{
  "manageEntity": {
    "action": "Save",
    "entityId": "665945568",
    "entityType": "Track",
    "nonce": "0x5cdb36628ac869062939e0dbfad63edb308af6c48bbdb88bf15f5afe4f7fc0de",
    "signature": "0xc7dd80aae80d2dcda096062c6001d5fd0db6f3def8ae5ecb8d10ec383d6907b67fdbc681f5ce3238cabf92eaab16cd33855af281b5bece9dce7212da8fc94dd11c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}