4220c73deb03ed6821c0053f2028c32e79a38bb1dc6e631150f",
    "signature": "0x0e482b39b52ee6302636321052ea5595280423b79b171d6de18edc3f1af1acb15cda9ba847660dc3f2f5c3aaf498a6d57e63c7cb697ecc1b6687f28989b71c001c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}