{
  "manageEntity": {
    "action": "Save",
    "entityId": "475238587",
    "entityType": "Track",
    "nonce": "0x48b72b5496ee618f703058f607c768c57fa35b837ac33121e0b1fa065757ecfc",
    "signature": "0xd87fa042ef8fdbcbce2b728b19005d822802a5992081c6501b35452786a4e3b5155a93eba581439278533c18e7809f47721218ea56be1a487d986b733e2f3c321c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}