{
  "manageEntity": {
    "action": "Save",
    "entityId": "337534649",
    "entityType": "Track",
    "nonce": "0x529ccc9366e86fe3f33ef78c8ac4115ec6c6db8b02f87d95e18b66a5289e0667",
    "signature": "0x3157012dc7c0b2d79ae9e3f76a756b0df809a74ec61ecf05aa4d7a30861c8c152589081d65c64ecdbc35f6f225cb7b43d348512706bb531513638485f02cb90b1b",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}