{
  "manageEntity": {
    "action": "Save",
    "entityId": "1669777345",
    "entityType": "Track",
    "nonce": "0xf0e096e779a2fa682f51552481783db47c38a84094dfd6b818b1b2ca4957d1dd",
    "signature": "0xff29ff8f678ca9dccefd5dfe59eb7def268b56ea3dc09e8d3c7f2641b88c170722d000da66173abc1147fcfe6eb5fab6ff6b033e2f3e69af83af60be8bab1ab61c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}