{
  "manageEntity": {
    "action": "Save",
    "entityId": "770612142",
    "entityType": "Track",
    "nonce": "0x0f02ce8278d827059f0ffc876f35053211d6a62c4e2e88cf5bb43957f7e6b703",
    "signature": "0xa164aa515c58dfd7df1ef114b722761d1926c0a766c83f090d966856e4df10097e8359ba460292e35b79279a7c99979993aae6f949aedd74c1c0b7edc7feeb971b",
    "signer": "0x53d8e61f7BdCd69E26B5AAe8F197464091224DB4",
    "userId": "99786"
  }
}