{
  "manageEntity": {
    "action": "Save",
    "entityId": "275366",
    "entityType": "Track",
    "nonce": "0xd7475a1ab1afd588fabc296b43658e1a13be961b763a7a20c62753c6bd525e18",
    "signature": "0x9f749dd63a2d13177854e3661528e6555408f7b0cd5ed9dc7ef047d99266805440f93141f52d8bae0812ac8c2862f718e3f6fb2b12949f7a2d480a115b19b8391c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}