{
  "manageEntity": {
    "action": "Save",
    "entityId": "40449977",
    "entityType": "Track",
    "nonce": "0x3ad752012a4313320c1719fb00d26becee70493d6f62e47b3866b96d193eadd0",
    "signature": "0xde84744a15e95501384db736ab9c26f1947c4e752fa073fb60ca4596bc3d0fb166af717451b1ae06bd175fc4eb2accb96e51311f67aff2aff5947f06f4f745331c",
    "signer": "0xAaC77705f5f6bd787D8581c36Ddaf7c0c7AE3370",
    "userId": "827420993"
  }
}