{
  "manageEntity": {
    "action": "Save",
    "entityId": "486445321",
    "entityType": "Track",
    "nonce": "0x5d3464f1445bade45e5a1d8b5101271e60185aceb887d549c3a1c8e2786c9a48",
    "signature": "0xaef21c85e23c26e0ea73d72974ef0d2e357abbb6d53b99ce49bcff10c8515fc8735fff2b90c7fd308a58654073c656deae571a1a0d6719548d703dfdc3878f241b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}