{
  "manageEntity": {
    "action": "Save",
    "entityId": "1457074717",
    "entityType": "Track",
    "nonce": "0xde0b0ca7e0f7a6df84217cdf30234955ab3cb9c5c17a27d5235ca985637aa47e",
    "signature": "0x851a1c543599d22c90baec09b8a61908f32f15345018522518ca7ace3c58d9a40911d58c17f2592c3c9527edfe9a35321ca77cf2eb87ad251ab6993de2ccfc541c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}