{
  "manageEntity": {
    "action": "Save",
    "entityId": "900690254",
    "entityType": "Track",
    "nonce": "0x73c39914fb6ce090a7cc623d76a93653477b423a974a2d342605bf6dc1cf0cad",
    "signature": "0xb6e2fcb792af749cbdce437af39f4ea3668fa6bbeb59a5485857ecae6fc76c831fb592a4a4dbf396c44a1c65cd35f3ce9ff4dc2d3640acca705a3adf1502bf9a1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}