{
  "manageEntity": {
    "action": "Save",
    "entityId": "1937483553",
    "entityType": "Track",
    "nonce": "0xd746011b7d353bc6a9c03d7ddea602695ab59a97419ab618ecee7f0cc3a1c6db",
    "signature": "0x61f7d914e56cab23f03fe413a4c3b96691b580aead1f2d12267913b306fe228b04d23c7c8c8048efd488bbf2e681c5c32bc07ec03406f29f563394165c74f9e21b",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}