{
  "manageEntity": {
    "action": "Save",
    "entityId": "257694813",
    "entityType": "Track",
    "nonce": "0x3e69d23d962e69567a4a8f9a24f3d48482418cf81715b810ee444ac76e5135cf",
    "signature": "0xcb795a577f10c1149a224c4117d8f283608018416af67c69c5a71b68d65fa47d58faf577814db50e8387cdc1791c9b0e85d6d6fd4540b24dc7abc2a576a6ac8a1b",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}