{
  "manageEntity": {
    "action": "Save",
    "entityId": "15841",
    "entityType": "Track",
    "nonce": "0x89d54f3dd679fa587a222858e61979afdb335f95cca3b79fa75c8e0b74dc9a4c",
    "signature": "0x36c98224eff7fd9926d6c69ee3a93be9f7af73946cd71927ee37b1ca8408fa28641b430a72fb0e107a7b9b0eca9febd1d5467cc73618be8cdce430626b7e81531b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}