{
  "manageEntity": {
    "action": "Save",
    "entityId": "1537255938",
    "entityType": "Track",
    "nonce": "0x86e7819022ee7b7d3082f3e4143d6347de7c1cd4e20681e5e4dd288cf67e0fdc",
    "signature": "0xafdb5bd8a31bc51b2abb073214d2627e06c15d207ad8cc757979abe74f14c91646f9fc1595f1bd17b56c1add0d4897ac7d1669aba4330a55310eaeef7ed5af4d1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}