{
  "manageEntity": {
    "action": "Save",
    "entityId": "1848435441",
    "entityType": "Track",
    "nonce": "0x108eb969643223b7a397281446e5944a2e66c56be5116e2e2a893d059ffcd949",
    "signature": "0x522fcaf3c0caa1ae996b6525e01ae2632113dd17af8b4eb8d03491b5db2046463d8150d63dab653676fb72ba2a24090fae55298ec58b07ebb537d31e74f425ea1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}