{
  "manageEntity": {
    "action": "Save",
    "entityId": "689487925",
    "entityType": "Track",
    "nonce": "0x5b0efce76de59389af442570e1aae9ea0cbb70289377a7288222984ad60e7c37",
    "signature": "0x6705b88c2652c617c497e583fc75f40ba2bb3f4263fbba4f84805359bcd330214c1240c4bd49788ed1037864e65de658503f5586b95b8511d13554b54bff28ee1c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}