{
  "manageEntity": {
    "action": "Save",
    "entityId": "297910823",
    "entityType": "Track",
    "nonce": "0x0bf2a179ec3c7fd6113edd407ae0901b2f3354d829bb27664c6d73e529e3aab5",
    "signature": "0xbbb5689e4fe08fd49c067d6faaca192d25c783d0b630a241e7d57828bc969f07257da5837b52e0e18dfed7eb35f6d538292181d096dcd8326d3ca7800116d1681b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}