{
  "manageEntity": {
    "action": "Save",
    "entityId": "549054748",
    "entityType": "Track",
    "nonce": "0xb1806375e62ae2dd7b31e1c32f3528145d7a592b658b3f6b5ccd7606e8f58b2a",
    "signature": "0xb77d97583f71b072f5010711e11c799f6d17076af1f9c4a35f128feb444cacf033657f52f33ec6f613a11eb346cc20d6c81484acc266cd460df461f7f2fcbe1b1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}