{
  "manageEntity": {
    "action": "Save",
    "entityId": "751208518",
    "entityType": "Track",
    "nonce": "0xc930565946af7fdf42db01c3529a695075741b630a966379a8d17fff9659aeb3",
    "signature": "0x8a29241ebdc05635de705bafe3c3cfc9f4657a590062524219b33dd2b35df226239d8ca1c54a5537d0f45295d206d3f1966d6ace4830ff8c73bb300a955a1fb11b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}