{
  "manageEntity": {
    "action": "Save",
    "entityId": "1938492456",
    "entityType": "Track",
    "nonce": "0x402ba36eca5d80c1fea5b829c57beecea8afa726090a4a22bf76e827314a287b",
    "signature": "0x9ef294a55ce6499592456b4cdb1ec932bae158101fdc366c85914c46f076fb5a0062ddbe98c21220029da8c55cffdb24e9cea83375fe70aa6f4afd6403b2bc701b",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}