{
  "manageEntity": {
    "action": "Save",
    "entityId": "1740393413",
    "entityType": "Track",
    "nonce": "0xa5a7d7a9f997b9fc1fab5bed5ef80fba5e38f817e1ad2e6d5be9e08bebc23c1b",
    "signature": "0xbac10cb5c463b0ebf8677dcf2210d3e8f84ff2951724443e047d2577a45ce198672f409254e20eea5802982b6134f361444b977a7c103fb962dfee600add448b1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}