{
  "manageEntity": {
    "action": "Save",
    "entityId": "486528654",
    "entityType": "Track",
    "nonce": "0x38a27b0c9442c487ffd28d3053b91d5d7064a66f8c0ea37e0463767dad2305b8",
    "signature": "0x117991c7817603897a1c8948c01c1145095c3caa33b674b777b9559e1c24427c634c1c86485ad19ab12ca54b2a2fbb631e29d975e7951aafdaeb853c2dd2ce541c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}