{
  "manageEntity": {
    "action": "Save",
    "entityId": "1616544602",
    "entityType": "Track",
    "nonce": "0x9ab3ea2db7e3c3520ca2a01f498f78ba4c19dea99aba2328b2f780b6cf3c7d11",
    "signature": "0xce4038949b5e32a1fc5e4972de2e4bbd505426d6f55fda5ae481047a35c6555a0c452e299129033070e63ca3258d21ae6c70ce3d080cd81ea329b7118f1286431c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}