{
  "manageEntity": {
    "action": "Save",
    "entityId": "173215203",
    "entityType": "Track",
    "nonce": "0xb76dd214dd3acd9febf163c7d50c3a8e5d9890c36742f157f723a1ddfb78c2a6",
    "signature": "0x67f30a3e87c67acffa6b8738d578ac92a45d470a016166145474406ee0d7904133e29192b3294e8d101387f295e964441dc52eeb005e1a2f2828b119f64930941c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}